set 12 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) Air has no effect as it is closed from all sides
(b) Temperature of boiling water increases due to high pressure
(c) The temperature of boiling water decreases due to high pressure
(d) Evaporation of the water used is very small
The correct answers to the above question in:
Answer: (b)
Practice light, heat, thermodynamics, wave motion, sound, optics & oscillations (set 12) 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 absolute zero temperature?
a) Theoretically the lowest possible temperature
b) The temperature at which the vapour of any liquid substance is condensed
c) The starting point of any temperature scale
d) The temperature at which all material are in vapour form
Answer »Answer: (a)
Question : 2
If Va, Vw and Vs respectively are the speed of sound in air, water and steel, then
a) Vs < Vw < Va
b) Vw < Vs < Va
c) Va < Vw < Vs
d) Vs < Va < Vw
Answer »Answer: (c)
Question : 3
Which of the following is used to take 3-dimensional pictures?
a) Radiography
b) Holography
c) Photography
d) None of these
Answer »Answer: (b)
Question : 4
A coin in a beaker filled with water appears raised. This phenomenon occurs because of the property of
a) total internal reflection of light
b) reflection of light
c) refraction of light
d) interference of light
Answer »Answer: (c)
We know that, the apparent depth is m times less than the actual depth. i.e.,$d_{apparent} = {d_{actual}}/μ$
Question : 5
When light passes from one medium to another medium, which one of the following does not change?
a) Wavelength
b) Velocity
c) Intensity
d) Frequency
Answer »Answer: (d)
Question : 6
Consider the following statements.
- Some bodies may contract from heating
- Water shows anomalous expansion.
a) Both (A) and (B) are true.
b) (A) is true and (B) is false
c) (A) is false and (B) is true.
d) Both (A) and (B) are false.
Answer »Answer: (a)
Some bodies like wood, rubber etc. have a negative value of the coefficient of thermal expansion, hence they contract on heating.
Hence (A) is true. (B) is also true.
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