Physics XI Karachi Board True and False - Five Year Papers

Five Year Papers
1. There is no difference between the rotatory motion and the circular motion.

2. The velocity of sound waves increases with temperature.

3. The stationary waves are produced due to the superposition of two identical waves travelling in opposite directions.

4. The interference and diffraction patterns are exactly the same

5. In an elastic collision, energy is conserved but not the momentum.

6. In an inelastic collision, momentum is conserved but not the momentum.

7. A free vector is one, which can change its direction.

8. The objects falling freely to the earth move in the same direction.

9. The real images formed by a convex lens are always inverted and on the same side of the lens as the object.

10. A body possesses potential energy only when it exists in the earth’s or some other body’s gravitational field.

11. The moon is freely falling to the earth.

12. An astronaut in a spacecraft experiences weightlessness because the earth’s gravitational force ceases to act on him.

13. Both the centre of mass and centre of gravity of a body are at one and the same point in a uniform gravitational field.

14. Sound waves cannot be polarized.

15. If two tuning forks 100 Hz and 120 Hz are sounded together the number of beats heard per second will be 20.

16. It is not possible to photograph a virtual image.

17. The motion of an airforce soldier descending with a parachute is a free fall motion.

18. There is no effect of the change of temperature on the velocity of sound.

19. Work done in a gravitational field is independent of the path.

20. The image formed by a convex lens for the different positions of the object is always real.

21. An inelastic collision is thath in which the momentum and the kinetic energy are conserved.

22. An oscillatory motion in which the acceleration is proportional to the force is called a simple harmonic motion.

23. The time period of a pendulum depends on the length of the pendulum.

24. Weightlessness is overcome in spacecraft by creating artificial gravity.

25. Beats are produced due to the superposition of two waves of the same frequency.

26. One of the conditions for interference of light is that the sources of light must be in phase coherence.