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KCSE Physics PAPER 1 2014 with Answers
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Kenya Certiﬁcate of Secondary Education Physics Past Paper
KCSE Physics Paper 1 2014
Physics KCSE 2014 Questions and Answers
PHY paper 1
SECTION A: (25 marks)
Answer ALL the questions in this section in the spaces provided.
1 A student measured the length of a wire four times using a metre rule and obtained the following readings: 18.6 cm; 18.5 cm; 18.6 cm and 18.5 cm. Determine the length the student should record. (2 marks)
2 Figure 1 shows a magniﬁed scale of a micrometer screw gauge.
Record the reading indicated. (1 mark)
3 State the reason why it is not correct to quote the weight of solid objects in kilograms. (1 mark)
4 Figure 2 shows a section of a curved surface ABCD. Point A is higher than point B while BCD is horizontal. Part ABC is smooth while CD is rough. A mass m is released from rest at A and moves towards D.
State the changes in the velocity of m between:
(a) B and C; (1 mark)
(b) C and D. (1 mark)
5. Figure 3 shows two cylinders of different cross-sectional areas connected with a tube. The cylinders contain an incompressible ﬂuid and are ﬁtted with pistons of cross-sectional areas 4 cm2 and 24 cm2.
Opposing forces P and Q are applied to the pistons such that the pistons do not move. if the pressure on the smaller piston is 5 N cm’. Determine force Q. (2 marks)
6. An oil drop of volume V m’ introduced on the surface of water spreads to form a patch whose area is A ml. Derive an expression for obtaining the diameter, d of a molecule of oil. (2 marks)
7. Figure 4 shows a source of heat placed at equal distances from two identical ﬂasks X and Ycontaining air. The surface of X is painted black while Y 1S clear.
X and Y are linked by a U-tube ﬁlled with water whose levels S and T are initially the same. It is later observed that S falls while T rises. Explain this observation. (2 mark)
8. Figure 5 shows a uniform rod 4 m long and of mass 2 kg. It is pivoted 1 m from one end and balanced horizontally by a string attached near the other end.
Determine the position where a mass of 5 kg should be placed on the rod so that the rod remains horizontal and the tension in the string is Zero. (3 marks)
9. Figure 6 shows two identical rods JK and LKconnected with a hinge at K. imageeee The position of the centre of gravity for the system is at P. The arrangement is now adjusted so that J and L move equal distances towards O. Sketch the new arrangement on the same diagram and mark the new position of the centre of gravity. (2 marks)
10. A light spiral spring extends by 4 mm when loaded with a weight W. The spring is connected in series with an identical spring. The combination is loaded with the weight W. Determine the extension of the combination. (2 marks)
11. Figure 7 shows an incompressible ﬂuid ﬂowing through a pipe, AI and AZ are the cross-sectional areas of the pipes in the larger section and smaller section of the pipe respectively, while V1 and V2 are speeds of the ﬂuid at the two sections of the pipe.
Derive an expression for the ratio of the speeds % in terms of AI and A2. (2 marks) 12 On the axis provided, sketch the graph which shows the relationship between volume and temperature of a ﬁxed mass of water in the temperature range 0°C to 10°C. (1 mark)
13 Figure 8 shows a graph of the variation of temperature with time for a pure substance heated at a constant rate.
Assuming that heat transfer to the surroundings is negligible, state the changes observed on the substance in region:
(a) BC; (1 mark)
(b) DE. (1 marks)
14 In a smoke cell experiment to demonstrate Brownian motion, smoke particles are seen moving randomly. State the cause of the randomness. (1 mark)
SECTION B: (55 marks)
Answer all the questions in this section in the spaces provided.
15 Figure 9 shows a velocity-time graph for the motion of a body of mass 2 kg.
(a) Use the graph to determine the:(3 marks)
(i) displacement of the body after 8 seconds.(3 marks)
(ii) acceleration after point B;(3 marks)
(iii) force acting on the body in part (a) (ii).(2 marks)
(b) Sketch a displacement-time graph for the motion from point A to C.
16 Figure 10 shows a trolley of weight 20 N pulled by a force of 4 N from the bottom to the top of an inclined plane at a uniform speed.
(a) (i) State the value of the force acting downwards along the inclined plane.(1 mark)
(ii) Explain how the value in pan (a) (i) is obtained.(2 marks)
(b) For the system, determine the:
(i) mechanical advantage; (3 marks)
(ii) velocity ratio; (3 marks)
(iii) efficiency. (2 marks)
17 (a) A long horizontal capillary tube of uniform bore sealed at one end contains dry air trapped by a drop of mercury. The length of the air column is 142 mm at l7°C. Determine the length of the air column at 25°C. (3 marks)
(b) The pressure of the air inside a car tyre increases if the car stands out in the sun for some time on a hot day. Explain the pressure increase in terms of the kinetic theory of gases. (3 marks)
(c) In an experiment to determine the speciﬁc latent heat of vapourization of water, steam of mass 10 g at 100°C is passed into 100 g of Water initially at 20°C in a container of negligible heat capacity. The temperature of the Water rises to 70°C.
(Take the speciﬁc heat capacity of water as 4.2 >< 10“ J kg” K” and the boiling point of water as 100°C)
(i) Determine the speciﬁc latent heat of vapourization of water. (4 marks)
(ii) State two sources of error in this experiment. (2 mark)
18 (a) When a bus goes round a bend on a ﬂat road, it experiences a centripetal force.
State what provides the centripetal force. (1 mark)
(b) State the purpose of banking roads at bends. (1 mark)
(c) A student Whirls a stone of mass 0.2 kg tied to a string of length 0.4 m in a vertical plane at a constant speed of 2 revolutions per second.
(Take acceleration due to gravity g as 10 ms’)
(i) State two forces acting on the stone when it is at the highest point. (2 marks)
(ii) Determine the:
i angular velocity of the stone; (3 marks)
ii tension in the string when the stone is at the highest point; (3 marks)
19 Figure 11 shows a test—tube whose cross-sectional area is 2 cmz partially ﬁlled with lead shot ﬂoating vertically in water.
(Take gravitational acceleration as I O ms’ and density of water ,Ow as I g cm”) (a) (i) Determine the:
l volume of the water displaced; (2 marks)
ll weight of water displaced. (3 marks)
(ii) State the combined weight of the test—tube and the lead shot. (1 mark)
(iii) Determine the length of the test—tube that would be submerged in a liquid of density 0.8 g cm’3. (4 marks)
(b) The set up in ﬁgure 11 can be used as a hydrometer to measure densities of liquids.
State how such a hydrometer would be improved to measure small differences in densities of liquids. (1 mark)
KCSE Physics Paper 1 2014 Questions and Answers
KCSE Physics Marking scheme Paper 1 -- PHY paper 1
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KCSE Physics Paper 2 2014
KCSE Physics Paper 3 2014
->> Here are the KCSE Physics Paper 3 2014 exams that are available
You are provided with the following:
a metre rule
3 optical pins
2 small wooden blocks
a stop watch
a stand, a boss and clamp
a piece of sellotape
Proceed as follows:
a) Using the two wooden blocks, clamp two optical pins about 4 cm apart in the stand so that they project out of the blocks in a horizontal plane.
(b) Using a piece of sellotape, attach the third optical pin across the metre rule at a distance x = 1O cm from the 50 cm mark. Now suspend the metre rule on the two clamped pins so that it can swing freely in a vertical plan with the third pin as the axis. (See ﬁgure 1)
(c) Displace the lower end of the metre rule slightly and let it oscillate as shown in the ﬁgure 1.
Measure and record in table l the time t(s) for 20 oscillations. (Correct to one decimal place).
(d) (i) Repeat the procedure in (b) and (c) for the values of X shown in table 1.
(ii) For each value of x shown in the table, determine the period T(s), correct to two decimal places, and complete the table. (The period T is the time for one complete oscillation).
(e) On the grid provided, plot a graph of T2X(y-axis) against X2 (origin not required). (5 marks)
(f) From the graph, determine:
(i) the slope S of the graph. (3 marks)
(ii) the value of constant r given that:
rS = 39.5 (2 marks)
You are provided with the following:
-- a converging mirror
-- a rectangular piece of manilla paper
-- a half meter rule
-- a stand, boss and clamp
-- a dropper
-- liquid Q
Proceed as follows:
(g) (i) Using the wooden blocks clamp the manilla paper in the stand so that it projects out of the blocks in a horizontal plane, about 30 cm above the bench.
(ii) Place the mirror on the bench so that its centre is vertically below the free end of the manilla paper.
(h) With your eye vertically above the free end of the manilla, observe its inverted diminished image appearing as in ﬁgure 2.
(i) Now adjust the height of the manilla vertically above the centre of the mirror until its width and that of the inverted image are equal as in ﬁgure 3.
Measure and record the distance L1 between the manilla paper and the bench. L1 = …………………….. ..cm (1 mark)
(j) Using the dropper provided put some liquid Q on the mirror so that its surface is about 3 cm in diameter. Repeat part (i). Measure and record the distance L2 between the manilla paper and the bench. L2 : ……..cm (1 mark)
(k) Determine constant k given that:
L1 = kL2 (2 marks)
You are provided with the following:
four 10 Q resistors
a resistance wire labelled S mounted on a half metre rule
a resistance wire AB mounted on a metre rule
two dry cells and a cell holder
a centre zero galvanometer G
8 connecting wires each with a crocodile clip at one end
a micrometer screw gauge
(a) Set up the circuit as in ﬁgure 4 in which R is nearA and S is near B. (R is a 10 Q resistor or an appropriate combination of 10-ohm resistors).
(b) Starting with a single 10 Q resistor as R, close the switch. Using the jockey tap wire AB brieﬂy near end A and observe the deﬂection on the galvanometer. Now tap the wire near end B and again observe the deﬂection of the galvanometer. (The two deﬂections should be in opposite directions)
(c) Still with the 10 Q resistor as R, tap at various points along wire AB to obtain a point P at which the galvanometer shows zero deﬂection. Measure and record in table 2 the length L (m) between A and P. (Record L correct to 3 decimal places)
(d) Repeat part (c) to obtain L for other values of R shown in table 2. (6 marks)
(i) 1/L for all the values of L correct to 2 decimal places. (1 mark)
(ii) 1/R for all values of R correct to 3 decimal places. (1 mark)
On the grid provided, plot a graph of 1/L (y-axis) against 1/R (origin not required). (5 marks)
(i) Determine the slope n of the graph. (3 marks)
(ii) State the unit of n. (1 mark)
Using the micrometer screw gauge, measure and record the diameter D of wire S in metres. D : …………………………. .. m. (1 mark)
Determine the value of constant k given that 4k=rnD2n(3 marks)
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