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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-1 section-9

Each section contains 100 MCQs on Physics .
1
What is the change in the angular momentum of a system as per the Law of Conservation of Angular momentum, if the total external torque acting is zero?
Discuss
Answer & Solution
Answer: Option A
Solution:
If net external torque on a system is zero, then the angular momentum of the system can not change. If net external torque on a system is zero, then the angular momentum of the system remains same.
2
The force that keeps a body in a circular motion called
Discuss
Answer & Solution
Answer: Option A
Solution:
A centripetal force is a net force that acts on an object to keep it moving along a circular path.
3
It is easier to carry two buckets of water in one hand each, than to carry only one in one hand because
Discuss
Answer & Solution
Answer: Option C
Solution:
It is easier to carry two buckets of water in one hand each, than to carry only one in one hand because the centre of gravity and centre of equillibrium fall within the feet. The weight is spaced out more evenly on both the sides of the body than it would be if you had to carry in a single bucket.
4
The working of a rocket is based on the principle of:
Discuss
Answer & Solution
Answer: Option A
Solution:
Rocket works on the principle of conservation of linear momentum.
5
A bomb at rest explodes into a large number of tiny fragments. The total momentum of all the fragments
Discuss
Answer & Solution
Answer: Option A
Solution:
In an explosion, an internal impulse acts in order to propel the parts of a system (often a single object) into a variety of directions. After the explosion, the individual parts of the system (that is often a collection of fragments from the original object) have momentum. If the vector sum of all individual parts of the system could be added together to determine the total momentum after the explosion, then it should be the same as the total momentum before the explosion. Just like in collisions, total system momentum is conserved.
6
A man standing at the top of a tower has two spheres A and B. He drops sphere A downwards and throws sphere B horizontally at the same time. Which of the following is correct ?
Discuss
Answer & Solution
Answer: Option A
Solution:
If no air resistance is present, the rate of descent depends only on how far the object has fallen, no matter how heavy the object is. This means that two objects will reach the ground at the same time if they are dropped simultaneously from the same height. This statement follows from the law of conservation of energy.
7
Two stones of unequal masses are thrown vertically up with the same velocity. Which of the following will happen?
Discuss
Answer & Solution
Answer: Option C
Solution:
Galileo’s experiment showed that if two bodies of unequal masses are dropped from the same height, the time required by them to reach the ground are equal. If they are thrown vertically upwards with the same initial velocity, then the ratio of the time required to reach the ground is equal to unity. This means that both of them will reach the same height.
8
The dimension of which of the following is the same as that of impulse ?
Discuss
Answer & Solution
Answer: Option B
Solution:
Impulse has the same units and dimensions (MLT-1) as momentum.
9
An object covers distance which is directly proportional to the square of the time. Its accelaration is
Discuss
Answer & Solution
Answer: Option D
Solution:
If an object covers distance in direct proportion to the square of the time elapsed, then the acceleration is constant.
10
A bullet of mass 10gm is fired with a velocity of 40 m/s from a gun of mass 8 kg. Find the recoil velocity (in m/s) of the gun.
Discuss
Answer & Solution
Answer: Option D
No explanation is given for this question. Let's Discuss on Board