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 Physics Questions

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Q:

For every action, there is an equal and opposite reaction, is Newton's

A) First law B) Second law
C) Third law D) Fourth law
 
Answer & Explanation Answer: C) Third law

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Q:

If objects appear enlarged and inverted in a rear view mirror, then which type of mirror is used?

A) Concave B) Convex
C) Cylindrical D) Plane
 
Answer & Explanation Answer: A) Concave

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Q:

Liquids and gases never show

A) diamagnetic property B) paramagnetic property
C) ferromagnetic property D) electromagnetic property
 
Answer & Explanation Answer: C) ferromagnetic property

Explanation:

On the basis of magnetic properties, substances are classified into three groups namely diamagnetic, paramagnetic and ferromagnetic.

As solids diffuse and reorder very slowly under ambient conditions, the net, directionally dependent (anisotropic) magnetic moment can persist. Conversely, liquids and gases freely tumble and reorder: water rearranges every few pico seconds (10^12 times per second).

Hence liquids and gases can never show ferromagnetic properties.

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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:

Which one of the following processes is responsible for the glittering of air bubble rising through water?

A) Reflection of light B) Refraction of light
C) Total internal reflection of light D) Scattering of light
 
Answer & Explanation Answer: C) Total internal reflection of light

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Q:

An object with a mass of 22 kg moving with a velocity of 5 m/s possesses a kinetic energy of :

A) 275 J B) 110 J
C) 2750 J D) 110 J
 
Answer & Explanation Answer: A) 275 J

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Q:

Instrument for measuring wind velocity is called

A) Coulombmeter B) Anemometer
C) Cyanometer D) Chronometer
 
Answer & Explanation Answer: B) Anemometer

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Q:

Which term is not associated with sound wave?

A) Hertz B) Decibel
C) Candela D) Mach
 
Answer & Explanation Answer: C) Candela

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