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## Wednesday, September 14, 2011

### Sample paper 2011- 12 Science Physics &Chemistry

Section A (1 mark Questions)

1. What is the physical state of water ay 1000C?

2. Suggest a method to liquefy atmospheric gases

3. Which separation method will you apply to separate different pigment from extract of flower?

4. Under what condition(s) is the magnitude of average velocity of an object equal to its average speed?

5. What is the momentum of an object of mass m, moving with a velocity v?

Section B ( 2 marks Questions)

6. Distinguish between speed and velocity.

7. A man weight 600 N on the surface of moon What would we its mass and weight on the surface of Moon

8. Why is it advised to tie any luggage kept on the roof of a bus with a rope?

9. What is the nature of the distance-time graphs for uniform and non-uniform motion of an object?

10. A cyclist goes around a circular track once every 2 minutes. If the radius of the circular track is 105 metres, calculate his speed. (Given p = 22/7) Section C (3 marks Questions)

11. The brakes applied to a car produced an acceleration of 6 ms-2 in the opposite direction of the motion. If the car takes 2s to stop after the application of brakes, calculate the distance it travels during this time.

12. State Newton’s second law of motion and derive it mathematically?

13. What is a colloid? What are its various properties?

14. A solution contains 60g of NaCl in 400g of water. Calculate the concentration in term of mass by mass percentage of the solution.

15. A stone is dropped from a height of 50m on earth. At the same time, another stone is thrown vertically upwards from the ground with a velocity up wards from the ground with a velocity of 50m/s. At what height from the ground will the two stones meet (g = -10 m/s2)

Section D (5 marks Questions)

16. Two objects, each of mass 1.5 kg, are moving in the same straight line but in opposite directions. The velocity of each object is 2.5 m s-1 before the collision during which they stick together. What will be the velocity of the combined object after collision?

17. (i) Why is the weight of the object more at the poles than at the equator?

(ii) How is the angular velocity of a body moving along a circular path related to its linear speed?
18. What is distillation and fractional distillation? What is the basic property that separates the two methods?

19. Derive graphically the equation for position - time for relation for an object travelling a distance S in time t.

20. (1)What happen to the magnitude of force of gravitation between two object if:

(a) Distance between object is tripled

(b) Mass of both object doubled

(c ) Mass as well as distance between them is doubled

(ii) Derive relation between force and acceleration. Define one unit of force.

21. (1) State the law of conservation of momentum. Why is a person hit harder when he falls on a hard floor than when falls on sand from same height?

(ii) A bullet of mass 20gm fired horizontally with a velocity 100 m/s from a pistol of mass 1.5 kg. Calculate recoil velocity of pistol.