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The following question based on light, heat, thermodynamics, wave motion, sound, optics & oscillations topic of general science mcq
(a) Frequency of ultrasonic waves is of the same order as that of X-rays
(b) Ultrasonic waves can travel in vacuum
(c) Wavelength of ultrasonic waves is of the same order as that of microwaves
(d) Speed of ultrasonic waves is of the same order as that of light
The correct answers to the above question in:
Answer: (a)
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Read more light heat thermodynamics wave sound optics oscillation Based General Science Questions and Answers
Question : 1
What is the effect of humidity on sound waves when humidity increases?
a) Speed of sound waves remains same
b) Speed of sound waves is more
c) Speed of sound waves is less
d) Speed of sound waves becomes zero
Answer »Answer: (b)
The velocity of sound = $√{γRT}/M$
When water vapour is present in air average molecular weight of air decreases and hence velocity increases.
Question : 2
How much should minimum distance be between the source of sound and reflecting surface, so that an echo can be heard clearly?
a) 17 metre
b) 24 metre
c) 10 metre
d) 30 metre
Answer »Answer: (a)
Question : 3
A shrill sound has a ______ pitch and a dull sound has a _____ pitch.
a) low, low
b) high, low
c) low, high
d) high, high
Answer »Answer: (b)
Question : 4
Optical fibre works on the principle of
a) Scattering
b) Refraction
c) Total internal reflection
d) Interference
Answer »Answer: (c)
Question : 5
Some common mediums in which the speed of sound waves is measured are mentioned below?
- Air
- Steel
- Copper
- Water
a) 1 < 4 < 3 < 2
b) 1 < 4 < 2 < 3
c) 4 < 1 < 2 < 3
d) 4 < 1 < 3 < 2
Answer »Answer: (a)
The speed of sound is maximum in solids
Vsolid > Vliquid > Vgas.
Steel is more elastic than copper, hence the speed of sound is greater in steel than in copper.
Question : 6
Consider the figures of a metal ball and a metal ring given below. The metal ball can just pass through the hole of a metal ring formed out of a strip. When the ball is heated it gets stuck. But when the metal is heated
a) The ball gets stuck because of the diameter of the hole decrease on expansion
b) The ball will still pass through because the hole diameter does not change
c) The ball can still pass through the ring as diameter expands on heating
d) The ball will pass through because there is no change in the ring
Answer »Answer: (c)
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