Physics - Questions and Answers, General Study (GK)

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181.

Transverse waves can propagate

(a)in a gas but not in a metal

(b)both in a gas and in a metal

(c)not in a gas but in a metal

(d)neither in a gas nor in a metal

Comment

Answer is: CNA

182.

Which one of the following is the correct sequence of wavelengths of radiations?

(a)UV > Green > IR > Hard X-rays

(b)IR > Green > UV > Hard x-rays

(c)UV > Hard X-rays > IR > Green

(d)IR > Hard X-rays > Green > UV

Comment

Answer is: BNA

183.

SONAR is based on the principle of

(a)resonance

(b)reverberation

(c)echo

(d)none of these

Comment

Answer is: CNA

184.

Polarization in electromagnetic wave is caused by

(a)refraction

(b)reflection

(c)transverse nature of electromagnetic waves

(d)longitudinal nature of electromagnetic waves

Comment

Answer is: CNA

185.

What frequency range of EM waves is used for commercial FM radio?

(a)88 MHz to 108 MHz

(b)88 GHz to 108 GHz

(d)none of the above

Comment

Answer is: ANA

186.

Why is sound heard with more intensity through CO₂ than through the air?

(a)Density of CO₂ is more than that of air

(b)Density of CO₂ is less than that of air

(c)Air is a bad conductor of heat

(d)CO₂ is a compound but air is a mixture of gases

Comment

Answer is: ANA

187.

The wavelength of X-rays is of the order of

(a)1 mm

(b)1 cm

(d)1 angstrom

Comment

Answer is: DNA

188.

Some common mediums in which speed of sound waves is measured are mentioned below.
1. Air
2. Steel
3. Copper
4. Water
What is the correct increasing order of the speed of sound?

(a)1 < 4 < 2 < 3

(b)4 < 1 < 2 < 3

(d)4 < 1 < 3 < 2

Comment

Answer is: CNA

189.

How does time period (T) of a second pendulum vary with length (L)?

(a)T ∝ L ³

(b)T ∝ L ²

(c)T ∝ L

(d)T does not depend on L

Comment

Answer is: DNA

190.

Speed of electromagnetic wave is the same

(a)for all frequencies

(b)for all wavelengths

(c)in all media

(d)for all intensities

Comment

Answer is: DNA

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Physics - Questions and AnswersPage 19

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