# Physics GK Questions SET-4

Here you will find GK MCQ Questions for physics GK questions with Answers PDF Free Download based on the important concepts and topics given in the textbook as per new exam pattern. This may assist you to understand and check your knowledge about the physics GK questions. Students also can take a free test of the Multiple Choice Questions of physics GK questions. Each question has four options followed by the right answer.

## Q1.In which of the following respects, the Light waves are different from sound waves?

1.Light waves are electromagnetic but sound waves are not
2.Light waves can travel through water but sound waves cannot
3.Light travels with the same speed in all media
4.Light waves produce interference but sound waves do not
Select the correct option from the codes given below:

[A] Only 1
[B] Only 1, 2 & 3
[C] Only 1 & 4
[D] None

Correct Answer: A [ Only 1]

## Q2.Which of the following is not a valid conservation law of classical Physics?

[A] Law of conservation of energy
[B] Law of conservation of current
[C] Law of conservation of angular momentum
[D] Law of conservation of charge

Correct Answer: B [Law of conservation of current]

## Q3.Which of these is the force required to move a body uniformly in a circle?

[A] Centrifugal force
[B] Centripetal force
[C] Kinetic force
[D] None of the above

## Q4.What is the value of escape velocity for earth?

[A] 9.8 km s-2
[B] 1.6 km s-2
[C] 11.2 km s-2
[D] 7.92 km s-2

Correct Answer: C [11.2 km s-2]

## Q5.What will be the total energy of a satellite moving around the earth in a circular orbit with speed v and having mass m.

[A] -1/2 m v 3
[B] 2 m v 2
[C] 1/2 m v 3
[D] -1/2 m v 2

Correct Answer: D [-1/2 m v 2]

## Q6.What happens to the orbital velocity of a satellite when the radius of orbit is increased?

[A] it decreases
[B] it increases
[C] it remains same
[D] None of the above

[A] Water
[B] Honey
[C] Blood
[D] Air

## Q8.Which of the following is another unit of frequency?

[A] decibel
[B] cycle per second
[C] metre per second
[D] second

Correct Answer: B [cycle per second]

## Q9.Which of the following are the cases of use of concave mirrors?

[A] Search-lights
[B] Shaving mirrors
[C] Solar furnaces
[D] All of the above

Correct Answer: D [All of the above]

## Q10.Which of the following nuclear processes is the source of energy output in the interior of stars?

[A] Nuclear Fission
[B] Nuclear Fusion
[C] Both a and b
[D] None

Q11.What is the time period for a satellite orbiting close to the surface of earth?

[A] 84.6 minutes
[B] 72.4 minutes
[C] 44.8 minutes
[D] 24 hours

## Q12.Which of the following about S.H.M is correct?

[A] In S.H.M. acceleration is maximum at extreme position
[B] In S.H.M. velocity is minimum at extreme position
[C] Both a and b
[D] None of the above

Correct Answer: C [Both a and b]

## Q13.Which of the following is correct about the speed of the sound, at same temperature?

[A] sound travels faster in humid air than in dry air
[B] sound travels slower in humid air than in dry air
[C] speed of sound is same in humid air and dry air
[D] None of the above

Correct Answer: A [sound travels faster in humid air than in dry air]

## Q14.What is the property of a conductor to resist the flow of charges known as?

[A] Conductance
[B] Conductivity
[C] Resistance
[D] Electric Potential

[A] Isobars
[B] Isotopes
[C] Isotones
[D] Isomers