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 Physics Questions

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Q:

"When a card placed over a tumbler is flicked with the finger, the coin placed over it falls in the tumbler".

A) Law of conservation of energy B) Newton's third law of motion
C) Law of Inertia D) Law of conservation of momentum
 
Answer & Explanation Answer: C) Law of Inertia

Explanation:
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Q:

Land is considered a resource because it

A) is used to produce things B) requires labor to be useful
C) is always available to use D) costs little or nothing to use
 
Answer & Explanation Answer: A) is used to produce things

Explanation:

Land is considered as an important resource because it is useful in producing many things. For example, in agriculture, land is used for cultivating the crop, in industrial use, it is used for constructing factories and to make products that we use.

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Q:

Work done in a free expansion process is

A) Minimun B) 0
C) Maximum D) None of the above
 
Answer & Explanation Answer: B) 0

Explanation:

No work done as there is no external external pressure in free expansion. 

 

Hence, Work done in a free expansion process is Zero.

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Q:

Which of the following causes adiabatic temperature changes in atmosphere?

A) Deflection and advection B) Latent heat of condensation
C) Expansion and compression of the air D) Partial absorption of solar radiation by the atmosphere
 
Answer & Explanation Answer: C) Expansion and compression of the air

Explanation:

Application of temperature changes in the atmosphere is in adiabatics, or temperature change which are caused by compressing or allowing air to expand.

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Q:

Refractive Index of glass with respect to water is

A) 4/3 B) 9/8
C) 2/3 D) 8/9
 
Answer & Explanation Answer: D) 8/9

Explanation:

Refractive Index of glass with respect to water can be calculated by 

(Refractive Index of glass with respect to air) × (1/Refractive Index of water with respect to air)

 

We know that,

Refractive Index of glass with respect to air = 4/3

Refractive index of water with respect to air = 3/2

 

Hence, Refractive Index of glass with respect to water = (4/3) x (2/3) = 8/9.

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Q:

Which measurement depends on gravitational force?

A) Mass B) Weight
C) Height D) All of the above
 
Answer & Explanation Answer: B) Weight

Explanation:

We know that,

Weight W = mg. That is mass times gravitational force.

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Q:

Wind and solar energy are examples of

A) Finite energies B) Renewable energies
C) Non renewable energies D) None of the above
 
Answer & Explanation Answer: B) Renewable energies

Explanation:

Wind and solar energy are examples of Renewable energies. 

 

Renewable energy sources are those which can be naturally replenished. 

wind_and_solar_energy_are_examples_of1535692456.jpg image

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Q:

To resolve an object in an electron microscope,

A) the wavelength of the electrons must be close to the diameter of the object B) the wavelength of the electrons must be greater than the diameter of the object.
C) Both A & B D) None of the above
 
Answer & Explanation Answer: A) the wavelength of the electrons must be close to the diameter of the object

Explanation:
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