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 Physics Questions

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Q:

Change in focal length of eye lens is caused by

A) ciliary muscles B) iris
C) pupil D) retina
 
Answer & Explanation Answer: A) ciliary muscles

Explanation:
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Q:

The impression of an image persists on the retina for about _________ of a second.

A) 1/10th B) 1/8th
C) 1/16th D) 1/5th
 
Answer & Explanation Answer: C) 1/16th

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Q:

Hot springs are heated geothermally by underlying

A) water B) magma
C) mitula D) None of the above
 
Answer & Explanation Answer: B) magma

Explanation:

Magma is molten rocks beneath the earth's crust. Hot springs are heated geothermally by underlying magma.

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Q:

The reverse effect of X-ray emission is

A) Raman effect B) Compton effect
C) Zeeman effect D) Photo-electric effect
 
Answer & Explanation Answer: D) Photo-electric effect

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Q:

If the current flowing through a circuit is 0.6 A for 6 mins, the amount of electric charge flowing through it is .......

A) 360C B) 216 C
C) 60 C D) 36 C
 
Answer & Explanation Answer: B) 216 C

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Q:

To resolve an object in an electron microscope,

A) the wavelength of the electrons must be close to the diameter of the object B) the wavelength of the electrons must be greater than the diameter of the object.
C) Both A & B D) None of the above
 
Answer & Explanation Answer: A) the wavelength of the electrons must be close to the diameter of the object

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Q:

What are the two kinds of Rotatory motion?

A) Spin and Vibrational motion B) Spin and Projectile motion
C) Spin and Orbital motion D) Spin and Translatory motion
 
Answer & Explanation Answer: C) Spin and Orbital motion

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Q:

The pressure of a fluid varies with depth h as P = PQ+pgh, where p is the fluid density. This expression is associated with

A) Pascal’s law B) Newton’s law
C) Bernoulli’s principle D) Archimedes’ principle
 
Answer & Explanation Answer: A) Pascal’s law

Explanation:

Pascal's law is a principle in fluid mechanics that states that a pressure change occurring anywhere in a confined incompressible fluid is transmitted throughout the fluid such that the same change occurs everywhere.

This principle is stated mathematically as: P= P + rgh

 

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