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The following question based on light, heat, thermodynamics, wave motion, sound, optics & oscillations topic of general science mcq
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
The correct answers to the above question in:
Answer: (d)
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
Xeric condition refers to
a) low humidity
b) high evaporation
c) low temperature
d) extreme temperature
Answer »Answer: (a)
Question : 2
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 : 3
A : At high altitude regions the cooking of food becomes difficult. B : Water boils at lower temperature when the pressure is low.
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.
Answer »Answer: (a)
Question : 4
The minimum distance of clear vision for a normal healthy eye of human being is supposed to be
a) 15 cm
b) 10 cm
c) 50 cm
d) 25 cm
Answer »Answer: (d)
Question : 5
Assertion (A):
A piece of copper and a piece of glass are heated to the same temperature. When touched, thereafter the copper piece appears hotter than the glass piece.
Reason (R):
The desity of copper is more than that of glass.
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: (a)
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