Light MCQ question and answer with solution

81

The radius of curvature of the plane mirror is

A) Zero B) One C) Infinity D) Between one and infinity

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Answer & Solution

Answer: Option C

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82

An object at 1.2 cm height is placed 30 cm before a concave mirror of focal length of 20 cm to get a real image at a distance of 60 cm from the mirror. What is the height of the image formed?

A) -2.4 cm B) 1.2 cm C) -3.6 cm D) 2.4 cm

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Answer & Solution

Answer: Option A

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83

A convex mirror focal length f (in air), is immersed in a fluid $$\left( {\mu = \frac{4}{3}} \right)$$ . The focal length of the mirror in liquid will be-

A) $$\left( {\frac{3}{4}} \right)f$$ B) $$\left( {\frac{4}{3}} \right)f$$ C) $$\left( {\frac{7}{3}} \right)f$$ D) f

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Answer & Solution

Answer: Option B

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84

Rainbow is a natural phenomenon, which shows . . . . . . . .

A) Refraction B) Reflection C) Diffraction D) Scattering

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Answer & Solution

Answer: Option D

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85

The Sky appears blue due to

A) Blue colour is scattered most B) The red colour is scattered most C) Blue light is minimum absorbed by atmosphere D) Red light is ultimately absorbed by atmosphere

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Answer & Solution

Answer: Option A

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86

When an object is placed outside the center of curvature of a concave mirror, the image will form:

A) apart from C B) in C C) on focus D) between F and C

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Answer & Solution

Answer: Option D

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87

Given below are two statements, one labelled as Assertion (A) and other labelled as Reason (R).
Assertion (A): A diamond sparkles more than a glass imitation cut to the same shape.
Reason (R): The refractive index of diamond is less than that of glass.
In the context of the above two statements, which one of the following is correct?

A) Both (A) and (R) are true and (R) is the correct explanation of (A) B) Both (A) and (R) are true, but (R) is not the correct explanation of (A) C) (A) is true, but (R) is false D) (A) is false, but (R) is true

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Answer & Solution

Answer: Option C

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88

The time taken to reach the Sunlight up to the surface of Earth is approximately

A) 4.2 sec B) 4.8 sec C) 8.S minutes D) 3.6 hours

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Answer & Solution

Answer: Option C

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89

What will be the focal length when human eye lens becomes thin?

A) Increases B) Decreases C) Remain same D) No option is correct

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Answer & Solution

Answer: Option A

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90

In the visible spectrum, the colour having the shortest wavelength is

A) Red B) Yellow C) Blue D) Violet

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Answer & Solution

Answer: Option D

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Light MCQ question and answer with solution | Physics Gk MCQs