Physics Questions

Q:

Why metals conduct electricity?

A) Because of low melting point B) Because of high tensile strength
C) Because of free electrons D) Because of high atomic density
 
Answer & Explanation Answer: C) Because of free electrons

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Q:

A current I flows through a resistor. A source maintains a potential difference of V across the resistor. The energy supplied by the source in time t is 

A) V I t2 B) V I
C) V I t D) V I/t
 
Answer & Explanation Answer: C) V I t

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Q:

The area under a Velocity-Time graph represents ______________.

A) distance B) acceleration
C) force D) momentum
 
Answer & Explanation Answer: A) distance

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Q:

The value of universal gravitation constant (G) was determined by

A) Henry Cavendish B) Antoine L Lavoisier
C) Isaac Newton D) John Dalton
 
Answer & Explanation Answer: A) Henry Cavendish

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Q:

The color with the longest wavelength is

A) Red B) Violet
C) Indigo D) Orange
 
Answer & Explanation Answer: A) Red

Explanation:

Each color has a different wavelength.

 

Red has the longest wavelength and violet has the shortest wavelength.

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Q:

Which instrument is used for measuring humidity of atmosphere?

A) Barometer B) Anemometer
C) Thermometer D) Hygrometer
 
Answer & Explanation Answer: D) Hygrometer

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Q:

Cold air is ______.

A) lighter than warm air hence cold air settles down B) heavier than warm air hence cold air rises up
C) lighter than warm air hence cold air rises up   D) heavier than warm air hence cold air settles down  
 
Answer & Explanation Answer: D) heavier than warm air hence cold air settles down  

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Q:

Newton's first law is also known as _______.

A) Law of friction B) Law of moments
C) Law of Inertia D) Law of motion
 
Answer & Explanation Answer: C) Law of Inertia

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