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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-5 section-4

Each section contains 100 MCQs on Physics .
41
An object at rest may have
Discuss
Answer & Solution
Answer: Option B
Solution:
An object at rest may have Potential energy.
42
Which conservation principle is applicable in the case of the motion of a rocket?
Discuss
Answer & Solution
Answer: Option C
Solution:
Rocket works on the principle of conservation of momentum. Rocket ejaculates gases in backward direction which creates momentum of the gases backwards and thus by conservation of momentum, the rocket gets a momentum in the forward direction making it to move forward.
43
Rocket works on the principle of
Discuss
Answer & Solution
Answer: Option A
Solution:
Rocket works on the principle of Newton's Third Law.
44
A passenger standing in a bus is thrown outward when the bus takes a sudden turn. This happens due to
Discuss
Answer & Solution
Answer: Option B
Solution:
Newton's 1st law of inertia states that an object will change its direction when a force is applied to it. Hence, when a bus takes a sudden turn the passengers are thrown outward. This is due to the inertia of direction.
45
When a running car stops suddenly, the passengers tends to lean forward because of:
Discuss
Answer & Solution
Answer: Option C
Solution:
When a running car stops suddenly, the passenger tends to lean forward because of inertia of motion. according to Newton's 1st law of motion, every bodies have nature to maintain inertia of rest or motion until there is no net force applied on that body.
46
A man stands in a lift which accelerates upwards. The resultant reaction force on the floor of the lift is
Discuss
Answer & Solution
Answer: Option A
Solution:
The weight of the man mg is acting on the floor. As the lift is moving up with an acceleration, say a, the man too in it is having this acceleration. The force producing this acceleration is ma. By Newton's third law, this force will have an equal reaction pressing the floor equal to ma. Therefore the total resultant reaction on the floor is mg+ma = m(g+a) which is mg, the weight of the man. So (a) is correct.
47
Who defined the law of gravitation ?
Discuss
Answer & Solution
Answer: Option A
Solution:
Isaac Newton put forward the law in 1687 and used it to explain the observed motions of the planets and their moons, which had been reduced to mathematical form by Johannes Kepler early in the 17th century.
48
It is difficult to fix a nail on a freely suspended wooden frame. Which law supports this statement?
Discuss
Answer & Solution
Answer: Option C
Solution:
Newton's third law supports this statement.
When the wooden block is not resting against a support, the block and nails both move forward on being hit with a hammer. However, when the block is held firmly against a support, and the nail is hit, an equal reaction of the support drives the nail into the block.
49
In the Earth, the weight of a body is maximum at the
Discuss
Answer & Solution
Answer: Option D
Solution:
Since weight of the body is directly proportional to g, the weight of the body is maximum at the centre of the earth and zero at the centre of the earth.
50
A person is hurt on kicking a stone due to
Discuss
Answer & Solution
Answer: Option C
Solution:
Newton’s third law states that “For every action, there is an equal and opposite reaction.” The statement means that in every interaction, there is a pair of forces acting on the two interacting objects. The size of the forces on the first object equals the size of the force on the second object. The direction of the force on the first object is opposite to the direction of the force on the second object. So harder the stone is kicked, the harder will be its effect on the hitter.