Tag Archives: form 3 end term 2 exams 2021

Teachers' Resources

MATHEMATIC FORM 3 END TERM EXAMS PLUS ANSWERS

ULTIMATE ACHIEVERS ACADEMY

Name: ………………………………………………………….. …Date: ……………Adm No: …………

FORM THREE

TIME: 2 HOURS 30 MINUTES

MATHEMATICS

INSTRUCTIONS TO CANDIDATES

  1. Write your name, class and Admission Number in the spaces provided above.
  2. The paper consists of two sections. Section I and Section II.
  3. Answer ALL the questions in Section I.
  4. Answer only five questions only in Section II.
  5. All answers and working must be written on the question paper in the spaces provided below each question.
  6. Marks may be given for correct working even if the answer is wrong.
  7. Negligence and slovenly work will be penalized
  8. Non programmable silent electronic calculator and KNEC Mathematical tables may be used except where stated otherwise.

FOR EXAMINER’S USE ONLY

Section I

Question 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 TOTAL
Marks                                  

Section II

Question 17 18 19 20 21 22 23 24 TOTAL
Marks                  
 

GRAND TOTAL

 

SECTION I (50 Marks)

Answer all the questions in this section.

  1. Evaluate                                                                       (3 marks)

 

  1. By correcting each number to one significant figure, approximate the value of

(788 X 0.006).

Hence calculate the percentage error arising from this approximation              (3 marks)

 

 

 

 

 

  1. Three bells ring at intervals of 9 minutes, 15 minutes and 21 minutes. The bells will next ring together at 11.00pm. Find the time the bells had last rang together. (3 marks)

 

 

 

  1. Solve for x in the equation below (4 marks)

 

 

 

 

 

  1. Without using mathematical tables or calculator evaluate (3 marks)

 

 

 

 

 

 

 

  1. Simplify (3 marks)

 

 

  1. The figure below shoes two intersecting chords

Find the length of UT                                                                                    (4 marks)

 

 

 

 

 

  1. Make h the subject of the formula (3 marks)

 

 

 

 

  1. Determine the integral values of which satisfy the inequalities below.(3 marks)

 

 

  1. Kambo bought a suit for Sh. 1200 and marked it at a price such that after allowing his customer a 10% discount, he would make a profit of 20%. Calculate the marked price of the suit. (3 marks)

 

 

 

 

 

 

  1. Given that , without using mathematical table, express in fraction form the value of;
  • (1 mark)

 

 

  • (2 marks)

 

 

 

 

  1. Given that evaluate (3 marks)

 

 

 

  1. On a certain map an estate is represented by an area of 48cm2. If the actual area of the estate is 1200 hectares, find the scale of the map in the form 1:n (3 marks)

 

 

 

  1. In the figure below ABCD is a rhombus whose diagonals AC and BD meet at X. Given that AC = 27.6cm and BD = 16.2 cm, calculate the area of the rhombus. (3 marks)

 

 

 

  1. The image of point (6, 4) is (3, 4) under a translation. Find the translation vector. (3 marks)

 

 

 

 

 

  1. The initial cost of a ranch is sh. 5 000 000. At the end of three years the value of the ranch increases to 5 306 040. Calculate to one significant figure the value at which the ranch appreciates. (3 marks)

 

 

SECTION II (50 MARKS)

Answer any FIVE Questions ONLY from this section

  1. Two shopkeepers Juma and Wanjiku bought some items from a wholesaler. Juma bought 18 loaves of bread, 40 packets of milk and 5 bars of soap while Wanjiku bought 15 loaves of bread, 30 packets of milk and 6 bars of soap. He prices of a loaf of bread, a packet of milk and a bar of soap were Ksh 45, Ksh 50 and Ksh 150 respectively.
  • Represent:
  • The number of items bought by Juma and Wanjiku using a matrix  (1 mark)

 

 

 

  • The prices of items bought using matrix                                          (2 marks)

 

 

 

  • Use the matrices in (a) above to determine the total expenditure incurred by each person and hence the difference in their expenditure.           (3 marks)

 

 

 

 

 

 

  • Juma and Wanjiku also bought rice and sugar. Juma bought 36kg of rice and 23kg of sugar and paid Kshs 8160. Wanjiku bought 50kg 0f rice and 32 kg of sugar and paid Kshs 11340. Use the matrix method to determine the price of one kilogram of rice and one kilogram of sugar.                                         (5 marks)

 

 

 

 

  1. The diagram below represents a steel girder used in construction work. The cross – section consists of a rectangle measuring 20cm by 14cm from which two similar semi – circles have been removed. The girder is 5m long and is made of steel whose density is 8.5g/cm3.
  • Calculate:
  • The cross – sectional area of the girder. (3 marks

 

 

 

 

 

  • The mass of the girder in kilograms. (4 marks)

 

 

 

 

 

 

  • The removed semi – circular troughs are filled with concrete whose density is 5.5g/cm3. Calculate the mass of concrete used to fill the removed parts of the girder. (3 marks)

(Take π = )

 

 

 

 

  1. A country bus left town A at 11.45am and travelled towards town Bat an average speed of 60km/hr. A matatu left town B at 1.15pm on the same day and travelled along the same road at an average speed of 90km/hr. The distance between the two towns is 540km.

Determine:

  • The time of the dsy when the two vehicles met.           (4 marks)

 

 

 

 

  • How far from town A they met. (2 marks

 

 

 

 

 

  • How far outside town B the bus was when the matatu reached town A, (4 marks)

 

 

 

 

 

 

 

 

 

  1. Two lines L1 whose equation is and L2 whose equation is intersect at point A.
  • Find the coordinates of point A. (3 marks)

 

 

 

 

 

 

  • A third line L3 is perpendicular to L2 at point A. find the equation of L3 in the form , where area constants.(3 marks)

 

 

 

 

 

 

 

 

  • Another line L4 is parallel to L1 and passes through. Find x and y intercepts of line L4. (4 marks)

 

 

 

 

 

 

 

 

 

  1. In June of a certainyear, an employee’s basic salary was Ksh 17 000. The employee was also paid a house allowance of Ksh 6 000, a commuter allowance of Ksh 2 500 and a medical allowance of Ksh 1 800. In July that year, the employee’s basic salary was raised by 2%.
  • Calculate the employee’s:
  • Basic salary in July.                    (2 marks)

 

 

 

  • Total taxable in the July of that year (2 marks)

 

 

 

  • In that year, the taxable income tax rates were as shown in the table below.
Monthly taxable income (Kshs) Percentage rate of tax per shilling
Up to 9680

From 9681 to 18 800

From 18 801 to 27 920

From 27 921 to 37 040

From 37 041 and above

 10%

15%

20%

25%

30%

Given that the monthly personal relief was Ksh 1056, calculate the net tax paid by the employee.                                                                             (6 marks)

 

 

 

 

 

 

 

 

  1. In the triangle XYZ below line XY = 3cm, YZ = 4cm and XZ = 3.5 cm.

Calculate:

  • Angle ZXY (4 marks)

 

 

 

 

 

  • Angle XYZ (2 marks)

 

 

 

 

 

  • Angle XZY (1 mark)

 

 

 

  • Calculate the area of the triangle XYZ to four significant figures. (3 marks)

 

 

  1. The 2nd and the 5th terms of an arithmetic progression are 8 and 17 respectively. The 2nd, the 10th and the 42nd terms of the arithmetic progression form the first three terms of a geometric progression. Find:
  • The first term and the common difference of the arithmetic progression. (3 marks)

 

 

 

 

 

 

 

 

 

  • The first three terms of the geometric progression and the 5th term of the geometric progression. (4 marks)

 

 

 

 

 

 

 

 

 

 

  • The sum of the first 4 terms of the geometric progression. (3 marks)

 

 

 

 

  1. By taking integral values of x, from x = – 2, to x=6 make a table of values for the function                                                                                                 (2marks)

 

 

 

  • On the same axes and using the scale of 1cm to 1 unit on the x-axis and 1cm to 5 units on the y–axis draw graphs of and (4marks)

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

  • From your graph;
  • Find the roots of the equations (1mark)

 

 

 

 

  • Write down the maximum value of (1mark)

 

 

 

 

 

  • Deduce the roots of the equation (2marks)

 

MATHEMATICS Form 3

MARKING SCHEME

SECTION I

NO WORKING MARKS GUIDELINES
1.      

M1

 

M1

 

 

A1

  
    03  
2.       M1

 

M1

 

A1

  
    03  
3.    
3 21 15 9
3 7 5 3
5 7 5 1
7 7 1 1
  1 1 1

 

  

M1

 

 

M1

 

A1

  
    04  
4.      thus

thus

 M1

 

 

 

 

 

 

 

 

M1

 

 

A1

  
    03  
5.      

M1

 

M1

 

A1

  
    03  
6.   M1

 

 

 

 

 

 

M1

 

 

A1

  
    3  
7.     Ignoring negative answer  

M1

 

 

M1

 

 

 

 

 

 

 

A1

  
    03  
8.      

M1

 

 

M1

 

 

A1

  
    03  
9.      

 

Integral values

  

 

M1

 

 

 

 

M1

 

A1

  
    03  
10.         M1

 

M1

 

A1

  
    03  
11.         (a)

(b)

  

 

 

 

 

 

M1

 

A1

 

A1

  
    03  
12.         Numerator:

Denominator

 M1

 

 

M1

 

A1

  
    03  
13.         M1

 

M1

A1

  
    03  
14.         M1M1

 

A1

  
    03  
15.         M1

M1

 

A1

  
    03  
16.          

M1

 

 

 

 

 

M1

 

 

A1

  
    03  

SECTION II

NO WORKING MARKS GUIDELINES
17.         (a)  (i)

 

(ii)

 

 

(b)

 

Juma = sh 3560

Wanjiku = sh 3075

 

Difference = 3560 – 3075 = 485

 

 

(c)

 

 

 

 

 

 

 

 B1

 

 

B1

 

 

 

M1

 

 

M1

 

A1

 

 

M1

 

 

M1

 

M1

 

 

 

 

M1

 

 

 

 

 

A1

 

  

 

 

 

 

 

 

 

 

 

For both answers
    10  
18.         (a)  (i)

 

 

 

(ii)

 

 

 

(b) 

 

 

 M1

 

M1

 

 

A1

 

 

M1

M1

 

M1

A1

 

 

M1

 

 

M1

 

A1

  
    10  
19.       (a)  Time before the matatu started

= 13.15 – 11.45 =

Distance covered by the bus =

Distance between them =

Relative speed =

Time taken to meet =

Time they met = 1.15pm + 3 hours = 4.15pm

 

(b)  Distance from town A to the point of meeting

Time =

Distance from A =

 

(c)  Time taken by the matatu from B to A

The matatu reaches A = 13.15pm +6hrs = 1915hrs

Time travelled by the bus when the matatu reaches A

1915hrs – 1145hrs =

Distance moved by bus from A =

Distance outside town B

  

 

M1

 

M1

 

M1

A1

 

 

 

M1

A1

 

M1

 

 

M1

 

M1

A1

  
    10  
20.         (a) 

 

Solving simultaneously

 

 

(b)

, (x ,y)

 

(c) 

 

 

 M1

 

 

 

M1

 

 

A1

 

 

 

 

M1

 

M1

 

A1

 

 

 

M1

 

 

 

M1

 

A1

 

A1

  
    10  
21.         (a)  (i)

 

(ii)

 

(b) 

 

Total tax      =  4104

 

Net tax =

= 3048

 M1

A1

 

M1

A1

 

 

M1

 

M1

 

M1

 

M1

 

M1

A1

  
    10  
22.         (a)

 

(b)

 

(c)

 

(d)

M1

 

M1

 

M1

A1

 

 

M1

 

 

 

 

 

A1

 

 

A1

 

 

M1

M1

A1

  
    10  
23.         (a)      

 

 

(b)      

Geometric progression

 

 

 

(c)      

 

 

 

 M1

 

 

 

M1

 

 

 

A1

 

 

 

 

 

 

B1

B1

B1

 

B1

 

 

 

 

 

 

M1

 

M1

 

 

A1

  
    10  
24.          
x -2 -1 0 1 2 3 4 5 6
12x -24 -12 0 12 24 36 48 60 72
-3x2 -12 -3 0 -3 -12 -27 -48 -75 -108
y -36 -15 0 9 12 9 0 -15 -36

                                                                        2 mks for correct table

y = 5 ( x – 2 )

y = 5 x – 10

x 0 2 5
y -10 0 15

 

i) roots of 3 x ( 4 – x) = ) are x = 0, x = 4

 

ii) Maximum value of y = 3x ( 4 – x )         when x = 2 , y = 12

the maximum value of y = 12

 

iii)   roots of equation 3x ( 4 – x ) = 5 ( x – 2 )  is where the curve cuts the line

y    = 5 (x -2 )

The roots arc x = -1  and x = 3.3 ± 0.1

 

 B1

B1

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

S1

P1

C1

L1

 

 

 

 

 

 

 

 

 

 

B1

 

B1

 

 

 

B1B1

 Table

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

üB1 for both values of x
    10  

 

Teachers' Resources

ENGLISH FORM 3 END TERM EXAMS PLUS ANSWERS FREE

ULTIMATE ACHIEVERS ACADEMY

Name____________________________________Class_______________AdmNo:_____________

Date__________________________________________Sign______________

 END TERM EXAMS

FORM THREE

ENGLISH PAPER 1

TIME: 2 HOURS

INSTRUCTIONS:

a). Write your name, class and Admission number in the spaces provided above.

b).Answer all the questions

c). All answers must be written in the space provided in this booklet.

1.FUNCTIONAL WRITING                                                                                                20MKS

You recently returned from your mid- term break to learn that you close friend has lost her mother through a tragic road accident.

  • Write a condolence letter to your friend.(12marks)

………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………

………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………

………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………

………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………

  • Write a note to remind your classmates of the ongoing funeral arrangements, the need to contribute money for the burial arrangements, the amount to be contributed, who to receive the contributions and the date for the burial                  (08 marks)

………………………………………………………………………………………………………………

………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………

………………………………………………………………………………………………………………………………………………………………………………………………………………………………

 

  1. Read the passage below and fil in the blank spaces with the appropriate word.

The generation gap between my parents and …………………….keeps widening. For one, …………………… I work hard to keep B average in school, my parents think I would have an A if I worked ………………………. Then they insist on me joining the basket ball ……………….; but after school, I would rather use my spare time reading ‘Mills and Boon. They have ……………….. a career for me. They would like to become a lawyer ………I would rather study music. At home, during holidays, I like wearing comfortable clothes like ‘hipsters’ and ‘tumbo –cuts,’ but they think ……………… clothes are indecent. They say the tummy …………………..be covered and the trousers should ……………………be tight. We all do not know where this generation gap is coming to ……………time will tell.

 

  1. ORAL SKILLS       (10MKS)
  • (a) Read the poem and answer the questions that follow.

I see his blood upon the rose

And in the stars the glory of his eyes

His body gleams a mid external snows

His tears fall from the skies

I see his face in every flower

The thunder, and the singing of birds,

Are but his voice – and carven by his power

Rocks are his written words.

 

All pathways by his feet are worn,

His strong heart stirs the ever beating sea

His crown of thorns is twined with every thorn,

His cross is every tree.

  • Describe the rhyme scheme of the poem above. (2mks)

………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………

  • Apart from rhyme, identify and illustrate any two sound patterns in this poem. (4 mks)

………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………

 

  • Identify any two onomatopoeic words in the poem above (2mks)

………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………

 

  1. (ii) For each of the following words, provides another word which is pronounced in the same way. (2mks)

(a) Which –

 

  • Groan –

MARKING SCHEME

ENGLISH FORM THREE

101/1

               Functional writing

1 (a) a condolence letter

  • It must be friendly letter

 

Format (4mks)

-Sender address

-Date

-Salutation – Dear Jane (1mk)

-Closing tag – your friend (1mk)

Name

 

Content (5mks)

  • Expres the sorrow for the departed eg I am sorry……………(1mk)
  • Mention the departed (the mother) and reason for the death eg through accident. (1mk)
  • Mention positive attributes of the deoarted (1mk)
  • Encourage the family (1mk)
  • Offer to assist where necessary (1mk)

Languages – (3 marks)

1.(b) it must be no note

Format (3mks)

  • Salutation eg to al form 3 student (1mk)
  • Date (1mk)
  • Signing off your classmate          (1mk)

Name

 

Content (3mks)

Mention that there are ongoing funeral arrangement

Mention the need to contribute money (½ mk)

Amount to contribute (½mk)

The person to receive contributions (½mk)

Date of the burial (½mk)

 

Language (2 mks)

 

  1. Cloze test (10mks)
  2. I
  3. Though
  4. Harder
  5. Team
  6. Chosen
  7. But
  8. These
  9. Should
  10. Not
  11. Only (O but be a capital letter)

 

  1. (a) rhyme scheme.

a b a b c d c d c d e f e f. (1 mk)  Regular rhyme scheme. (1mk)

 

(b) Alliteration (1mk)– face flower (1mk)

Assonance (1mk)  – His written (1mk)

Consonance   Rocks his words

 

(c ) Gleams, thunder (any two onomatopoeic words) (2mks)

 

  1. (ii) homophones

(a) Which – witch

(b) Groan – grown

MARKING SCHEME

  ENGLISH FORM THREE

101/2

  1. Comprehension
  • It is odd that Kenya has abundance of water when it rains (tick) 1 – evidence by the flooding- yet it is also among the world’s most water – scarce countries. (tick) 1
  • It is important because safe water is key in determining the health (tick) 1 of the people in a household and communities. (Tick)
  • The statistics help to emphasize/ draw attention (tick) 1 to the severity of the water problem (tick) 1 by helping us appreciate the number of people (tick) without safe drinking water.
  • At independence the water situation was secure, with almost 2.4 million litres of water per Kenyan per year. (tick)1. However the situation was precarious in 2014, as the water available per person per year had shrunk to 461,000 litres (tick) 1 (student must use a word of contrast or comparison)
  • Deforestation, degradation and encroached of water towers and other catchment areas, wanton logging.

Nb: any two point 2×1 marks – 2 marks

  1. i) legislative, household and private sector interventions

(ii) Rain water harvesting

(iii) Waste water recycling

(iv) Water tower conservation

(v ) tree planting

(vi) reduction in river pollution

(vii) Reduction of water waste

Nb: must be notes if not deduct  up to 50% of the total score

  • Accept any three points.
  1. Excerpt (25 marks)
  2. a) – Olisundon informs Resian of the benefits she will get for marrying him

– Resian get very annoyed and speechless.

– Resian learns that her father had already received dory for her marriage Oloisudai.

– Resian tells Oloisudai that she can never be his wife

– Oloisudari tells her that their fate is sealed

Nb: any point

 

(B)OLOISUDARI

(i) Contemptuous

“He asked the contemptuous quiet of his voice a menace by itself.

 

  • Proud

The feels superior. “  no one plays games with Oloisundari, ask your father, he will tell you

 

  • Patronizing I threatening

“you may opt to go, but when you are mine, you will do as I please.

 

Resian

  • Assertive

Openly confronts Olosundari and tells him what she feels about him eg you are mad…………. “You are nothing but Ol – shuushi”

  • Emotional / short – tempered

“Her eyes were twin pullets from which not tears streamed down continuously.”

 

  1. C) ole kaelo had entered into business deals with oloisudari as his loan guarantor Oloisudari later blackmails olekaelo into marrying his daughter Resian to him or he (Ole – kaelo) facets his beautiful house and business deals.

 

(d) (i)Dialogue between Resian and Olisudari

“Between Resian and Oloisudai”

“I want to go now”

 

(ii)Phetoncal  questions; was there a curse for being born a woman that took away her right to own body  or her a own mind.

 

  • Metaphor “the monster refers to Oloisudari.

NB; accept any other relevant point

 

(e)(i) he had agreed to marry off Resian to Oloisudari in order to sustain his house and business contracts with Oloisudari

NB; accept ant relevant well – explained point

 

(F)Betrayal: Olekaelo betrays his daughters trust by choosing his business deals at the expense of his daughter’s destiny.

 

(ii) Traditions, Resian questions   the traditional role of a woman where she denied right to self expression and cannot question her father’s order orders however ridiculous they are.

NB: accept any other relevant theme.

 

(g) Sad/ sorrowful

We feel sorry for Resian who is defenseless against the combined forces of Oloisundari her father and oppressive traditions.

 

(h) – extortion

– Assassinations

– Robbery

– smuggling

– poaching

– Shadowy business

NB; any two points

 

(i)Resian announced that she wanted to go then.

 

(j) (i) Resian goes to her father shop

(ii) Ole kaelo enquires about the visitor (Oloisudari) that Resian was supposed to be entertained at home

 

(iii)Ole – kaelo enquires what had brought Resian to the shop.

  • Resian enquires from her father about her earlier request to join Egerton University.

3.GRAMMAR

1(a) “I did not rob the bank last month,” said mathege.

(b) Not only does the woman import tea but she also imports maize.

(c) Do we?

(d) The farmer whose goats destroyed the trees in the church farm was arrested.

(e) The bell was rung at 7:00pm

 

2.(a) students’

(b) heroes/ heroines

(c) editors – in chief

 

3 (a)transitively

(b) intransitively

( c ) intransitively

 

4(a) when I come next month (and I am not sure of the day) a lot of things will have changed.

(b) Any information that you have (including minor details) should be submitted to the office.

5 (a) passed out

(b) turned down

(c ) made away with

Teachers' Resources

HISTORY FORM 3 END TERM EXAMS PLUS ANSWERS FREE

ULTIMATE ACHIEVERS ACADEMY

Name___________________________________________________AdmNo:_____________

Date____________________Sign_______________

END OF TERM  EXAMINATION 

FORM THREE

HISTORY

TIME: 2 HOURS 30 MINUTES

INSTRUCTIONS:

  1. This paper consists of three sections: A, B, and
  2. Answer all the questions in section A, three questions in section B and two questions from section C.
  3. Answers to all questions should be written in the answer booklet provided.
SECTION QUESTIONS SCORE
A 1- 17
B 18
19
20
21
C 22
23
24
  TOTAL

 

SECTION A                                                                                                               (25 MARKS) 

Answer all questions in this section

  1. Give one aspect of History. (1 mk)
  2. State two limitations of Anthropology as a source of information on history and government. (2 mks)
  3. Give the main reason why the Nilotic speakers are classified into three groups? (1 mk)
  4. Give one political role of NjuriNcheke among the Ameru in pre-colonial Kenya? (1mk)
  5. Which of the pithecines or hominids was also known as proconsul man? (1 mk)
  6. State one theory that explains the development of crop growing and animal rearing? (1 mk)
  7. Name the family that ruled island of Lamu in the 19th century (1mk)
  8. What are the advantages of using metal over stone as a material for making tools? (2 mks)
  9. Give the meaning of the term citizenship? (1 mk)
  10. State two economic factors that limit national unity? (2 mks)
  11. Identify two characteristics of a good constitution? (2 mks)
  12. Identify the historical period when oral tradition was the main source of information?  (1 mk)
  13. Give two ways through which the early man obtained food? (2 mks)
  14. What was the main contribution of Alexander Graham Bell in the field of communication? (1mk)
  15. Identify two reasons why early urban centres in Ancient Egypt developed in the Nile valley. (2 mks)
  16. Give two strategic factors that led to the scramble for colonies in Africa? (2 mks)
  17. List two independent schools during colonial period? (2 mks)

SECTION B

  1. (a) State any three factors that can lead to revocation of citizenship? (3 mks)

(b) Describe the factors that have undermined government efforts to promote national unity?  (12 mks)

  1. (a) Identify three uses of bronze in the ancient kingdom of Benin? (3 mks)

(b) Explain six factors that led to the emergence of Japan as an industrial power after 1860s?  (12 mks)

  1. (a) What led to the outbreak of the Chimurenga war? (5 mks)

(b) Explain five factors that enabled Samori to resist the whites for long?  (10 mks)

  1. (a) Give three main features of Barter trade? (3 mks)

(b) Explain six factors that led to the development of Trans-Atlantic trade?  (12 mks)

SECTION C

Answer any two questions from this section.

  1. (a) Mention five demerits of democracy? (5 mks)

(b) Explain five functions of Kenyan constitution (10 mks)

 

  1. (a) State five measures taken by the colonial government to ensure that Africans provided labour in the settler farms? (5 mks)

(b) Explain five consequences of colonial land polices in Kenya?  (10 mks)

  1. (a) State three reasons why it took long for Mozambique to achieve independence from Portugal? (3 mks)

(b) Explain six challenges faced by FRELIMO in the struggle for independence in Mozambique?  (12 mks)

END  TERM EXAMS

FORM THREE HISTORY

 MARKING SCHEME.

SECTION A:  (25 MKS)

  1. Give one aspect of History.  (1 mk)
  • Economic aspect
  • Political aspect
  • Social aspect

 

  1. State two limitations of Anthropology as a source of information on history and government.  (2 mks)
  • Expensive – the historian has to live among the community.
  • The researcher may get carried away and interfere with the study
  • It is time consuming
  • People may behave differently in the presence of a researcher leading to distorted information.                            Any 2 x 1 = 2 mks)

 

  1. Give the main reason why the Nilotic speakers are classified into three groups?  (1 mk)
  • The areas in which they settled.                                    (1 x 1 = 1 mk)
  1. Give one political role of Njuri Ncheke among the Ameru in pre-colonial Kenya? (1 mk)
  • Disciplining errant warriors
  • Making laws.

 

  1. Which of the pithecines of hominids was also known as proconsul man?  (1 mk)
  • Dry opithecus africanus                                   (1 x 1 = 1 mk)

 

  1. State one theory that explains the development of crop growing and animal rearing?  (1 mk)
  • One are theory / It developed among a single group of people and spread to the rest of the world/ diffusion theory.
  • Independent theory/developed independently and spread independently in different areas. (1×1=1mk)
  1. Name the family that ruled island of Lamu in the 19th century
  • Nabahan family (1×1=1mk)

 

  1. What are the advantages of using metal over stone as a material for making tools?  (2 mks)
  • Metal tools do not break easily.
  • Metals can be smelted and be rensed.
  • Metals cutting edge can be sharpened
  • Molten metal’s can be cast into various shapes with patters and designs on them.                                                                                     (2 x 1 = 2 mks)
  1. Give the meaning of the term citizenship?  (1 mk)
  • Legal right of belonging to a state. (1 x 1)
  1. State two economic factors that limit national unity?  (2 mks)
  • Corruption
  • Poverty
  • Unfair distribution of resources.

(Any 2 x 1 = 2 mks)

 

  1. Identify two characteristics of a good constitution?  (2 mks)
  • Clarity
  • Flexibility
  • Amendment shoulder be spelt out
  • Comprehensiveness
  • Availing the bill of rights.

(Any 2 x 1 = 2 mks)

 

  1. Identify the historical period when oral tradition was the main source of information?
  • Pre-history

 

  1. Give two ways through which the early man obtained food?
  • Hunting
  • Gathering
  • Fishing
  • Growing crops
  • Livestock keeping (any 2 x 1  = 2 mks)

 

  1. What was the main contribution of Alexander Graham Bell in the field of communication?
  • He invented the telephone                    (1 x 1 = 1 mk)

 

  1. Identify two reasons why early urban centres in Ancient Egypt developed in the Nile valley.  (2 mks)
  • Availability of water
  • Availability of food as a result of agriculture
  • Availability of a means of transport from the river Nile. ( any 2 x 1 = 2 mks)

 

  1. Give two strategic factors that led to the scramble for colonies in Africa?  (2 mks)
  • Egyptian question
  • French activities in congo and West Africa
  • The activities of King Leopold (II) of Belgium. ((any 2 x 1  =  2 mks)

 

  1. List two independent schools during colonial period?  (2 mks)
  • Kikuyu independent school association (KISA)
  • Kikuyu karing’a education association. (KKEA)

(2 x1)  = 2 mks)

SECTION B

  1. (a) State any three factors that can lead to revocation of citizenship?  (3 mks)
  • If prove that registration was acquired fraudulently.
  • If one gives secret information about Kenya especially during war.
  • If one is sentenced during war
  • If one is sentenced to a period of 3 years of more within five years from the time of registration
  • If one is convicted of treason or any other offense within 7 years of registration.

(Any 3 x 1 = 3 mks)

 

(b) Describe the factors that have undermined government efforts to promote national unity?  (12 mks)

  • Ethnicity
  • Political differences
  • Religious differences
  • Corrupt practices
  • Economic disparities
  • International propa gauda against the country
  • Poorly developed transport facilitated which hinder interactions between people.
  • Formation of tribal association and militia groups.

 

 

  1. (a) Identify three uses of bronze in the ancient kingdom of Benin?  (3 mks)
  • Making weapons e.g. shields, spears, arrowheads, swords, daggers.
  • Making sculptures and decorations egg masks, statues, armaments
  • Making utensils e.g knives, pens
  • Store of wealth in Benin.
  • Making shields, tools and chariots. (Any 3  x 1 = 3 mks)

 

(b) Explain six factors that led to the emergence of Japan as an industrial power after 1860s?  (12 mks)

(i) Hardworking and enterprising citizens.

(ii) Long period of political stability  especially after the 2nd World War.

  • High quality goods that have a wide market in Africa , USA and Europe.
  • A highly developed renewable hydro-electric power
  • Availability of skilled and unskilled labour.
  • Existing industrial base was not fully destroyed during the world War (II) and destroyed during the  world war (II) and that formed an industrial base in the psot war 
  • She had a small percentage of suitable agricultural land and so industrialization the only alternative to improve her economy.
  • An open investment policy which encouraged the west to invest.

(any 6 x 2 = 12 mks)

  1. (a) What led to the outbreak of the Chimurenga war?  (5 mks)
  • British took Ndebele animals
  • British took Shona’s and recruited the Ndebele
  • Overtaxing them
  • Forced labour on the Ndebele
  • Dismissing their traditional authority
  • Destroyed their regiments.                    (any 5 x 1 = 5 mks)

 

(b) Explain five factors that enabled Samori to resist the whites for long?  (10 mks)

  • Had a strong army
  • He was a trained solder
  • Had fought Jihand wars.
  • Unity using islam
  • Wealth from his bure mines
  • Had gunsmiths who made guns
  • The scorched earth policy. (any 5 x 2 = 10 mks)

 

  1. (a) Give three main features of Barter trade?  (3 mks)
  • Double coincidence of goods/wants
  • Direct swooping of goods
  • No specific medium of exchange
  • No specific medium of exchange
  • Trade was conducted on mutual understanding
  • Lack of a common language/silent trade (3 x 1 = 3 mks)

 

(b) Explain six factors that led to the development of Trans-Atlantic trade?  (12 mks)

  • European nations had trade links with west Africa earlier before the trans-atlantic trade.
  • Introduction of firearms in West Africa made it easier to raid for slaves.
  • Increased demand for slaves to work in plantations and mines
  • Increased supply of slaves
  • African chiefs had developed a taste for European goods
  • Increased demand for raw materials by European industries.
  • Improved ship-building technology led to building of large ships with a greater capacity for slaves.
  • The trade has very profitable to the merchants which encouraged them to re-invest

(any 6 x 2 = 12 mks)

SECTION C.   (30 MARKS)

  1. (a) Mention five demerits of democracy?
  • It promotes dictatorship of the majority over the minority
  • It promotes class struggle
  • It encourages corruption eg. Vote buying
  • It is slow and wasteful.
  • It is a rule by the elected minority mainly the rich in Kenya who exercise power on the poor (ignorant masses)
  • Those elected lack Moral values e.g. use money to keep their positions
  • Sometimes incompetent leaders gain power due to poor decision by the ignorant people. (any  5 x 1  =  5 mks)

 

(b) Explain five functions of Kenyan constitution

  • Serves as a national document and provides guidelines to other national documents e.g the Kenyan gazette.
  • Provides the rights and freedom of citizens
  • Establishment of Justice (laws) which are fair to all and carried without fair to all and carried without fear or labour.
  • Gives citizens a fair chance of choosing their leaders.
  • Protects minority groups from unfair treatments by majority.
  • Guides on the conduct of individual
  • It sets up the government, tells about its structure
  • Contains a set of rules used to govern the country
  • States powers and duties of various branches of government
  • g. legislature, executive.

(Any 5 x 2  =  2 mks)

  1. (a) State  five measures taken by the colonial government to ensure that Africans provided labour in the settler farms?
  • Taxation introduced
  • Enacting laws that forced African to work
  • Low wages to keep them working throughout
  • Forced recruitment
  • Creation of reserves
  • Introduction of the kipande system
  • Introduction of squatter system – for them to stay in land that they provided labour
  • Forbidden from growing cash-crops

(any 5 x 1  = 5 mks)

 

(b)        Explain five consequences of colonial land polices in Kenya?  (10 mks)

  • Loss of land by the Africans
  • Brought to end of widespread migrations and settlements by the Africans
  • Africans settled in the reserves
  • Brought suffering, poverty and misery among Africans because reserves were congested
  • Interfered with African economic activity
  • Introduction of individual private land ownership
  • Condemned Africans to forced labour. (any 5 x 2 = 10 mks)

 

  1. (a) State three reasons why it took long for Mozambique to achieve independence from Portugal?
  • Portugal was a poor country and was reluctant to part with the economic wealth of Mozambique.
  • Portugal was ruled by kings who had not regard for human rights
  • Portugal regarded Mozambique as one of her provinces and not a colony
  • Portugal had succeeded in suppressing revolts by Africans before nationalism took root in Mozambique.
  • Lack of unity among the Africans
  • Illiteracy among the Africans in Mozambique. (any 3 x 1 = 3 mks)

 

(b) Explain six challenges faced by FRELIMO in the struggle for independence in Mozambique?  (12 mks)

  • The west European countries did not support them.
  • The catholic church viewed it negatively as a terrorist organization which made Africans catholics reluctant to support it.
  • Assassination of Eduardo on third February 1969 was a set back to the struggle.
  • Severe food shortage, clothes, medicine when the war started.  The peasants migrated to areas where supplies were available hence withdrawing their support
  • Internal division, competition and rivalry within FRELIMO because of ideological differences and selfish ambition among the leaders.
  • It was difficult ot keep the Africans united as they were from different tribes
  • Portuguese got support from South Africa and Southern Rhodesia to fight the nationalists in Mozambique.
  • Competition from rival guerrilla movements. E.g revolutionary committee of Mozambique

(any 6 x 2  = 12 mks)

Teachers' Resources

BIOLOGY FORM 3 END TERM EXAMS PLUS ANSWERS FREE

Name____________________________________Class_______________AdmNo:__________

Date__________________________________________Sign_______________

END OF TERM EXAMINATION

FORM THREE

 

BIOLOGY

TIME: 2 HOURS

INSTRUCTION TO THE CANDIDATES.

  • Write your name and admission number in the spaces provided
  • Sign and write the date of examination in the spaces provided
  • Answer all questions in section A and In section C, answer questions 11 (compulsory) and either 12 or 13 in the spaces provided.
  • Answer all the questions in the spaces provided.
  • Candidates should answer all the questions in English.

FOR EXAMINERS USE ONLY

Question/section Maximum score Candidates score
Section A 40

 

  
Section B 40

 

  
Total score 80

 

 

  

 

SECTION A:                                                                                                                                       (34MKS)

Answer all the questions

  1. a) What is transpiration                                                                                                                     1mk

………………………………………………………………………………………………………………………………………………………………………………………………………………………………

  1. b) Give the importance of transpiration in green plants                         3mks

………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………

  1. Name three mechanisms that hinder self-fertilization in green plants                                             3mks

………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………

  1. Name two classes of phylum Arthropoda that has cephalothorax                                                    2mks

………………………………………………………………………………………………………………………………………………………………………………………………………………………………

  1. a) Give two roles of testes in humans                                                                                                2mks

………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………

  1. b) Name two organs that produce the hormone progesterone in female                         2mks

………………………………………………………………………………………………………………………………………………………………………………………………………………………………

  1. a) Give two reasons why an electron microscope cannot be used to view live specimens                   2mks

………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………

 

 

  1. b) State the function of eye piece tube in a light microscope                         1mk

………………………………………………………………………………………………………………………………………………………………………………………………………………………………

  1. Name the organelle that is involved in each of the following                                                          2mks
  1. manufacture of lipids

…………………………………………………………………………………….

  1. formation of lysosomes

………………………………………………………………………………………………………………

 

 

 

Process X

 

 

Large fat droplets                                                        small fat droplets

 

  1. a) Name process X                                                                                                                 1mk

 

………………………………………………………………………………………………………………………

  1. State the significance of the process named above       2mks

………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………

  1. State the use of the following apparatus used in collection of specimens.                          3mks
  1. pooter…………………………………………………………………………………………………………………………………………………………………………………………………………..
  2. Baittrap

……………………………………………………………………………………………………………………………………………………………………………………………………..

  1. Fishnet

……………………………………………………………………………………………………………………………………………………………………………………………………………………

  1. The diagram below shows how gaseous exchange occurs across the gills of a fish
  1. According to the diagram, water and blood flows in opposite directions across the gills
  2. Give the term used to describe the flow                                                               1mk

……………………………………………………………………………………..

  1. Explain the advantage of the flow named above             2mks

……………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………… ……………………………………………………..

  1. What difference would be observed if water and blood flowed across the gills in the same direction 2mks

………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………….. ………………………………………………………

  1. Name two organs in man which displays the flow system named in a) i) above                                      2mks

………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………..

  1. How are the gill rakers found in the gills of a fish adapted to perform their function                         1mk

…………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………

 

 

 

 

  1. The temperature of a person was taken before during and after bath. The results are shown in the graph below

 

 

 

37

36                         Before                                                after

Temps                                                                     during

 

35

Time in minutes

 

  1. Explain why the temperature decreased during the bath                                                               3mks

………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………

  1. What changes occurred in the skin that enabled the body temperatures to return back to normal .4mks

……………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………

  1. Name the specific part of human brain that controls body temperature                                        1mk

………………………………………………………………………………………………..

 

 

 

 

 

 

SECTION B : Answer question 11(compulsory) and either Question 12 or 13.

  1. In an experiment, a mixture of starch and salivary amylase solution was uniformly mixed in a beaker. 5ml of the mixture was drawn using a syringe and transferred into a visking tubing after which both ends were tightly tied ensuring there is no leakages. Six such viskingtubings were prepared. They were rinsed with distilled water on the outside then transferred at once to water bath maintained at 370c in a beaker. From time 0 and every 5 minutes interval, one visking tubing was removed from the water bath and analyzed for starch. At the same time, the contents of the water bath in the beaker were also analyzed for reducing sugars for each time intervals.

The table below shows the results

 

Timer in minutes Concentration of the food substances
  Starch in the visking tubing mg\L Simple sugars in the beaker mg/L
0 100

 

 0
5 92

 

 8
10 66

 

 34
15 36

 

 64
20 16

 

 84
25 8

 

 88

 

 

 

 

 

  1. Using a suitable scale represent the data on the grid provided below 8mks

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

  1. At what time was there an equal concentration of starch and simple sugars    1mk

…………………………………………………………………………………….

  • Using the graph paper indicate the times when the concentrations of starch and simple sugars were 70mg/L                                                             2mks

………………………………………………………………………………………………………………………………………………………………………………………………………………

  1. Why was the temperature maintained at 370c                         2mks

………………………………………………………………………………………………………………………………………………………………………………………………………………

  1. Name the enzyme that was used in the experiment                   1mk

……………………………………………………………………….……………………………

  1. State and explain the results that will be observed if the water in the beaker was tested for starch 3mks

………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………

  1. What are the digestive roles of saliva in the mouth                                                                  3mks

……………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………….

  1. a) Describe the structural features of the leaves that decreases the rate of transpiration in plants     10mks

 

  1. b) Describe the mechanism of transport of carbon IV oxide in the mammalian blood             10mks
  2. a) What is pollution                2mks
  3. b) Describe various causes and effects of air pollution and for each cause state its control method

18mks

…………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………….……………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………

 EXAM MARKING SCHEME

231/1

MARKING SCHEME

  1. a) transpiration is the process by which plants lose water inform of water vapor to the atmosphere through the stomata or lenticels.
  2. b)
  • brings about turgor in plants
  • helps to remove excess water especially to the aquatic plants
  • serves to cool plants in hot environment
  • helps in transport of mineral salts/ions and water in the plant
  • protandry
  • progyny
  • heterostyly
  • monoecious/ dioecius
  • incompatibility/self sterility
  • arachnida
  • crustacea
  1. a)
  • secretion of androgens/testosterone rej. Hormone
  • manufacture of sperms/male gametes rej. Gamete alone
  1. b)
  • ovary
  • placenta
  1. a)
  • specimen is mounted in a vacuum
  • specimen is illuminated by beam of electrons which would kill cells
  • dyes used are obtained from heavy metals which are toxic to cells
  1. b)
  • hold the eye piece lens( in position)

 

  1. a) smooth endoplasmic reticulum
  2. b) golgi bodies /apparatus
  3. a) emulsification
  4. b) used to increase surface area for enzymatic activity
  5. a) used for sucking small animals from rock surfaces or bark of trees eg ants
  6. b) for attracting and trapping small animals eg rats
  7. c) used for trapping small fish and other small aquatic aninmalseg crabs
  8. a) i) counter current flow
  9. ii) it maintains a steep concentration gradient hence increases the efficiency of oxygenation of the blood as well as diffusion of carbon iv oxide from the blood to water,.
  10. b) the diffusion gradient would be low leading to low rate of gaseous exchange; equilibrium between water and blood would be reached ; beyond which no further diffusion can take pklace
  11. c)
  • kidney/ nephron
  • placenta
  1. d) its rake like/ saw like/teeth like to trap solid particles (which may damage delicate gills filaments)
  2. a) heat was lost by conduction/ convection fro the body/skin to cold water; the cooler blood leaving the skin enter the general circulation cooling the body
  3. b)
  • vasocontriction thus less blood flowing to the skin surface reducing heat loss;
  • sweating stops
  • shivering
  1. c) hypothalamus

11.a)  plotting – 2mks

Scale – 2mks

Labelling- 1mk

Identifying curves- 2mks

Curve -1mk

  1. b) i) 12.5min ± 0.5
  2. ii) starch; 16min ± 5

reducing 9.5 min ±  0.5

iii) to provide a suitable optimum temperature for the activity of the enzymes

  1. c) amylase( salivary/pancreatic) ; diastase
  2. d) brown color of iodine is retained; because starch is still absent; the starch molecules are too larhe and cannot pass through the tiny poress of the visking tubing membrane into the water in the beaker

OWTTE

  1. e) saliva contains salivary amylase ; that breaks down starch into maltose; and bicarbonate ions that provides a suitable alkaline ph for the activity of salivary amylase during digestion

12 a)

  • Leaves are modified into spines/ thorns ; to reduce surface are over which transpiration can occur
  • Shed their leaves during dry seasons; to reduce surface area exposed to the atmosphere
  • Leaves have thick waxy cuticle; to minimize rate of cuticular transpiration
  • Some of leaves with hinge cells hence can roll or fold to reduce rate of transpiration by exposing fewer stomata to the environment hence reducing chances of transpiration
  • Have sunken stomata which accumulates moisture in substomatal spaces hence low diffusion gradient thus reducing transpiration rate
  • Have reduced number of stomata hence low rate of transpiration since the surface area for water loss is reduced
  • Some have reversed stomatal rhythm to prevent excessive water loss by transpiration
  • Have parenchyma cell in swollen leaves for storage of water eg cactus
  1. b)
  2. i) a weak carbonic acid in the red blood cells/ bicarbonate ions;

carbon iv oxide on entering the red blood cells reacts with water forming carbonic acid; this process is usually enhanced by catalytic activity of enzyme carbonic anhydrase in the red blood cells; being unstable, the carbonic acid dissociates to hydrogen ions and bicarbonate ions; which acts as buffer; the bicarbonate ions diffuses into the blood plasma and transported to the lungs; on reaching the lungs, they undergo chemical processes(accept explanation of the process) resulting to the formation of the carbon iv oxide which is then exhaled

  1. ii) when physically dissolved in plasma/ weak carbonic acid in blood plasma

carbon iv oxide is transported when physically dissolved in plasma to form a weak carbonic acid; the weak carbonic acid being unstable, dissociates to form hydrogen ions bicarbonate ions/ hydrogen carbonate ions; the hydrogen carbonate ions are transported to the lungs ; where they dissociates to water and carbon iv oxide ; from where carbon iv oxide is exhaled; the hydrogen ions remains in the blood plasma and are mainly secteted into the kidney tubules for excretion when in excess; this method is slow and hence inefficient

iii. when bound to haemoglobin in red blood cells

carbon iv oxide binds to the haemoglobin to form carbominohaemoglobin; being somewhat stable it does not dissociate and carbon iv oxide is transported in thuis form from tissues to lungs; because of high partial pressure of oxygen in the lungs the haemoglobin detaches from the carbon iv oxide; and picks up oxygen; the free carbon iv oxide is then exhaled out of the body .

 

  1. a) pollution is the release of substance or forms of energy; in quantities whose effect is harmful or unpleasant to organisms
  2. b) Sulphur based chemicals( Sulphur iv oxide, hydrogen sulphide)

produced by industries, decomposing organic matter and fumes; affects gaseous exchange ; makes acidic rain and damage leaves affecting photosyntheasis

control method– titration, dissolution and use of chemicals to remove harmful gases

smoke and fumes ; produced in areas with heavy industries, motorvehicles and contain carbon ii oxide; carbon ii oxide combines with haemoglobin to form stable carboxyhaemoglobin which is a respiratory poison; affects visibility;

control– factories should be erected far away from residential areas

dust– produced from cement, gfactories and quarries; it settles on leaves limiting photosynthesis  and causes poor visibility

control– government to enact laws on environmental pollution

sound/ noise– produced by machines aeroplanes  and heavy vehicles and affects heasring in animals

control– ear muffs should be used in industries and jua kali workshops that generates noise

aerosols– consist of fire particles, suspended gases in hebicides, insecticides and sprays; they contain copper metal- when copper is inhaled causes irritation and respiratory diseases, depletion of ozone layer and its non- biodegradable

control– used biological methods of pests control

oxides of nitrogen( nitrogen ii oxide, nitrogen iv oxide)

produced from burning petroleum fules and industries

nitrogencmpounds dissolves in rain water to form acidic rain , its carcinogenic; causes poor visibility on road users

control – use of public means of transport

Teachers' Resources

CHEMISTRY FORM 3 END TERM EXAMS PLUS ANSWERS FREE

ULTIMATE ACHIEVERS ACADEMY

Name___________________________________________________AdmNo:_____________

Date__________________________________________Sign______________

END OF TERM  EXAMINATION 

FORM THREE

CHEMISTRY

2 HOURS

Instructions to candidates:

  1. Answer all questions in both section A and B.
  2. All working must be clearly shown and, in the spaces provided.

FOR EXAMINER’S USE ONLY

Section Maximum

Score

 Candidate’s

Score
A 40  
B 40  
Grand Score 80  

 

SECTION A                                                                                                               40MARKS

  1. Distinguish between an element and a compound. (2 Mks)

………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………

  1. A compound has an empirical formula of C2H5 Given it has a R.M.M. of 90, determine its molecular formulae. (C=12, H=1, O=16)                                                 (2 Mks)

………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………

  1. Identify the particles responsible for electrical conductivity in each of the following. (3 Mks)
  2. Molten sodium chloride

…………………………………………………………………………………………………

  1. Zinc metal

…………………………………………………………………………………………………

  1. Graphite

…………………………………………………………………………………………………………

  1. The diagram below shows a set up used to investigate one of the conditions necessary for rusting.

 

 

 

 

 

 

 

  1. Identify the conditions being investigated in the experiment. (1 Mk)

………………………………………………………………………………………………

  1. State whether rusting occurred or Not. (1 Mk)

………………………………………………………………………………………………

  1. Explain why rusting occurs faster near factories that emit gases such as CO2, NO2 and SO2 into the atmosphere.                                                       (2 Mks)

………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………

  1. Explain why a reaction occurs between copper (ii) oxide and magnesium powder, but no reaction occurs between magnesium oxide and copper powder.                                           (2 Mks)

………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………

  1. The set-up below shows one of the methods used to separate a mixture of liquids P and Q

 

 

 

 

 

 

 

 

  1. State two properties of the liquids P and Q that make it possible to separate using the above method.                                     (2 Mks)

………………………………………………………………………………………………………………………………………………………………………………………………

  1. Name any other two methods that can be used to separate the mixture of liquids p and Q.

(2 mks)

………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………

  1. The diagram below shows arrangement of particles in the three state of matter in no particular order.

 

 

 

 

 

 

 

  1. Which of the diagrams I, II and III represents;
  2. Matter in the solid state. (1 Mks)

………………………………………………………………………………………

  1. Matter in the gaseous state. (1 Mk)

………………………………………………………………………………………………

  • State in which matter has the highest kinetic energy. (1 Mk)

………………………………………………………………………………………………

  1. The ratio of the rates if diffusion of gas X and gas y is 3:8. Given that 200 cm3of gas X diffuse through a porous plug in 75 seconds. How long would it take 160 cm3 of gas Y to diffuse under the same conditions?                                           (3 Mks)

 

 

 

 

 

  1. Describe how you can prepare a dry sample of barium sulphate starting with Barium nitrate crystals. (3 Mks)

……………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………

  1. Sodium carbonate can be obtained on large scale by manufacturing through the Solvay process.
  2. Name two raw materials for this process. (2 Mks)

……………………………………………………………………………………………………………………………………………………………………………………………………

  1. Identify any other method that can be used to obtain sodium carbonate on large scale.

(1 Mk)

…………………………………………………………………………………………………

  • State one use of sodium carbonate. (1 Mk)

…………………………………………………………………………………………………

  1. Molten lead (ii) bromide was electrolyzed using carbon electrodes.
  2. Name any other substance that can suitably be used as electrodes in place of carbon. (1 Mk)

…………………………………………………………………………………………………

  1. Name the product formed at the cathode. (1 Mk)

…………………………………………………………………………………………………

  1. Write the ionic equation of the reaction that occurred at the cathode. (1 Mk)

…………………………………………………………………………………………………

  1. The diagram below shows parts of a set-up to prepare and collect dry hydrogen gas.

 

 

 

 

  1. Identify reagent N and drying agent K. (2 Mks)

……………………………………………………………………………………………………………………………………………………………………………………………………………………

  1. Complete the diagram to show how the dry hydrogen gas is collected.                                     (2 Mks)

 

……………………………………………………………………………………………………………………………………………………………………………………………………………………

  1. Using universal indicator, describe how you can determine the PH value of a given solution.

(2 Mks)

……………………………………………………………………………………………………………………………………………………………………………………………………………………

  1. State one advantage of universal indicator over other commercial indicators. (1 Mk)

……………………………………………………………………………………………………………………………………………………………………………………………………………………

 

SECTION B

  1. The grid below shows a section of the periodic table, the letters are not the actual chemical symbols.

 

 

  1. Name the family into which element Q belongs to (1 Mk)

…………………………………………………………………………………………………

  1. Element E can be placed in group I or group VII. Explain why (2 Mks)

………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………

 

  1. What Name is given to the elements found in the shaded region W. (1 Mk)

 

…………………………………………………………………………………………………………

  1. Which letter represents element with the highest melting point in group II. Give reasons

(2 Mks)

……………………………………………………………………………………………………………………………………………………………………………………………………………………

  1. Write the chemical formulae of the;
  2. Sulphate of L (1 Mk)

…………………………………………………………………………………………………………

  1. Nitrate of R (1 Mk)

…………………………………………………………………………………………………………

  1. How does the following compare? Explain your answer
  2. Reactivity of J and N. (2 Mks)

……………………………………………………………………………………………………………………………………………………………………………………………………………………

  1. Boilling point of the oxides of M and T.                         (2 Mks)

……………………………………………………………………………………………………………………………………………………………………………………………………………………

  1. In an experiment, 80 cm3 of 0.75 M hydrochloride acid were reacted with excess zinc carbonate to form solution W, Liquid R and gas T.
  2. Identify solution W and gas T. (2 Mks)

……………………………………………………………………………………………………………………………………………………………………………………………………………………

  1. Write a chemical equation of the reaction that occurred. (1 Mk)

…………………………………………………………………………………………………………

  1. Calculate the;
  2. Number of moles of hydrochloric acid that reacted with the zinc carbonate. ( 2 Mks)

 

 

  1. Number of moles of the Zinc carbonate that reacted with the acid (2 Mks)

 

 

  • Mass of the Zinc carbonate that reacted with the acid. (Zn = 65, C= 12, O= 16)

(2 Mks)

 

 

 

  1. Volume of gas T evolved at r.t.p. (1 Mole of gas at r.t.p. = 24 litres) (2 Mks)

 

 

  1. (a). Name the following hydrocarbons                                           (3Mks)
  2. CH3CH2CH2CH2CH3 ______________________________________

 

 

  1. CH3CHCHCHCH2 ________________________________________

 

Br        CH3                               Br

  • H –   C    –    C    –    C    =    C   –    C   –   H

 

 

H               CH3                       H

 

  1. The diagram below shows some reactions involving hydrocarbons.

 

 

 

 

 

 

  1. Identify the following (5 Mks)

I – substance L

…………………………………………………………………………………………………………

II – Substance M

…………………………………………………………………………………………………………

III – Substance Q

…………………………………………………………………………………………………………

IV – Process P

…………………………………………………………………………………………………………

V – Process N

…………………………………………………………………………………………………………

  1. Name two substances that can be used as catalysts during process W. (2 Mks)

……………………………………………………………………………………………………………………………………………………………………………………………………………………

  1. Nitrogen (iv) oxide is one of the oxides of nitrogen.
  2. Name the other two oxides of nitrogen (2 Mks)

……………………………………………………………………………………………………………………………………………………………………………………………………………………

 

  1. Which of the oxides you have named in a(i) above relights a glowing splint. (1 Mk)

 

……………………………………………………………………………………………………………………………………………………………………………………………………………………

  1. Ammonia is a compound of nitrogen that can be obtained industrially by the Haber process;
  2. Other than nitrogen, name the other raw material for this process. (1 Mk)

…………………………………………………………………………………………………………

  1. Write a chemical equation of the reaction that occurs in the catalytic chamber to produce Ammonia. (1 Mk)

……………………………………………………………………………………………………………………………………………………………………………………………………………………

  • State one use of ammonia (1 Mk)

……………………………………………………………………………………………………………………………………………………………………………………………………………………

  1. When burning magnesium is lowered into a gas jar containing air magnesium oxide is one of the products formed. Name the other product that can possibly be formed. (1 mk)

……………………………………………………………………………………………………………………………………………………………………………………………………………………