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# KNEC KCSE Mathematics Paper 1 Question Paper / 2016 KCSE MOKASA Joint Examination

## KNEC KCSE Mathematics Paper 1 Question Paper / 2016 KCSE MOKASA Joint Examination

### SECTION A (50 Marks)

Answer all questions in this section in the spaces provided

1.

Simplify without using table or a calculator to its lowest form. 3 marks

2.

Abraham’s money box contains only sh. 5 coins and sh. 10 coins. There are 24 coins
and their total value is sh. 150. Find how many of each kind of coins there are in the
box.

3 marks

3.

The gradient of a straight line M1 passing through the points (P(3, 4) and Q(x, y) is −3/2.
A line M2 is perpendicular to M1 and passes through the points Q and R(2, -1).
Determine the values of X and Y.

3 marks

4.

Three inequalities define the region R shown below. Form the inequalities. 3 marks

5.

Given that a = 10.5, b = 9.6 and c = 1.4 all correct to the decimal place. Find the
percentage error involved in the calculation of a𝑎+ b/c𝑏𝑏to 1 d. p .

3 marks

6.

The GCD of three numbers is 4 while the LCM is 360. If two of the numbers are 24 and 40. List two other possible numbers.

3 marks

7.

Given that dy/dx= 2x2 + 3 and that y = 3 when x = 0, find the value of y when x = 1/3.

3 marks

8.

After buying 52 Sterling pounds, a businessman decided to exchange his money for US
dollars. Using the following currency exchange rate, calculate to 3s.f. the number of dollars he ended up with.
1 US dollars (\$) = ksh. 89.75
1 Sterling pound (£) = ksh. 135.47

3 marks

9.

Solve for X and Y in
4x𝑥𝑥 × 4y𝑦𝑦 = 1
32 y𝑥𝑥 = 81

3 marks

10.

Given the number 11055. Show that the number is divisible by 3, 5 and 11 using necessary divisibility tests.

3 marks

11.

Calculate the area of the shaded region in the figure below, given that;
OX = OY = 10cm and XY = 16 cm. (Take 𝜋π𝜋 = 3.142) 4 marks

12.

The figure below represents a model of a prism ABCDEF drawn to scale. Complete the
prism. 3 marks

13.

Use reciprocal table to find the value of 1/0.325. Hence evaluate 3√0.000125/0.325 .

3 marks

14.

A poultry farmer has brown and white chicken; the brown chicken are twice as many as
the white ones; of the white chicken 2/5 are layers while the rest are cockerels; of the
brown ones 5/12 are layers while the rest are cockerels. If the chicken is picked at
random in the dark, find the probability that it will be a cockerel.

3 marks

15.

Triangle PQR has vertices P(3, 2), Q(-1, 1) and R(-3, -1). Under a rotation the vertices of
P1Q1R1 are P1(1, 4), Q1(2, 0) and R1(4, -1). By construction find the centre and angle of
rotation.

4 marks

16.

A metal cuboid of length 12cm, width 10cm and height 6cm has a density of 1.4g per cm3. A
cylinder of different metal has a base radius of 6cm and height 12m, with a density of 1.8
g/cm3. The two solids are melted down to recast in the shape of a cube without loss of metal.
(Take π = 3.142). Calculate the average density of the cube.

3 marks

### SECTION B (50 Marks)

Answer any five questions in this section

17.

Three hundred and sixty litres of a homogenous paint is made by mixing three types of
paints A, B and C. The ratio by volume of paint A to paint B is 3:2 and paint B to paint
C is 1:2. Paint A costs shs. 180 per litre, paint B shs. 240 per litre and paint C shs. 127.50
per litre and paint C shs. 127.50 per litre.
(a) The volume of each type of paint in the mixture. (5 marks)
(b) The amount of money spent in making one litre of the mixture. (3 marks)
(c) The percentage profit made by selling the mixture at shs. 221 per litre.
(2 marks)

10 marks

18.

The figure below is a solid frustum of a rectangular base ABCD and top rectangular
EFGH. Given that AB = 6cm, AC = 10cm, HF = 5cm, FG = 4cm and CF =25cm. Calculate:
(a) The height of the pyramid it was cut from giving your answer to the nearest
whole number. (2 marks)
(b) The surface area of the frustum. (5 marks)
(c) The volume of the frustum. (3 marks)

10 marks

19.

(a) Complete the table below for the function 𝑦𝑦y = 1/2sin 2𝑥x where 0o ≤ 𝑥x ≤ 360o. (2 marks)

 x 0o 30o 60o 90o 120o 150o 180o 210o 240o 270o 300o 330o 360o 2x 0o 60o 120o 180o 240o 300o 360o 420o 480o 540o 600o 660o 720o sin 2x 0o 0.866 ‍ 0 ‍ ‍ ‍ ‍ 0.866 0 ‍ ‍ ‍ y =½ sin 2x 0 0.433 ‍ 0 ‍ ‍ ‍ ‍ ‍ ‍ ‍ ‍ ‍

(b) On the grid provided, draw the graph of the function 𝑦𝑦y =½ sin 2x𝑥 for 0o ≤ x𝑥 ≤ 360o using the scale 1 cm for 300 on the horizontal axis and 4cm for 1 unit of y-axis. (3 marks) (c) Use your graph to determine the amplitude and period of the function y =½ sin 2. (2 marks)
(d) Use the graph to solve;
(i) ½sin 2x𝑥𝑥 = 0 (1 mark)
(ii) ½ sin 2x𝑥− 0.5 = 0 (2 marks)

10 marks

20.

Using a ruler and a pair of compass only; Construct rectangle ABCD whose sides are
AB = 10cm and BC = 7cm.
Use the figure to:
(a) Find the point R and S on AD and DC respectively, such that R is equidistant
from AD and S is equidistant from DC. (2 marks)
(b) Shade the region within the rectangle in which a variable point X must lie given
that X satisfies the following conditions.
(i) X > 2𝑐𝑐𝑐𝑐 from RS (3 marks)
(ii) X is nearer to AB than to BC (3 marks)
(iii) BX is more than 5cm (2 marks)

10 marks

21.

A youth group decided to raise ksh. 480,000 to buy a piece of land costing ksh. 80,000
per hectare. Before the actual payment was made, four of the members pulled out and
(a) If the original number of the group members was X, write down;
(i) An expression of how much was contributed originally. (1 mark)
(ii) An expression of how much the remaining members were to contribute
after the four pulled out. (1 mark)
(b) Determine the number of members who actually contributed towards the
purchase of the land. (4 marks)
(c) Calculate the ratio of the supposed original contribution for the new
contribution. (2 marks)
(d) If the land was sub-divided equally, find the size of land each member got.
(2 marks)

10 marks

22.

A train moving at 40km/h is moving in the same direction with a truck on a road
parallel to the railway line at a speed of 75km/h. The truck takes 1 ¼ min to overtake
the train completely.
(a) Given that the truck is 5m long. Determine the length of the train in metres.
(6 marks)
(b) The truck and the train continued moving parallel to each other at the original
speeds. Calculate the distance between them after 10 mins 15 sec from the time
the truck overtook the train. (2 marks)
(c) The truck stopped 50 minutes after overtaking the train. How long did the train
take to catch up with the truck? (2 marks)

10 marks

23.

(a) Given that the position vectors of A, B and C are; Find;
(i) AC (1 mark)
(ii) AB (1 mark)
(iii) BC (1 mark)
(b) In the figure below, OR = 5a, OP = 5b, and PQ = 2a – b (i) Express as simply as possible, vectors OQ and RQ in terms of a and b.
(2 marks)
(ii) Given that line PQ produced meet at X and that PX = k PQ and
OX = h OR where k and h are constants; form an equation connecting k,
h, a and b. Hence deduce the values of k and h. (5 marks)

10 marks

24.

Mr. Kamau earns a basic salary of ksh. 30,000 per month. He gets medical allowance of
ksh. 4000 per month. He occupies a company house for which he pays a nominal rent
of ksh. 1000 per month. He enjoys a tax relief of ksh. 600 per month. The following
PAYE is in operation.

 Income K£ P.a. 0 – 3600 3601 – 7200 7201 – 10800 10801 – 14400 14401 – 18000 18001 and over Rate of tax in Ksh. (£) 2 3 5 7 9 10

(a) Calculate Kamau’s taxable income in Kenya pounds per annum. (3 marks)
(b) Calculate Kamau’s PAYE in Kenya shillings per month. (4 marks)
(c) In addition to the PAYE the following deductions were made on his salary every
month.
(i) WCPs at 2% of basic salary
(ii) NHIF of ksh. 300
(iii) Cooperatives shares and loan recovery totaling ksh. 2,500 per month.
Calculate Kamau’s net pay in ksh. per month. (3 marks)

10 marks