Form 2 Maths Exams and Marking Schemes Free

MATHEMATICS

TERM 3

 

NAME: …………………………………………………ADM NO……………….

CLASS………………..DATE…………………

FORM TWO

MATHEMATICS

TIME: 2 ½ HOURS

Instructions

1. Write your name, adm no. class and date 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 and any five in section II
4. Section I has sixteen questions and section II has eight questions
5. All answers and working must be written on the question paper in the spaces provided below each question.
6. Show all the steps in your calculations, giving your answers at each stage in

the spaces below each question

7. KNEC Mathematical table and silent non-programmable calculators

may be used.

 

FOR EXAMINER’S USE ONLY

 

SECTION I

 

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

 

SECTION II

	GRAND TOTAL

 

 

17	18	19	20	21	22	23	24	Total

 

 

This paper consists of 14 printed pages

 

 

 

 

 

 

SECTION 1 (50 MARKS)

Answer any FIVE questions in this section in the spaces provided

1.Evaluate:           +                                                                 (3mks)

of (  +)

 

 

 

 

2.Express as a fraction.                                                                                              (2mks )

0.

 

 

 

 

3.Simplify                                                                                                                   (3mks)

 

 

 

 

4. Fifteen tractors each working eight hours a day take eight days to plough a piece of land. How long would it take 24 tractors each working 10 hours a day to plough the same piece of land 3mks)

 

 

 

 

 

 

5. The shaded region below shows the area swept out on a flat windscreen by a wiper. Calculate the area of the shaded region. (4mks)

 

 

 

4cm

 

 

16cm                120^o

 

 

 

 

 

 

 

6.The mass of two bags of beans and three bags of salt is 410kg. If the mass of three bags of beans and two bags of salt is 390kg, find the mass of each bag.                              (3mks)

 

 

 

 

 

 

7.The interior angle of a regular polygon is twice the exterior angle.

1. Find the number of sides of the polygon. (3mks)

 

 

 

 

1. What is the name of the polygon?       (1mks)

 

 

8. The angle of elevation of a church tower from a point A, 50 metres away from the foot of the church is 24^o. Find the distance between A and B if the angle of elevation of the tower from B is 20^o. (4mks)

 

 

 

 

 

 

 

9.The figure below is a cross section of a swimming pool 8m wide. Calculate the capacity of the pool in litres.                                                                                                    (3mks)

 

 

30m

 

1m

3m

 

 

 

 

 

 

 

 

 

10. Three litres of water (density 1g/cm³) is added to twelve litres of alcohol (density 0.8/cm³).What is the density of the mixture? (3mks)

 

 

 

 

 

 

11. The volume of two similar solid spheres are 4752cm³ and 1408cm³. If the surface area of the small sphere is 352cm², find the surface area of the larger sphere.             (3mks)

 

 

 

 

12. Solve for x in the equation = 32 (3mks)

 

 

 

 

 

13. Momanyi spent one eight of his February Salary on farming, half on school fees and two thirds of the remainder on food. Calculate his February salary and the amount he spend on school fees if he spent sh. 3200 on food. (3marks)

 

 

 

 

14. Form three inequalities that satisfy the unshaded region R. (3marks)

 

15. A Kenyan tourist in US borrowed 10,000 US dollars to pay for his son’s examination.

He is expected to pay either in Kenyan shillings or through an account in the United Kingdom in

sterling pounds.  If he decided to pay through United Kingdom, how much would he save given

that

1 US dollar                 = 82.4 Kenyan shillings

1 Sterling pound         = 1.4 US dollar

1 Sterling pound         = 105 Kenyan shillings                                  (3mks)

 

 

 

 

 

16. Solve for X in the equation. (3mks)

 

 

 

 

 

 

 

 

 

 

SECTION II (50MKS)

Answer any FIVE questions in this section in the spaces provided

17. The figure below shows a glass in form of a frustrum of a cone whose top and bottom diameter of 7cm and 3.5cm respectively. Its depth is 10cm. Taking ,

Calculate;

1. a) Its total surface area. (5 marks)

 

 

 

 

 

 

 

b). Its capacity in litres.                                                                                             (5 marks)

 

 

 

 

 

 

 

18.Two friends Jane and Tom live 40km apart. One day Jane left her house at 9.00am and cycled towards Tom’s house at an average speed of 15km/hr. Tom left at 10.30am on the same day and cycled towards Jane’s house at an average speed of 25km/hr.

1. Determine;
2. The distance from Jane’s house, where the two friends met. (4 marks)

 

 

 

 

 

 

 

 

 

1. The time they met. (2 marks)

 

 

 

 

• How far Jane was from Tom’s house when they met? (2 marks)

 

 

 

1. The two friends took 10 minutes at the meeting point and they cycled to Tom’s house at an average speed of 12km/hr. Find the time they arrived at Tom’s house. (2 marks)

 

 

 

 

 

 

 

19. Town Q is 180km on bearing of 050^o from town P. Another town R is on a bearing 110^o from P and also on compass bearing S 30^oE from Q. Town S is South of P and also West of R.

Using scale 1 cm rep. 20 km;

1. Draw the scale diagram to show the positions of the four towns. (6 marks)

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

1. Use your scale diagram in (a) above to find;
2. The distance of R from P. (1 mark)

 

 

1. The bearing of Q from S. (1 mark)

 

 

• The distance of Q from S. (1 mark)

 

 

1. How far P is North of S. (1 mark)

 

20. The mark of 100 candidates for mathematics examination were distributed as follows.

marks	No of candidates(f)	Mid-point(x)	fx	c.f
30-34 35-39 40-44 45-49 50-54 55-59 60-64	5 24 26 24 13 6 2

 

(a)Calculate

(i) The mean mark                                                                                          (2mks)

 

 

 

 

 

(ii) The median                                                                                               (3mks)

 

 

 

 

 

 

 

 

 

(b) On the grid provided, draw a histogram.                                                             (3mks)

 

(c) On the same graph, draw a frequency polygon.                                       (1mk)

 

(d) Find the modal mark.                                                                                                       (1mk)

 

 

 

 

 

 

 

 

 

 

21. The figure below shows two circles of radii 10.5 and 8.4cm and with centres A and B respectively. The common chord PQ is 9cm.

(a)       Calculate angle PAQ.                                                                                     (2 mks)

 

 

 

 

 

 

 

 

 

 

(b)       Calculate angle PBQ.                                                                         (2 mks)

 

 

 

 

 

 

 

(c)       Calculate the area of the shaded part.                                                (6 mks)

 

 

 

 

 

 

 

22. Three business partners; Kamau, Tatwa and Makau contributed Ksh. 100,000, Ksh. 80,000 and Ksh. 50,000 respectively to start a business. After one year, the business realized a profit which they shared in the ratio of their contributions.
    • If Makau’s share of profit was Kshs. 20,000, how much was the total amount of profit?

(3mks)

 

 

 

 

 

 

 

• At the beginning of the second year, Makau boosted his shares by Ksh. 10,000. If the business profit increased by 20% at the end of the second year, calculate:-
  • Kamau’s share of the profit.   (4mks)

 

 

 

 

 

• The difference between Kamau’s and Tatwa’s share of profit.   (3mks)

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

23. (a) Show by shading the unwanted region, the region which satisfies the following inequalities (8mks)

 

Y > -3

4y ≤5x + 20

2y < – 5 x + 10

4y≤ -3x – 12

 

 

(b) Calculate the area of this region in a square units                                               (2mks)

 

 

 

 

24. Triangle ABC has the vertices A (3, 1), B (2, 2) and C (3, 4).

(a)  On the grid provided draw triangle ABC and its image A¹B¹C¹ under a rotation of negative quarter turn about the point (0,0)                                                                   (3 marks)

 

(b)   (i)  Draw triangle A¹¹B¹¹C¹¹  the image of  A¹B¹C¹ under a reflection in the line y = -x     (2 marks)

(ii)  Describe fully the transformation that maps A¹¹B¹¹C¹¹ onto   ABC            (2 marks)

 

(c)    (i)  On the same axes draw triangle A¹¹¹B¹¹¹C¹¹¹  the image of   A¹¹B¹¹C¹¹ under a translation given by translation Vector

(iii)  State the co ordinates of  A¹¹¹B¹¹¹C¹¹¹                         (2 marks)

 ^{______________________________________________________________________________________}

MATHEMATICS FORM 2

MARKING SCHEME

1Evaluate:  +         +                                                                                 (2mks)

of (  + )

 

:  +      +

of (  + )

 

+

=

 

=25+  = 25

 

 

2. Let r= 0.1515

100r=15.1515

99r=15.0000

R=  =

3. Simplify (2mks)

a(y-x)= a(y-x) = a = -a

b(y-x)   – b(y-x) –b    b

4. T D                 H

15               8                  8

24                                   10

15/24          x        8/10×8= 4 days

 

 

 

 

5.

 

 

A1 = 0/360  r²

=120/360×3.142×20²=418.933cm²

4cm                                                                  = 2.68.117cm²

 

Area of shaded region.=418.933-268.17

16cm            120^o                                                     =150.816cm²

 

 

 

6. 2b+3s=410

3b+2s=390

4b+6s=820

9b+6b=1170

5b+0=350

5b=350

5     5

2×70+35=410

140+35=410

3s=410-140

3s=270

3      3

S=90

Beans=70bags

Salt=90bag

7a). Let the exterior angle be x

X+2x=180

3x=180

X=60^o

no  of sides

360/60=6

 

1. b) Hexagon

 

8. Tan 24^o= h/50

50 tan 24^o = H

Tan 20^o = H/(50 +x)

(50+x) tan 20=H

18.1999+0.364x=22.26

0.3640c=22.26-18.199

0.364x=4.061

X=4.061

0.364

=11.16m

 

9. Volume of water=Ah

A=1/2(1×3) x 30= 60m²

V=60m² x 8m=480m³

1m³=1000L

480m³=?

480m3 x 1000L

1m³

= 480,000L

 

10. Total vol = 15 litres = 15000cm³

Tota; mass = 3000g + (12000 ´ 0.8)g

= 3000g + 9600g = 12600g                                                        M1

Density   =                                                                    M1

= 0.84g/cm³                                                                           A1

 

11. VSF = 3.375

LSF =                                                                                                                M1

ASF = (1.5)²

Area of larger cylinder

= 352 x 2.25= 792cm²                                                                                                                                  A1

12. ^{X 1- X} = 32

 

( ^{X 1- X} =

 

 

 

 

13.

1. February salary School fees

M1         A1     B1

 

14.

2.

B1 B1 B1

 

 

 

15. 10,000 ´ 82.4 = 824000 M1

10,000                                                                          M1

824000 – 750000 =

Sh.74000                                                                                                         A1

 

16. L.C.M=12 24x-16-12x+6=12-10x

24x-12x+10x=12-6+16

22x=22

X=1

 

 

SECTION II

 

17

x = 9.85 9.85 3.5 10 1.75 3.5 1.75 ℓ = 9.85 L = 19.69 a)               T.S.A =  + ( RL – rL) = (r2 + RL – rL) =  (1.752 + 3.52 x 19.69 – 1.75 x 9.85) =  x 54.18 = 171.1cm2   b) Vol = R2H – r2h H = 20 h = 10 (R2H – r2h) (3.52 x 20 – 1.752 x 10) (245 – 30.625) x 214.375 cm3

B1       M1 M1 M1 A1     B1     M1 M1   M1 A1

 

 

 

18a)	i)      10.30 –9.00 1.30 Jane travelled =  x 15 = 22.5 Distance before Tom starts journey Relative speed = 15 + 25 = 40km/hr T.T.T.M = = 0.4375 hrs 15 x 0.4375 = 6.5625km 22.5 + 6.5625 = 29.0625km   ii)    They met after 0.4375 hrs = 0.4375 x 60 = 26 minutes 10.30 +   26 10.56am iii)  Jane had travelled 29.0625km = 40.00 – 29.0625 = 10.9375km   b)    = 0.91146 hrs 0.91146 hrs = 55 minutes Add rest time = 10 minutes = 65 = 1 hr 5 minutes 10.56 +1.05 12.01 pm	M1     M1   B1   A1       M1     M1   B1 B1         M1     A1
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19	a)                                     b) i)      Distance R from P = 13.4cm ± 0.1 But 1 cm rep 20km = 13.4 x 20 = 268km   ii)    Bearing of Q from S 034o ± 001o   iii)  Distance of Q from S 12.4cm ± 0.1 But 1cm rep 20km = 12.4 x 20 = 248km iv)   How far P is north of S = 4.5cm But 1cm rep 20km = 4.5 x 20 = 90km	B1     B1       B1     B1

 

 

 

 

 

21	a) < PAQ = <PAM + <QAM < PAM = sinθ1 = Sin -1 (0.4286) = 25.380 < QAM = <PAM = 25.38 →<LAP = 25.38×2= 50.76   b)  <PBQ = < PBM + <QBM < PBM = sin∝1 = Sin-1 (0.5357) = 32.390 < PBM = <QBM = 32.390 <PBQ = 32.390x 2 = 64.78       c)i)   area of segment = area of a section – area of D Taking (i) = = 48.84 – 42.69 = 6.15cm2 Taking (ii) = = 39.89 – 31.92 = 7.97cm2 = (6.15 + 7.97) cm2 = 14.12cm2	M1   A1         M1   A1           M1     B1   M1M1   B1   A1

 

22.a) Kamau              Tatwa           Makau 100,000             80,000         50,000 10           :          8         :        5 5     = 20,000 23 1 = ? 20,000 x 23 5 = 92,000   (a)    (i)  New Ratio 5 : 4 : 3 120 x 92,000 100 New profit = 110,400   Kamau’s share = 5 x 110,400 12 = 46,000   (ii)  Tatwa’s share = 4 x 110,400 12 = 36,800 Difference = 46,000 – 36,800 = 9,200	B1   M1     A1       B1   B1     M1   A1   M1   M1   A1
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