Physics General Knowledge Questions: Physics GK Question for Competitive Exams
Physics GK Questions
Q : The unit of which of the following is not newton-metre?
(A) Force
(B) Energy
(C) Work
(D) kinetic Energy
Correct Answer : A
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.
Where will it take more time to cook rice?
(A) on the beach
(B) in Shimla
(C) Mount Everest
(D) at the depth of the sea
Correct Answer : C
Explanation :
At higher altitude, water starts boiling at lower temperature and heat required for cooking food is not available, because heat escapes in form of water vapour. So, rice takes longer time to cook at Mount Everest.
What happens to the temperature of a liquid when it evaporates?
(A) increase
(B) remain unchanged
(C) grow faster
(D) decrease
Correct Answer : D
Explanation :
During the process of evaporation of liquid the temperature of the liquid decreases because the surface molecules while evaporating take some amount of energy from the other molecules of liquid. Thus, evaporation leads to cooling. Kinetic energy is proportional to absolute temperature.
The reason for the diffusion of light in the atmosphere is?
(A) Carbon dioxide
(B) Water Vapor
(C) Helium
(D) Dust Particles
Correct Answer : D
Explanation :
The correct answer is dust particles. Diffusion of light in the atmosphere takes place due to dust particles. Diffusion is the net fluctuation of anything (for example, atoms, ions, molecules, energy) from a region of higher concentration to a region of lower concentration.
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."
The reason why a needle floats on top of the water is?
(A) Surface tension
(B) Adhesion
(C) Cohesion
(D) Capillarity
Correct Answer : A
Explanation :
It is due to the surface tension of the liquid.
What is the reason for the spherical shape of a liquid drop?
(A) Viscosity
(B) Light Load
(C) Surface Tension
(D) Atmospheric Pressure
Correct Answer : C
Explanation :
Due to surface tension, surface tries to minimize its area. As sphere has the minimum surface area among all geometrical shapes thus, liquid drop becomes spherical.
The working principle of the washing machine is?
(A) Sub-Centre
(B) Diffusion
(C) Centrifugation
(D) Dialysis
Correct Answer : C
Explanation :
The working principle of a washing machine is centrifugation. Centrifugation is a separation process that uses the action of centrifugal force to promote accelerated settling of particles in a solid-liquid mixture.
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.
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Rajesh Bhatia
A Writer, Teacher and GK Expert. I am an M.A. & M.Ed. in English Literature and Political Science. I am highly keen and passionate about reading Indian History. Also, I like to mentor students about how to prepare for a competitive examination. Share your concerns with me by comment box. Also, you can ask anything at linkedin.com/in/rajesh-bhatia-7395a015b/.
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