General Science

1. Which of the following changes can be brought about by the, application of a force ?

a. Change in the state of rest of a body.

b. Change in the state of motion of a body.

c. Both of these.

d. None of these.

2. What is the physital principle involved in skating ?

a. Action and reaction are equal and opposite.

b. Law of conservation of momentum.

c. Law of conservation of energy.

d. Law of conservation of mass.

3. When a ball is set rolling on the ground, it stops after, sometimeWhich of the following opposes the motion of the ball ?

a. Resistance due to air.

b. Force of friction between the ball and the ground.

c. Both of these.

d. None of these.

4. Why does a ship made of steel float though a steel ball sinks

a. Because ship is propelled by an engine,.

b. In the case of ship. action and reaction are equal and opposite whereas in,case of ball action is greater than reaction.

c. The force of gravitation between the earth and the ship is ,enough to keep ship stable. In the case of ball, this force is so. small ~that the ball cannot be stable.

d. Because weight of water displaced by a ball is less than its own weight, while the weight of water displaced by a ship is greatm than its own weight.

5. A rocket works on the principle of

a. Conservation of mass.

b. conservation of momentum.

c. conservation of energy.

d. conservation of charge.

6. The total quantity of motion contained in a body is given by its

a. speed.

b. velocity,

c. momentum.

d. mass.

7. Why a hydrogen balloon rises ?

a. Because hydrogen is lighter than air,

b. Because hydrogen is endowed with the property of rising vertically upwards.

c. Because hydrogen is attracted by the moon.

d. Because hydrogen is attracted by the sun.

8. A light year is a unit of

a. time.

b. distance.

c. velocity.

d. intensity of light.

9. Why a passenger standing in a bus falls backward when'the bus is suddenly set in motion ?

a. Because action and reaction are equal and opposite.

b. Because, in this case, the action becomes greater than the reaction.

c. Because, in this case, the reaction is greater than the action.

d. Because the lower part of the body begins to move along with the bus while the upper part (of the body) tends to remain at rest due to inertia of rest.

10. A stone, tied to a string, is being whirled round in a horizontal circle. The string suddenly breaks. What will be the motion of ther stone ?

a. The stone will continue to move in a circle fbr sometime.

b. The stone will fly off, in a straight line path, along the tangent.

c. The stone will immediately fall to the ground.

d. The stone will first move, along the radius of the circle, to the centre of the circle and finally drops to the ground.