set 3 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) X-rays
(b) Visible light
(c) Infrared
(d) Radio waves
The correct answers to the above question in:
Answer: (d)
Discuss Form
Read more light heat thermodynamics wave sound optics oscillation Based General Science Questions and Answers
Question : 1
A man is standing on a railway platform listening to the whistle of an engine that passes the man at a constant speed without stopping. If the engine passes the man at time t0. How does the frequency f of the whistle as heard by the man change with time :
a)
![physics sound mcq question answer 19 option c](https://careericons.com/adminicon/bunch/images/physics-sound-mcq-question-answer-19-option-c.png)
b)
![physics sound mcq question answer 19 option a](https://careericons.com/adminicon/bunch/images/physics-sound-mcq-question-answer-19-option-a.png)
c)
![physics sound mcq question answer 19 option b](https://careericons.com/adminicon/bunch/images/physics-sound-mcq-question-answer-19-option-b.png)
d)
![physics sound mcq question answer 19 option d](https://careericons.com/adminicon/bunch/images/physics-sound-mcq-question-answer-19-option-d.png)
Answer: (b)
f1 = f$(v/{v - v_s})$ and f2 = f$(v/{v + v_s})$;
So the frequency of the whistle suddenly changes from f1 to f2.
Question : 2
The fastest mode of transfer of heat is
a) radiation
b) conduction
c) convection
d) None of these
Answer »Answer: (a)
Question : 3
In which of the following option sound may not be across travel?
a) Vacuum
b) Iron
c) Water
d) Air
Answer »Answer: (a)
Question : 4
The red colour of the Sun at Sunset and Sunrise is due to
a) Total internal reflection of light
b) Refraction of light
c) Scattering of light
d) Dispersion of light
Answer »Answer: (c)
Question : 5
Assertion (A):
The handle of pressure cooker is made up of Abonite.
Reason (R):
Abonite is a hard material.
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)
Question : 6
If a tunnel is dug along the diameter of earth and a piece of stone is dropped into it, then the stone will
a) start oscillating about the centre of the earth
b) come out of the another end of the earth and will escape out in space
c) come to rest at the centre of the earth
d) stop at another end of the earth
Answer »Answer: (a)
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