set 16 MCQ Questions & Answers Detailed Explanation
MOST IMPORTANT general science mcq - 16 EXERCISES
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The following question based on light, heat, thermodynamics, wave motion, sound, optics & oscillations topic of general science mcq
(a) Frequency
(b) Wavelength
(c) Amplitude
(d) None of these
The correct answers to the above question in:
Answer: (b)
Practice light, heat, thermodynamics, wave motion, sound, optics & oscillations (set 16) Online Quiz
Discuss Form
Read more light heat thermodynamics wave sound optics oscillation Based General Science Questions and Answers
Question : 1
The mirror used for the head light of a car is
a) cylindrical
b) spherical concave
c) plane
d) parabolic concave
Answer »Answer: (d)
Parabolic reflectors are used to collect energy from a distant source (for example sound waves or incoming starlight) and bring it to a common focal point, thus correcting spherical aberration found in simpler spherical reflectors.
Since the principles of reflection are reversible, parabolic reflectors can also be used to project the energy of a source at its focus outward in a parallel beam, used in devices such as spotlights and car headlights.
Question : 2
At sunrise or at sunset the sun appears to be reddish while at mid-day it looks white. This is because
a) refraction causes this phenomenon
b) scattering due to dust particles and air molecules causes this phenomenon
c) the sun is cooler at sunrise or at sunset
d) diffraction sends red rays to the earth at these times
Answer »Answer: (b)
Question : 3
Which one of the following combinations of aperture and shutter speed of a camera will allow the maximum exposure?
a) f-8, 1/250
b) f-16, 1/125
c) f-22, 1/60
d) f-5.6, 1/1000
Answer »Answer: (c)
Question : 4
The image formed by astronomical telescope is
a) Real and diminished
b) Virtual and magnified
c) Virtual and diminished
d) Real and magnified
Answer »Answer: (b)
Question : 5
In producing a pure spectrum, the incident light is passed through a narrow slit placed in the focal plane of an achromatic lens because a narrow slit
a) allows only one colour at a time
b) produces less diffraction
c) increases intensity
d) allows a more parallel beam when it passes through the lens
Answer »Answer: (d)
We know that C = sin-1 $(1/μ)$
Given iB > iA, ∴ μB < μA
So B is rarer and A is denser. Light will be totally reflected when it passes from A to B. Now critical angle for A to B
CAB = sin-1 $(1/_Bμ_A)$ = sin-1 $(_Aμ_B)$
sin-1 $(μ_B/μ_A)$ = sin-1 $({i_B}/i_A)$.
Question : 6
Two holes of unequal diameters d1 and d2 (d1 > d2 ) are cut in a metal sheet. If the sheet is heated,
a) d1 will increase, d2 will decrease
b) both d12 will decrease
c) both d1 and d2 will increase
d) d1 will decrease, d2 will increase
Answer »Answer: (c)
When a body is heated, the distance between any two points on it increases. The increase is in the same ratio for any set of two point.
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