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Q:

What is the value of acceleration due to gravity on the surface of the earth?

A) 9.6 cm/s2 B) 9.8 m/s2
C) 10.8 m/s2 D) 9.8 cm/s2
 
Answer & Explanation Answer: B) 9.8 m/s2

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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:

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:

What is the type of Energy possessed by a stretched rubber band?

A) Potential energy B) Kinetic energy
C) Chemical energy D) Thermal energy
 
Answer & Explanation Answer: D) Thermal energy

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Q:

If two coulomb of charge flows through any cross-section of a conductor in one second, what will be the current flowing through it?

A) 1 Ampere B) 1/2 Ampere
C) 1/4 Ampere D) 2 Amperes
 
Answer & Explanation Answer: D) 2 Amperes

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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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Q:

Friction is caused by the ______________ on the two surfaces in contact.

A) irregularities B) smoothness
C) densities D) gaps
 
Answer & Explanation Answer: A) irregularities

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Q:

The phenomenon of change in direction of light when it passes from one medium to another is called

A) Propagation B) Reflection
C) Refraction D) Dispersion
 
Answer & Explanation Answer: C) Refraction

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