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Practice MCQ Questions and answers on Physics-GK

Learn and practice General Knowledge questions and answers on Physics with very easy and understandable explanations. GK questions are very helpful different type of competitive exams. Page-6 section-4

Each section contains 100 MCQs on Physics .
51
When a body falls from an aeroplane, there is increase in its
Discuss
Answer & Solution
Answer: Option C
Solution:
The energy possessed by a body by virtue of its motion is called kinetic energy. Potential Energy is the energy possessed by virtue of its position or configuration. When a body falls from an aeroplane, there is increase in its acceleration.
52
Which of the following never occurs singly in nature?
Discuss
Answer & Solution
Answer: Option C
Solution:
According to Newton, force can never occur singly in nature; it is the mutual interaction between two bodies. This formed the basis of Newton's Third Law of motion which states: “To every action, there is always an equal and opposite reaction.” Forces always occur in pairs.
53
The moment of inertia of a body does not depend upon
Discuss
Answer & Solution
Answer: Option C
Solution:
Moment of inertia depends on distribution of body, axis of rotation and mass of the body. It is not dependent on angular velocity of the body.
54
Newton's first law of motion gives the concept of
Discuss
Answer & Solution
Answer: Option D
Solution:
Newton's first law of motion is sometimes referred to as the law of inertia. An object at rest stays at rest and an object in motion stays in motion with the same speed and in the same direction unless acted upon by an unbalanced force.
55
For every action, there is an equal and opposite reaction, is Newton's
Discuss
Answer & Solution
Answer: Option C
Solution:
For every action, there is an equal and opposite reaction, is Newton's third law.
56
Gravitational force is maximum at which place
Discuss
Answer & Solution
Answer: Option A
Solution:
Gravitational force is maximum at Poles. The gravitational force is almost equal in every where in the earth. The resultant force is maximum in pole.
57
A metal ball and a rubber ball, both having the same mass, strike a wall normally with the same velocity. The rubber ball rebounds and the metal ball does not rebound. It can be concluded that
Discuss
Answer & Solution
Answer: Option A
Solution:
As per the question, the rubber ball rebounds while the metal ball does not. So if m and v be the mass and velocity respectively, the change in momentum of rubber ball = 2 mv (in magnitude). However, the change in momentum of the metal ball = mv. The rubber ball suffers almost twice the change in momentum as experienced by the metal ball.
58
A boy sitting in an open car moving with the constant speed throws a ball straight up into the air. The ball falls
Discuss
Answer & Solution
Answer: Option A
Solution:
The moment ball is thrown, it is moving with the velocity of the car. According to the inertia of motion it will continue to move in the same direction with the same velocity. As the ball is moving up and the down it will maintain its forward motion but practically it is not possible to neglect the resistance caused by air friction. So, the ball will fall behind him. Inertia is the resistance of any physical object to a change in its state of motion or rest, or the tendency of an object to resist any change in its motion.
59
Rate of change of momentum is
Discuss
Answer & Solution
Answer: Option C
Solution:
The rate of change of linear momentum of a body is directly proportional to the external force applied on the body , and takes place always in the direction of the force applied.
60
Which law is also called law of inertia ?
Discuss
Answer & Solution
Answer: Option A
Solution:
Newton first law is called law of inertia.