A body moving at constant velocity on a horizontal plane has a number of unequal forces acting on it. Which one of the following is true?
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- (A) Atleast two of the forces must be acting in the same direction.
+ (B) The resultant force is zero.
- (C) Friction between the body and the Horizontal plane is the resultant force.
- (D) The vector sum of the forces causes the causes the body's velocity to increase.
{When a lamp is connected to a 220V source, the power dissipated is P. The same lamp is connected to a 110V source. Assuming that the resistance of the lamp remains constant, which one of the following is the new power dissipated?
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- (A) 0.
- (B) .
+ (C) .
- (D) P.
{
In the circuit shown, switch S is closed and internal resistance of the battery is negligible.
How will the Ammeter and the Voltmeter readings respectively be affected if switch S is opened?
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- (A) Increase ; Decrease
- (B) Decrease ; Decrease
- (C) Increase ; No change
+ (D) Decrease ; No change
{
A car travels along a straight road. Due to an oil leak spilling at a constant rate the following pattern of oil drops is formed on the road.
During which sections did the car travel faster?
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- (A) AB & EF
+ (B) BC & EF
- (C) CD & GH
- (D) AB & BC
{
You are standing in a train carriage moving west towards your metro station. The train suddenly brakes. You will continue to move westwards due to ...
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- (A) The inertia of the train.
+ (B) Your inertia.
- (C) The sum of the above inertias.
- (D) The braking force on you.
{
Betty and Cindy each weigh 100kg and 110kg respectively on earth. They both fly to the moon on board NASA space shuttle. On-board the shuttle, their weights are measured again. Which of the following readings are the most probable results?
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- (A) Betty: 100kg ; Cindy: 110kg
- (B) Betty: 200kg ; Cindy: 220kg
+ (C) They are weightless.
- (D) None of the above
{
Betty and Cindy are now taken to the moon. On the moon their weights are measured again. Which of the following readings are the most probable results?
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- (A) Betty: 100kg ; Cindy: 110kg
+ (B) Betty: 16.7kg ; Cindy: 18.3kg
- (C) Betty: 200kg ; Cindy: 220kg
- (D) None of the above
{
A negatively charged rod is brought near two neutral conducting spheres P & Q mounted on insulated stands as shown.
P & Q are separated and afterwads the rod is removed. what will be the final charges on P & Q respectively?
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- (A) P: Negative ; Q: Negative
+ (B) P: Positive ; Q: Negative
- (C) P: Neutral ; Q: Neutral
- (D) P: Positive ; Q: Neutral
{
Two current carrying conductors are installed in parallel as shown.
Conductor X experiences a force F. The magnitude and direction of the force which will be experienced by conductor Y is?
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+ (A) Magnitude: F ; Direction: Repulsive
- (B) Magnitude: 3F ; Direction: Repulsive
- (C) Magnitude: 3F ; Direction: Attractive
- (D) Magnitude: F ; Direction: Attractive
{
Two trolleys, A(3Kg) and B(6Kg) are attached to each-other by an elastic band as shown.
They are pulled apart and held at rest on a horizontal friction-less surface. After they are released , they move towards each other and collide. After the collision the trolleys will ...
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- (A) Move to the left and stop.
+ (B) Move to the left at constant speed.
- (C) Stop.
- (D) Move to the right at constant speed.
{
Which of the following statements is a correct summary of the Newton's third law of motion?
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+ (A) For every action , there is an equal and opposite reaction.
- (B) The resultant force in a closed system is zero.
- (C) Kinetic energy is conserved in an elastic collision.
- (D) None of the above.
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