Physics GK Quiz Questions for Competitive Exams
In order to slide a huge box lying on the ground in her room, Reshma should apply a force which is greater than which of the following forces?
(A) Static friction
(B) Gravitational force
(C) Normal force
(D) Muscular force
Correct Answer : A
Explanation :
So, In order to slide a huge box lying on the ground in her room, Reshma should apply a force greater than the Static friction.
Light rays from an object fall on a surface and get reflected in a completely diffused manner. What can you say about the nature of the image of the object?
(A) It will be virtual and of same size.
(B) It will be real and enlarged.
(C) It will be virtual and enlarged.
(D) No image will be formed.
Correct Answer : C
Explanation :
Light rays from an object fall on a surface and get reflected in a completely diffused manner. What can you say about the nature of image of the object ? It will be virtual and of same size.
______ in a particular direction is velocity.
(A) Acceleration
(B) Displacement
(C) Speed
(D) Distance
Correct Answer : C
Explanation :
A straight object moving in a specific direction is said to have velocity. As a result, velocity refers to an object's speed in a specific direction.
In optics, the refractive index of a substance is described by the formula n = c/v, where c is:
(A) the speed of light in medium
(B) the centre of curvature
(C) the radius of the sphere
(D) the speed of light in vacuum
Correct Answer : D
Explanation :
Refractive Index Formulan is the refractive index. c is the velocity of light in a vacuum ( 3 × 108 m/s) v is the velocity of light in a substance.
The colour of the sky appears to be blue.
(A) due to diffraction
(B) due to scattering
(C) due to reflection
(D) due to refraction
Correct Answer : B
Explanation :
The sky appears blue to the human eye as the short waves of blue light are scattered more than the other colours in the spectrum, making the blue light more visible.
Which scientist suggested that the magnet must exert an equal and opposite force on the current-carrying conductor?
(A) Michael Faraday
(B) Andre Marie Ampere
(C) Joseph Henry
(D) William Gilbert
Correct Answer : B
Explanation :
1. French scientist Andre-Marie Ampère suggested that a magnet should also exert an equal and opposite force on a current-carrying conductor.
2. A current-carrying wire has its own magnetic field.
3. A current-carrying wire attracts a magnetic material like a normal bar magnet.
4. When the current is withdrawn or the switch is closed, there is no magnetic effect in that case.
5. This phenomenon was called the magnetic effect of current.
Identify the correct statement.
(A) The resistance of a wire depends on the length and density of the wire.
(B) Specific resistance is the same for all conductors.
(C) Resistance of a wire depends on the length and cross-section of the wire.
(D) Specific resistance is dependent on the cross-sectional area of the wire.
Correct Answer : C
Explanation :
1. Resistance of a wire depends on the length and cross-section of the wire.
Mechanical energy is the sum of potential energy and ______ energy.
(A) kinetic
(B) heat
(C) electrical
(D) chemical
Correct Answer : A
Explanation :
1. Mechanical energy is a combination of kinetic energy and potential energy.
2. Mechanical energy is defined as the sum of kinetic energy and potential energy used to do work on an object.
3. Mechanical energy is the form of energy that is related to the position and motion of an object.
What is the correct order of radiations in descending order of frequencies?
(A) Infrared > Microwaves > Radio waves > X-rays
(B) Radio waves > X-rays > Microwaves > Infrared
(C) X-rays > Infrared > Microwaves > Radio waves
(D) Infrared > Microwaves > X-rays > Radio waves
Correct Answer : C
Explanation :
The correct order of radiations is in descending order of frequencies.
X-rays > Infrared > Microwaves > Radio waves
In 1962, who published 'The History of Ocean Basins', which outlined the theory of how tectonic plates could move, later called 'sea floor spreading'?
(A) George Edward Backus
(B) Alfred Wegener
(C) Louis Bauer
(D) Harry Hammond Hess
Correct Answer : D
Explanation :
1. In 1962, Harry Hammond Hayes published 'The History of Ocean Basins'.
2. In this, the theory of plate tectonics was outlined and which was later also known as 'ocean bottom spreading'.
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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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