41. The inner diameter of a small test tube can be measured accurately using a
- A. Micrometres screw gauge
- B. Pair of dividers
- C. Metre rule
- D. Pair of vernier calliper
42. A pulley system has three pulleys in the fixed block and two in the movable block and if the pulley has an efficiency of 72%, the mechanical advantage of the system is?
- A. 36.0
- B. 7.2
- C. 5.0
- D. 3.6
43. When an atom loses or gain a charge it becomes
- A. An electron
- B. An ion
- C. A neutron
- D. A proton
44. A ball of mass 800g moving horizontally with a speed of 5m/s hits a vertical wall and rebounds with the same speed. The impulse experienced by the ball is?
- A. 0kgm
- B. 2kgm/s
- C. 4kgm/s
- D. 8kgm/s
45. The force between the molecules of a liquid in contact with that of a solid is?
- A. Adhesive
- B. Cohesive
- C. Magnetic
- D. Repulsive
46. A body of mass 100g moving with a velocity if 10ms-1 collides with a wall. If after collision it moves with a velocity of 2.0ms−1 in the opposite direction, calculate the change in momentum.
- A. 0.8Ns
- B. 1.2Ns
- C. 12.0Ns
- D. 80.0Ns
47. A 20kg mass is to be pulled up a slope inclined at 30° to the horizontal. If efficiency of the plane is 75%. The force required to pull the load up the plane is J [g=10ms−2]
- A. 87N
- B. 73.5N
- C. 133.3N
- D. 533.2N
48. The tendency of a body to remain at rest when a force is applied to it is called.
- A. Impulse
- B. Momentum
- C. Inertia
- D. Friction
49. An object is placed 20cm from a concave mirror of focal length 10cm. The linear magnification of the image produced is?
- A. 0
- B.
- C. 1
- D. 2
50. The energy needed to move a unit positive charge around a complete electric circuit is called the
- A. electromotive force
- B. electric potential difference
- C. electric energy
- D. kinetic energy
