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 Physics Questions

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Q:

HEPA filters are used to remove microbes from

A) human tissues B) air
C) medical instruments D) liquids
 
Answer & Explanation Answer: B) air

Explanation:

High-efficiency particulate air (HEPA), also known as high-efficiency particulate absorbing and high-efficiency particulate arrestance, is an efficiency standard of air filter.

hepa-filters1596516018.png image

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Q:

The ratio of change in velocity of a body to the total time taken by it is its __________________.

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

Explanation:
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Q:

Sound travels at a speed of 333 m/s in the air, thus, in 1 s, a distance of 333 m is travelled by

A) source B) disturbace
C) particles D) receiver
 
Answer & Explanation Answer: B) disturbace

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Q:

If the acceleration due to gravity on the surface of earth is g, then the acceleration due to gravity on the surface of a planet whose mass is half of that of earth and radius is same as that of earth is _________________.

 

A) g/2 B) 4g
C) 2g   D) g/4
 
Answer & Explanation Answer: A) g/2

Explanation:
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Q:

One step in the production of hydroelectric power involves _____.

A) falling water that turns a turbine  B) electric current flowing across a dam
C) hot water from under the ground D) tides that pour through a barrier dam
 
Answer & Explanation Answer: A) falling water that turns a turbine 

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Q:

What is the unit of electric resistance?

A) Dyne B) Pascal
C) Joule D) Ohms
 
Answer & Explanation Answer: D) Ohms

Explanation:
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Q:

A galvanometer can be converted into a voltmeter by connecting with it a

A) high resistance in parallel B) low resistance on parallel
C) high resistance on series D) low resistance in series
 
Answer & Explanation Answer: C) high resistance on series

Explanation:
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Q:

A body in equilibrium _______.

A) can move with constant acceleration B) is always at rest
C) can move with constant velocity D) can move with variable acceleration
 
Answer & Explanation Answer: C) can move with constant velocity

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