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Q:

A force of 20 N displaces an object through 2 m and does a work of 20 J. The angle between the force and displacement is

A) 60 deg B) 0 deg
C) 90 deg D) 30 deg
 
Answer & Explanation Answer: A) 60 deg

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Q:

In the gamma decay of a nucleus

A) the mass number of the nucleus changes whereas its atomic number does not change B) the mass number of the nucleus does not change whereas its atomic number changes
C) both the mass number and the atomic number of the nucleus change D) neither the mass number nor the atomic number of the nucleus changes
 
Answer & Explanation Answer: D) neither the mass number nor the atomic number of the nucleus changes

Explanation:

The emission of gamma rays does not alter the number of protons or neutrons in the nucleus but instead has the effect of moving the nucleus from a higher to a lower energy state (unstable to stable)

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Q:

What is the SI unit of pressure?

A) Newton B) Weber
C) Pascal D) Henry
 
Answer & Explanation Answer: C) Pascal

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Q:

Rectifiers convert _____.

A) high voltage to low voltage B) low voltage to high voltage
C) AC to DC D) DC to AC
 
Answer & Explanation Answer: C) AC to DC

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Q:

Acceleration due to gravity on a planet decreases with ______.

A) decrease in radius of the planet B) increase in mass of the planet
C) decrease in mass of the body D) increase in altitude from surface of the planet
 
Answer & Explanation Answer: D) increase in altitude from surface of the planet

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Q:

A ball of 0.1 kg is dropped from rest. When it falls through a distance of 2 m, the work done by the force of gravity is

A) 0.98 J B) -0.98 J
C) 1.96 J D) -1.96 J
 
Answer & Explanation Answer: C) 1.96 J

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Q:

Cryogenics is a branch of Physics that deal with ______.

A) very high temperatures B) very low temperatures
C) growth of extremely small crystals D) growth of extremely large crystals
 
Answer & Explanation Answer: B) very low temperatures

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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 same as that of earth and radius is half as that of earth is _________________.

 

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

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