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 Physics Questions

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Q:

Electric charges that are different attract each other.

A) TRUE B) FALSE
Answer & Explanation Answer: A) TRUE

Explanation:

Same charges will repel each other and the charges that are different will attract each other.


Electric_charges_that_are_different_attract_each_other._1545283189.png image

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Q:

Which physical quantity is measured in 'siemens'?

A) Electric potential B) Electrical conductance
C) Magnetic flux D) Refractive index
 
Answer & Explanation Answer: B) Electrical conductance

Explanation:
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Q:

Radiocarbon is produced in the atmosphere as a result of

A) collision between fast neutrons and nitrogen nuclei present in the atmosphere B) action of ultraviolet light from the sun on atmospheric oxygen
C) action of solar radiations particularly cosmic rays on carbon dioxide present in the atmosphere D) lightning discharge in atmosphere
 
Answer & Explanation Answer: A) collision between fast neutrons and nitrogen nuclei present in the atmosphere

Explanation:
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Q:

When a constant force acts on an object with a mass of 8 kg for a duration of 3 s. it increases the object's velocity from 4 m/s to 6 m/s . What is the magnitude of the applied force?

A) 5.33 N B) 4.33 N
C) 6.33 N D) 3.33 N
 
Answer & Explanation Answer: A) 5.33 N

Explanation:
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Q:

Which of the following has the shortest wavelength?

A) Gamma rays B) Radio waves
C) Microwaves D) Infrared rays
 
Answer & Explanation Answer: A) Gamma rays

Explanation:

Gamma rays has the shortest wavelength and radio waves has the longest wavelength.

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Q:

A mass of 20 kg is at a height of 8 m above the ground. Then the potential energy possessed by the bodyis: [Given g = 9.8 m/s]

A) 1568 J B) 1568 C
C) 1568 W D) 1568 N
 
Answer & Explanation Answer: A) 1568 J

Explanation:
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Q:

Glass is made from the mixture of

A) Sand and silicates B) Salt and Sand
C) Salt and silicates D) None of the above
 
Answer & Explanation Answer: A) Sand and silicates

Explanation:
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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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