Physics Questions

Q:

SI unit of temperature is

A) Kelvin B) Celsius
C) Fahrenheit D) Joule
 
Answer & Explanation Answer: A) Kelvin

Explanation:
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Q:

Persistence of vision is the principle behind

A) Telescope B) Periscope
C) Cinema D) Microscope
 
Answer & Explanation Answer: C) Cinema

Explanation:

Optical illusion is what that refers to persistence of vision with a principle that multiple images blend into a single image in human mind and what is showed in cinema.

 

Hence, Persistence of vision is the principle behind cinema.

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Q:

Electric current is measured by which instrument?

A) voltmeter B) ammeter
C) barometer D) sinometer
 
Answer & Explanation Answer: B) ammeter

Explanation:

Electric current is measured by the instrument called ammeter. As current in a circuit is measured in amperes, the instrument used is called as ammeter.

Electric_current_is_measured_by_which_instrument1555505098.jpg image

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Q:

A man stands in a lift which accelerates upwards. The resultant reaction force on the floor of the lift is 

A) greater than the weight of the man B) less than the weight of the man
C) Same as the weight of the man D) Zero
 
Answer & Explanation Answer: A) greater than the weight of the man

Explanation:

The weight of the man mg is acting on the floor. As the lift is moving up with an acceleration, say a, the man too in it is having this acceleration. The force producing this acceleration is ma. By Newton's third law, this force will have an equal reaction pressing the floor equal to ma. Therefore the total resultant reaction on the floor is mg+ma = m(g+a) which is mg, the weight of the man. So (a) is correct.

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Q:

Which planet has the lowest density?

A) Earth B) Jupiter
C) Saturn D) Neptune
 
Answer & Explanation Answer: C) Saturn

Explanation:

Saturn, the solar system's second largest planet that takes the prize for least dense. It's less dense than water, which has led many people to postulate that it would float.

However, even if it somehow found its way to a body of water large and deep enough to contain it, Saturn would break apart and its rocky core would sink.

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Q:

Buoyancy depends on

A) the mass of the liquid displaced B) the mass of the body
C) the depth to which the body is immersed D) the shaped of the body
 
Answer & Explanation Answer: A) the mass of the liquid displaced

Explanation:

Buoyancy or Upthrust, is an upward force exerted by a fluid that opposes the weight of an immersed object.

In a column of fluid, pressure increases with depth as a result of the weight of the overlying fluid.

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Q:

The Length of the Day is determined in

A) length of the hours B) length of the year
C) astronomical units D) solar terms
 
Answer & Explanation Answer: C) astronomical units

Explanation:

The Length of the Day is determined in Astronomical Units.

The length of a day corresponds to the time the Earth takes to turn around on its axis, which is approximately 24 hours. But it's not exactly 24 hours. 

This phenomenon is due to tides raised by the Moon which slow Earth's rotation. Because of the way the second is defined, the mean length of a day is now about 86 400.002 seconds, and is increasing by about 1.7 milliseconds per century.

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Q:

The force exerted by a magnet is an example of _________.

A) Non-contact force B) Muscular force
C) Contact force D) Electrostatic force
 
Answer & Explanation Answer: A) Non-contact force

Explanation:
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