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 Physics Questions

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Q:

The speed of the light is maximum in

A) Air B) Vacuum
C) Water D) Glass
 
Answer & Explanation Answer: B) Vacuum

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Q:

The Brownian Motion was discovered by

A) Robert Brown B) Mandel Brown
C) Isaac Newton D) John Brown
 
Answer & Explanation Answer: A) Robert Brown

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Q:

Which among the following is not an environment friendly mode of producing electricity?

A) Thermal Power B) Solar Power
C) Wind Energy D) Bio-waste
 
Answer & Explanation Answer: A) Thermal Power

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Q:

Consider a planet whose mass and radius are both twice the mass and radius of Earth. The acceleration due to gravity on the surface of the planet is 'n' times that on Earth. The value of n is:

 

A) 4 B) 1
C) 12 D) 2
 
Answer & Explanation Answer: C) 12

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Q:

A lens has a power +2.0 D. The type of lens and its focal length will be

A) Concave, -0.5 m B) Convex, 0.5 m
C) Concave, 0.5 m D) Convex, -0.5 m
 
Answer & Explanation Answer: B) Convex, 0.5 m

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Q:

What is the range of frequencies of sound waves audible to human beings?

A) 16kHz to 200kHz B) 16Hz to 16kHz
C) 16Hz to 20kHz D) 14Hz to 20kHz
 
Answer & Explanation Answer: C) 16Hz to 20kHz

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Q:

What does the kinetic energy (KE) of a moving body depend upon?

A) Mass & its position B) Weight & its position
C) Mass & acceleration D) Mass & velocity
 
Answer & Explanation Answer: D) Mass & velocity

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Q:

Why does a sprinter keep running even after crossing the finishing line?

A) He wants to make sure that he crosses the line B) Inertia of rest takes some time to make him stop
C) Inertia of motion keeps him moving D) Friction between his shoes and the ground causes him to move beyond the line
 
Answer & Explanation Answer: C) Inertia of motion keeps him moving

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