set 11 MCQ Questions & Answers Detailed Explanation
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The following question based on light, heat, thermodynamics, wave motion, sound, optics & oscillations topic of general science mcq
(a) A and B are correct and B is the correct explanation of A.
(b) Both A and B are wrong.
(c) A and B are correct and B is not the correct explanation of A.
(d) A is correct but B is wrong.
The correct answers to the above question in:
Answer: (a)
Practice light, heat, thermodynamics, wave motion, sound, optics & oscillations (set 11) Online Quiz
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Read more light heat thermodynamics wave sound optics oscillation Based General Science Questions and Answers
Question : 1
What is the function of the thermostat of a refrigerator?
a) To increase the freezing point
b) To maintain constant temperature
c) To lower the temperature
d) To decrease the melting point
Answer »Answer: (b)
Question : 2
A biotechnique in which ultrasonic sound is used
a) E.C.G.
b) E.E.G.
c) Sonography
d) X-ray
Answer »Answer: (c)
Question : 3
‘The stars seem to be higher on the sky than they actually are’. This can be explained by
a) total internal reflection
b) atmospheric refraction
c) dispersion of light
d) diffraction of light
Answer »Answer: (b)
Due to atmospheric refraction the twinkling of star, and their position appear higher than the normal.
Question : 4
A sound wave having certain frequency is incident on air-water surface. A part of it is reflected and other part is refracted into water. Then:
a) the frequency of reflected wave will be more than frequency of refracted wave
b) the reflected wave will travel faster than refracted wave
c) the wavelength of refracted wave will be more than wavelength of reflected wave
d) the frequency, wavelength and velocity of reflected and refracted waves will be same as that of incident wave
Answer »Answer: (c)
We know that
speed = frequency × wavelength
If the frequency is constant, then speed a wavelength
We know that the speed of the sound waves in water is more than that of air.
Hence option (c) is correct.
Question : 5
Xeric condition refers to
a) low humidity
b) high evaporation
c) low temperature
d) extreme temperature
Answer »Answer: (a)
Question : 6
Assertion (A):
With the increase of temperature, the viscosity of glycerin increases.
Reason (R):
Rise of temperature increases kinetic energy of molecules.
Code
a) Both (A) and (R) are true, but (R) is not the correct explanation of (A)
b) (A) is true, but (R) is false
c) Both (A) and (R) are true and (R) is the correct explanation of (A)
d) (A) is false, but (R) is true
Answer »Answer: (d)
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