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Q:

A sound wave has a frequency of 4 kHz and a wavelength of 40 cm. The time taken by the sound wave to travel a distance of 3.2 km is

A) 0.5 s B) 2.0 s
C) 4.0 s D) 1.0 s
 
Answer & Explanation Answer: B) 2.0 s

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Q:

Through which does light travel best?

A) water B) air
C) vacuum D) none
 
Answer & Explanation Answer: C) vacuum

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Q:

Fuse wire is made of an alloy of

A) Tin and Lead B) Tin and Copper
C) Lead and Copper D) Copper and Silver
 
Answer & Explanation Answer: A) Tin and Lead

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Q:

What is the unit of the physical quantity, Electrical conductance?

A) lux B) ohm
C) farad D) siemens
 
Answer & Explanation Answer: D) siemens

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Q:

The ratio of change in velocity of a body to the total time taken by it is its __________________.

A) acceleration B) displacement
C) force D) momentum
 
Answer & Explanation Answer: A) acceleration

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Q:

Rate of work done is _______.

A) Energy B) Power
C) Momentum D) Impulse
 
Answer & Explanation Answer: B) Power

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Q:

Sextant is an instrument used in which of the following ?

A) Gynaecology B) Navigation
C) Birth control D) Medical treatment
 
Answer & Explanation Answer: B) Navigation

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Q:

In total internal reflection, the light travel from

A) rarer to denser medium and it occurs with no loss of intensity B) denser to rarer medium and it occurs with no loss of intensity
C) rarer to denser medium and it occurs with loss of intensity D) denser to rarer medium and it occurs with loss of intensity
 
Answer & Explanation Answer: B) denser to rarer medium and it occurs with no loss of intensity

Explanation:

According to wave theories, for Total internal reflection tohappen: Light must travel from denser medium to rarer medium. Angle of incidence should be greater than critical angle. As in case of TIR, the image is perfectly clear, it implies that there has been no loss of intensity.

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