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The following question based on light, heat, thermodynamics, wave motion, sound, optics & oscillations topic of general science mcq
(a) 17 metre
(b) 24 metre
(c) 10 metre
(d) 30 metre
The correct answers to the above question in:
Answer: (a)
Discuss Form
Read more light heat thermodynamics wave sound optics oscillation Based General Science Questions and Answers
Question : 1
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 : 2
The principle reason why it is better to have two eyes than one is that
a) It gives a man a type of vision known as mosaic vision
b) By having two eyes we can easily see in the dark as well in dim light
c) By having two eyes we can distinguish colour easily
d) It enhances distance and depth perception in us
Answer »Answer: (d)
Question : 3
Consider the following statements:
- Principle of superposition can be used for any physical quantity.
- Principle of superposition can be used only when amplitude of quantity is small.
- It is not possible to have interference between the waves produced by two independent sources of same frequency.
- For interference of two waves the phase difference between the waves remain constant.
a) 1, 2 and 3
b) 1 and 2
c) 3 and 4
d) 2, 3 and 4
Answer »Answer: (a)
Principle of superposition is applicable in wave motion.
Question : 4
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 : 5
Which of the following statements is correct ?
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
Answer »Answer: (a)
Question : 6
Optical fibre works on the principle of
a) Scattering
b) Refraction
c) Total internal reflection
d) Interference
Answer »Answer: (c)
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