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

Questions : 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

The correct answers to the above question in:

Answer: (c)

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Read more light heat thermodynamics wave sound optics oscillation Based General Science Questions and Answers

Question : 1

Rear-view mirror used in a vehicle is a

a) plane mirror

b) concave mirror

c) convex mirror

d) None of these

Answer: (c)

Question : 2

The least distance (in cm) of distinct vision in

a) 75

b) 5

c) 25

d) 100

Answer: (c)

Question : 3

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: (c)

Question : 4

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: (b)

Question : 5

The mirror used for the head light of a car is

a) cylindrical

b) spherical concave

c) plane

d) parabolic concave

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 : 6

What is the distance between two successive crests or successive troughs called?

a) Frequency

b) Wavelength

c) Amplitude

d) None of these

Answer: (b)

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