# Physics - MCQs with answers - Part IV

## Physics - MCQs with answers - Part IV

Q1. A person travel from A to B and again he travel from B to A ,In this case what would be the correct answer:

a) Distance and displacement will be same.
b) Distance will be more than displacement.
c) Displacement will be more than distance.
d) Either distance will be more or displacement will be more.

ANSWER: b) Distance will be more than displacement.

Q2. The motion of a freely flowing body or object is in a.

a) Uniformly accelerated motion.
b) Non –uniform accelerated motion.
c) Both of them
d) None of these

Q3. Consider the following statements:

1. The change in the velocity could be due to change in its magnitude or direction of the motion.
2. When the velocity of an object changes it is observed that the object is accelerating.

Which of the above statement is correct:

a) 1 only
b) 2 only
c) Both 1 and 2
d) Neither 1 and 2

ANSWER: c) Both 1 and 2

Explanation-This is referred as Uniform circular motion.

Q4. To accelerate the motion of an object we required.

a) Balanced force
b) Unbalanced force
c) Frictional force
d) None of the above

Explanation-Balanced force do not change the motion of an object.In unbalanced force two opposite forces of different magnitude ,accelerate
the object in the direction of the greater force.

Q5. Safety belt in a car is used because.

a) It makes us sit tightly and thereby make us comfortable.
b) It exerts a force on our body to make the forward motion slow.
c) It makes driving easier with change in speed.
d) It is totally depend on our choice to use it or not while seated in a car.

ANSWER: b) It exerts a force on our body to make the forward motion slow.

Q6.In a high jump the athletes are made to fall either on a cushioned bed or on a sand bed. This arrangement is because _____ .

1. It increase the time of the athletes fall after making the jump.
2. It decrease the rate of change of momentum.
3. It decrease the rate of change of force.
4. It is based on Newton’s second law of motion.

Choose the correct options:

a) 1 and 2
b) 2 and 4
c) 3 only
d) All of the above.

ANSWER: d) All of the above.

Q7.Which of the following is true regarding the Newton’s third law of motion?

1. When one object exert a force on another object, the second object reacts back on the first object.
2. These two forces always unequal in magnitude but opposite in direction.
3. These two forces act on different objects.
4. These two forces act on same object.

a) 1 and 3
b) 2 only
c) 3 only
d) All of them.

Explanation- These two forces are always equal in magnitude but opposite in direction. They never act on the same object.

Q8. What do you understand by centripetal force?

1. It is a force acting away from the centre.
2. It is a force acting towards the centre.
3. It involves change in direction at particular interval.
4. It involves change in direction at every point.

Choose the correct options:

a) 1 and 2
b) 2 and 4
c) 3 and 4
d) 1 and 3

Explanation-Centripetal force concentrates only towards the centre .It does not change its direction at a particular interval .

Q9.When we hit a pile of carrom coins, at bottom coin moves out while the other coins fall vertically. It is due to _______.

a) Frictional force
b) Speed of carom striker
c) It is due to smoothness of carom board
d) It is due to inertia.

ANSWER: d) It is due to inertia.

Explanation-Inertia is a natural tendency of an object to resist a change in its state of motion.

Q10.Which of the following regarding the motion of the moon around the earth is correct?

1. It is due to centrifugal force.
2. It is due to centripetal force.
3. It is provided by the force of attraction of earth.
4. If there is no such force ,the moon would pursue a uniform straight line of motion.

a) 1 only
b) 2 and 3 only
c) 3 and 4 only
d) 2, 3 and 4 only.

ANSWER: d) 2, 3 and 4 only.

Explanation-The centrifugal force always act away from the centre. It will not provide any force of attraction .