2010 KCSE PHYSICS TRIAL P1-001

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# PHYSICS

**Paper 1**

**(Theory)**

**July/August 2010**

**2 hours **

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**RARIEDA DISTRICT JOINT EVALUATION TEST – 2010**

*Kenya Certificate of Secondary Education (K.C.S.E)*

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# PHYSICS

**Paper 1**

**(Theory)**

**July/August 2010**

**2 hours **

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**INSTRUCTIONS TO CANDIDATES.**

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- Write your name and index number in the spaces provided above
- Sign and write the date of examination in the spaces provided above.
- This paper consists of Two sections: A and B.
- Answer all the questions in section A and B in the spaces provided
- All working must be clearly shown.
- Mathematical tables and electronic calculators may be used.
- Take acceleration due to gravity g = 10m/s
^{2}

**FOR EXAMINERS USE ONLY.**

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SectionQuestionMaximum scoreCandidate’s scoreA1-1425

B15121612171118101910Total score80

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*This paper consists of 12 printed pages.*

*Candidates should check the question paper to ensure that all pages are printed as indicated*

*and no questions are missing*

**Section a (25 marks)**

*Answer all questions from this section in the spaces provided after each question.*

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Figure 1 shows a Vernier caliper being used to measure the diameter of a cylindrical metal of mass 18g and length 20cm. The reading on the caliper when the jaws were fully closed without the metal was -0.11cm. Use this information and the figure to answer questions 1 and 2.

1. What is the diameter of the cylindrical metal? (1mk)

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2. Determine the density of the cylindrical metal. (2mks)

3. Figure 2(a) shows a table tennis ball hanging close to a water tap. When the tap is opened so that the water flows, the ball is attracted to the stream as shown in figure 2(b)

Explain this observation. (2mks)

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4. Figure 3 shows a spiral spring fixed on a bench vertically. A mass of 0.5kg is placed on top as shown in the figure below.

In (a) the height, h_{o}, of the spring is 6cm while in (b) the height is 4cm. find the energy stored in the spring in figure 3(b) (2mks)

5. (a) State the Pascal’s principle. (1mk)

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(b) If the cross-sectional area of the output piston in a hydraulic device is ten times that of the input pistons area, by how much will the device multiply the input force? (1mk)

Figure 4 shows a desk lamp. The lamp has small holes near the top of the metal lampshade. The inner surface of the lampshade is also whitened. Use this information to answer questions 6 and 7.

6. Explain why the inner surface of the lampshade is whitened. (1mk)

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7. State the purpose of the small holes near the top of the metal lampshade. (1mk)

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8. Figure 5 shows glasses resting on an incline. One glass is empty while the other one is filled with water.

Which glass is more unstable and will topple? Explain (2mks)

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9. Two beakers contains equal volumes of water and ethanol. A crystal of potassium permanganate is placed in the liquids at the bottom of each of the beakers. In which beaker will the diffusion be faster given that the two liquids are at the same temperature? Explain. (2mks)

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10. Figure 6(a) shows the momentum-time graph for a certain motion.

On the axes provided in figure 6(b), sketch the acceleration time graph for the same motion.(1mk)

11. Figure 7 shows a test tube with a sliding fitting cork balanced horizontally.

Explain why the test tube turns anti-clockwise when it is heated slightly. (2mks)

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12. A solid of mass 100g and density 2.5g/cm^{3} weighs 0.5N when totally submerged in a liquid. Determine the density of the liquid. (3mks)

13. An air bubble expands as it rises to the surface of water in a deep pond. Sate the cause of this given that the temperature remains constant. (1mk)

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14. A ball of mass 200g is attached to one end of a string and whirled round a vertical circle of radius 1m once every second. Calculate the maximum tension on the string. (3mks)

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**Section b (55mks)**

*Answer all questions in this section in the spaces provided.*

15. (a) Figure 8 shows a roller coaster rolling on a track. The speed of the roller coaster at point A

is 5.0m/s

(i) What is the speed of the roller coaster at B? (3mks)

(ii) What speed at A is required for the roller coaster to reach point C? (3mks)

(b) A girl swings back and forth on a swing whose ropes are 4.00m long. The maximum

height she reaches is 2.00m above the ground. At the lowest point of the swing, she is

0.500m above the ground. What is the girl’s maximum speed and where does she

attain it? (3mks)

(c) An oil drop of average diameter 0.7mm spreads out into a roughly circular patch of

diameter 75cm on the surface of water in a trough. Calculate the average diameter of a

molecule of oil. (3mks)

16. (a) State Charles law for an ideal gas. (1mk)

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(b) Figure 9 shows a type of constant volume gas thermometer.

Describe how it operates. (3mks)

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(c) The graph in figure 10 shows the relationship between the product of pressure and volume

(pv) and the absolute temperature for a given mass of a gas. From the graph determine;

(ii) The volume that the fixed mass of the gas would occupy at a temperature of -248^{0}C and a

pressure of 104kPa. (3mks)

(iii) The pressure necessary for 40 litres of the gas to attain a temperature of 0^{0}C. (3mks)

17. (a) Define the term mechanical advantage of a machine. (1mk)

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(b) Figure 11 shows a pulley system being used to raise a load.

This pulley system has an efficiency of 75%.

(i) Determine the velocity ratio of the system. (1mk)

(ii) Calculate the mechanical advantage of the pulley system. (2mks)

(iii) What effort is required to raise a load of 240kg? (2mks)

(iv) Calculate the work done by a person using this machine in raising a load of 120kg through

a vertical distance of 2.5m (3mks)

(c) Give two reasons to explain why the efficiency of a machine cannot be 100%. (2mks)

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18. Figure 12 shows the pattern formed on a tape in an experiment to determine the acceleration of a trolley. The figure is drawn to scale. The frequency of the ticker tape timer used was 50Hz.

Calculate

(i) The initial velocity of the trolley. (2mks)

(ii) The final velocity of the trolley (2mks)

(iii) The acceleration of the trolley. (2mks)

(b) A gun is fired vertically upwards from the top of an open truck moving horizontally at a

uniform velocity of 50ms^{-1}. The bullet attains a maximum height of 45m. calculate the

distance covered by the truck just before the bullet reaches the level from which it was

fired. (4mks)

19. (a) State any three properties of an ideal fluid. (3mks)

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(b) A car of mass 800kg is initially moving at 20m/s. calculate the force needed to bring the

car to rest over a distance of 100m. (2mks)

(c) Distinguish between perfect elastic collision and perfect inelastic collision. (1mk)

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(d) Figure 13 shows a plastic egg supported vertically by a stream of air from a tube.

Explain why the egg will not move away from the midstream position. (2mks)

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(e) Give two examples of devices in which Bernoulli’s effect is applied. (2mks)

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**END**