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) plane mirror
(b) concave mirror
(c) convex mirror
(d) None of these
The correct answers to the above question in:
Answer: (c)
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 least distance (in cm) of distinct vision in
a) 75
b) 5
c) 25
d) 100
Answer »Answer: (c)
Question : 2
Maximum temperature inside pressure cooker depends on
a) Area of hole on the top and food being cooked
b) Weight kept on hole at top and food being cooked
c) Area of hole on the top and weight kept on it
d) Area of hole on the top only
Answer »Answer: (c)
Question : 3
The reflection of sound is called echo. Which of the following conditions is/ are necessary for the formation of echo?
- The minimum distance between the source of sound and the reflecting body should be 17 m.
- The wavelength of sound should be less than the height of the reflecting body.
a) 1 and 2 both
b) 1 only
c) 2 only
d) None
Answer »Answer: (a)
The minimum distance between source and reflector of sound is given by,
ddim= $vt/2$
Question : 4
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 : 5
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 : 6
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.
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