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 Physics Questions

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Q:

Rate of change of displacement is known as ............

A) Acceleration B) Velocity
C) Speed D) Distance
 
Answer & Explanation Answer: B) Velocity

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Q:

If price of an article decreases from Rs 240 to Rs 220, when quantity demanded increases from 200 units to 210 units. Find point elasticity of demand?

A) 0.6 B) -1.8
C) -0.6 D) 1.8
 
Answer & Explanation Answer: C) -0.6

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Q:

The strength of a force is usually expressed by its __________.

A) Motion B) Direction
C) Interaction D) Magnitude
 
Answer & Explanation Answer: D) Magnitude

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Q:

Calculate the time period (in seconds) of a sound wave of wavelength 2m travelling with a speed of 250 m/s.

A) 500 B) 0.008
C) 0.016 D) 250
 
Answer & Explanation Answer: B) 0.008

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Q:

Which one of the following physical quantities has the same dimensions as that of Planck’s constant h?

A) Linear momentum B) Angular momentum
C) Force D) Potential energy
 
Answer & Explanation Answer: B) Angular momentum

Explanation:

In S.I. System unit of angular momentum is "joule.Second".

SI unit of Planck's constant is joule-seconds(j-s).

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Q:

Find the resistance (in mega Ω) of a wire of length 20m, cross sectional area 1 cm2 and made of a material of resistivity 200 Ωm.

A) 40 B) 4000
C) 80 D) 2000
 
Answer & Explanation Answer: A) 40

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Q:

In the formula average velocity = (u + v) /2, u is the ___________.

A) Final velocity B) Initial displacement
C) Initial velocity D) Final displacement
 
Answer & Explanation Answer: C) Initial velocity

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Q:

Choose the most appropriate answer:Sir CV Raman was awarded Noble Prize for his work connected with which of the following phenomenon of radiation?

A) Scattering B) Diffraction
C) Interference D) Polarization
 
Answer & Explanation Answer: A) Scattering

Explanation:

The Nobel Prize in Physics 1930 was awarded to Sir Chandrasekhara Venkata Raman "for his work on the scattering of light and for the discovery of the effect named after him".

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