Get premium membership and access revision papers, questions with answers as well as video lessons.

Got a question or eager to learn? Discover limitless learning on WhatsApp now - Start Now!

Physics Form Four Question Paper

Physics Form Four

Course:Physics

Exam Year:2006

FRIENDS SCHOOL KAMUSINGA
KIMILILI

FORM 4 PHYSICS
TERM 3 CAT 1 2006

1. A spring stretches by 6cm when supporting a load of 15 N. Determine the energy stored. (3 marks)

2. Show that pressure in a fluid is given by P=h g (4 marks)

3. A part from altitude state three other factors that affect the magnitude of the force of gravity of a place. (3 marks)

4. A car moving at 15m/s is brought to rest after the driver applies emergency brakes with a force of 800N. If the car has a mass of 1000kg and the driver has a reaction time of 0.8 seconds, determine the total distance covered before the car is bought to rest. (5 marks)

5. A 2.5kw electric kettle contains 1kg of water at 200C. How long would it take for the water to boil. Explain why it is likely to take longer than the time calculated.
(Specific heat capacity of water = 4200 J/kg k). (4 marks)

6. an object placed at the bottom of two optical media A and B is viewed as shown below.

Eye

15cm n=4/3

10cm n=3/2

Object

Complete the diagram to show how the eye sees the image of the object. (3 marks)

7. The diagram below shows two masses of 5kg and 3kg connected by an inextensible string which passes over a pulley.

Determine the acceleration of the system when the 5kg mass is released. (4 marks)

8. A refrigerator converts 500kg of water at 200C into ice at 00C in 2 hours. What is the rate at which energy is extracted from water? (Specific heat capacity of water = 4200J/kg k, specific latent heat of fusion of ice = 366J/g). (4 marks)

9. (a) Where must an object be placed with respect to a concave mirror of focal length 15 cm to give an erect image which is magnified 3 times? (3 marks)

(b) Explain with the help of diagrams why a convex mirror is preferred over a plane mirror as driving mirror. (4 marks)

10. State one factor that determines the M.A and one factor that determine the V.R of a machine. (2 marks)

11. A 2µf capacitor is charged by an 80V supply and then connected a cross an uncharged 20µF capacitor. Calculate the final p.d a cross each capacitor. (4 marks)

12. The diagram below shows a transverse wave produced when one end of a rope was jerked up and down.

Disp(cm)

Time (sec)
Sketch on the same diagram the wave form of the wave when the frequency and amplitude are doubled. (4 marks)

13. Four identical resistors are connected to 12V battery of negligible resistance as shown in the figure below.

12V

Determine the reading of voltmeters V1 and V2 (4 marks)

14. (a) Define the following terms
i. specific heat capacity (1 mark)

ii. specific latent heat of fusion. (1 mark)

b. A copper calorimeter of mass 70.5g contains 100g of water at 19.50C . Naphthalene (melting point 79.90C) is melted in a test tube, cooled to 800C and then poured into the calorimeter. If the highest temperature reached by the water after stirring is 28.70C and the final mass of the calorimeter and its contents is 188.3g, calculate the specific latent heat of fusion of naphthalene.
(Take:- specific heat capacity of copper = 400J/kgk,
specific heat capacity of Nephthalene = 1300J/kgk,
specific heat capacity of water = 4200J/kgk) (8 marks)

15. (a) (i) State the law of conservation of linear momentum. (1 marks)

(ii) Distinguish between elastic and inelastic collisions. (2 marks)

(b) A bullet of mass 22g traveling horizontally with a velocity of 300m/s strikes a block of wood of mass 1978g which rests on a rough horizontal floor. After the impact the bullet and the block move together and come to rest when the block has traveled a distance of 5m. calculate the coefficient of sliding friction between the block and the floor. (8 marks)

16. A stone is dropped from a building 30 m high and at the same time another stone is thrown vertically upwards from the ground at 20 m/s. Determine
i. The time taken for the two stones to meet (4 marks)

ii. The height above the ground when the two stones meet. (2 marks)

17. (a) A milliameter of resistance 50O gives a full scale desfletion when current of 10mA flows. How can it be adapted to read.
i. 1A (3 marks)

ii. 10V (3 marks)

b. In an experiment to determine the internal resistance of a cell the following results were obtained.

R O 0.7 2.5 5.5 6.5
I(A) 5.0 2.0 1.0 0.86

(i) Outline a brief procedure for this experiment. (3 marks)

(ii) Complete the table for the values of 1/I (3 marks)

(iii) Plot the graph of 1/I against R (x-axis) (4 marks)

(iv) Using your graph determine the values of E and r given that E=I(R+r). (4 marks)

18. In the diagram below AB is a ray that is very close and parallel to the principal axis of a concave mirror.

B

F
Concave mirror

Where F = focal point

By completing the path of AB on striking the mirror show that f=R/2 where f is the focal length and R is the radius of curvature of the mirror. (3 marks)

Physics Form Four Question Paper

More Question Papers

Popular Exams