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# Physics General Knowledge Questions: Physics GK Question for Competitive Exams

Rajesh Bhatia5 months ago 601.0K Views

In this post, I am sharing important physics questions. Practice physics gk with these important and selective physics questions and answers. You should try to memorize this collection of physics general knowledge questions for better results in competitive exams.

If you want to read Gk 2018 at a single page: Visit Gk Questions Blog.

These Physics-related questions are useful and there is a strong chance to ask these physics questions again for the competitive exams of 2018 like IAS, Bank PO, SSC CGL, RAS, CDS, UPSC exams, and all state-related exams.

You should also check General Science Questions and Chemistry GK Questions for better practice of Physics General knowledge for Competitive Exams. Try to solve these basic physics questions for better results in SSC.

Physics GK Quiz

Q :

Bernoulli's theorem is based on?

(A) on energy conservation

(B) on conservation of momentum

(C) on conservation of charge

(D) none of these

Correct Answer : A
Explanation :
Bernoulli's principle is based on the law of conservation of energy. We equate total energy (pressure energy, potential energy and kinetic energy) of a flowing liquid at different points flowing under constant pressure difference.

Q :

If the electrical resistance is to be reduced, then the number of resistors should be connected with

(A) Mala (Series)

(B) Parallel

(C) Mixed system

(D) None of These

Correct Answer : C
Explanation :

When resistors are connected in parallel, more current flows from the source than would flow for any of them individually, so the total resistance is lower.

Q :

Which of the following is not a unit of heat?

(A) Calorie

(B) Phon

(C) Joule

(D) Kcal

Correct Answer : B
Explanation :

The correct answer is Phon. Phon is not a unit of Heat.

Q :

The unit of which of the following is not newton-metre?

(A) Force

(B) Energy

(C) Work

(D) kinetic Energy

Correct Answer : A

Q :

An iron needle sinks in water but a ship floats, on what principle is this based?

(A) Pascal's principle

(B) Principle of Archimedes

(C) Law of Gravitation

(D) None of these

Correct Answer : B
Explanation :

Hence, according to Archimedes' principle, the upthrust is more than the weight of the ship. That is why the iron ship floats in water.

Q :

When a boat enters the sea from a river, then?

(A) rises slightly upwards

(B) sinks slightly

(C) remains unchanged

(D) none of these

Correct Answer : A
Explanation :

The correct answer is It rises a little. A ship rises a little when enters the sea from a river. Because of salinity, seawater has more density than river water. In the sea, the more buoyant force is exerted upon the ship than in the river.

Q :

When the speed of a moving object is doubled, then its kinetic energy?

(A) doubles

(B) increases three times

(C) remains the same

Correct Answer : D
Explanation :

The change in the kinetic energy of the object as the speed changes is proportional to the square of the factor by which the speed changes. If the speed of the object becomes double, its kinetic energy changes to four times the initial kinetic energy.

Q :

If a cyclist goes round a turn, then he

(A) bends outward

(B) bends inwards

(C) leans forward

(D) does not bend at all

Correct Answer : B
Explanation :

A cyclist bends inwards at a turn to balance the centrifugal force with the centripetal force. If the cyclist does not bend on the curve of the road the force will propel him outward of the road and would make him crash.

Q :

The amount of buoyancy obtained by a solid partially or fully immersed in a liquid depends on?

(A) on the amount of liquid displaced by the solid

(B) on the weight of the solid

(C) on the mass of the solid

(D) none of these

Correct Answer : A
Explanation :

Archimedes' principle states that : "The upward buoyant force that is exerted on a body immersed in a fluid, whether fully or partially submerged, is equal to the volume of the fluid that the body displaces."

Q :

The reason why a needle floats on top of the water is?

(A) Surface tension

(C) Cohesion

(D) Capillarity

Correct Answer : A
Explanation :

It is due to the surface tension of the liquid.