Light MCQ question and answer with solution

41

The diamond appears lustrous because of

A) Reflection B) Refraction C) Total internal reflection D) Scattering

Discuss

Answer & Solution

Answer: Option C

No explanation is given for this question. Let's Discuss on Board

42

Assertion (A): In a motion picture, usually 24 frames are projected every second over the whole length of the film.
Reason (R): An image formed on the retina of eye persists for about 0.1s after the removal of the stimulus.

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

Discuss

Answer & Solution

Answer: Option C

No explanation is given for this question. Let's Discuss on Board

43

What is the time difference between the actual passing of the sun over the horizon and out being able to see the image of it on earth?

A) 10 minute B) 8 minute C) 4 minute D) 2 minute

Discuss

Answer & Solution

Answer: Option D

No explanation is given for this question. Let's Discuss on Board

44

When the object is placed at . . . . . . . ., no image will form in the converging lens?

A) Focus point B) Twice the focal length C) More than twice the focal length D) Before the focus point

Discuss

Answer & Solution

Answer: Option A

No explanation is given for this question. Let's Discuss on Board

45

The magnification of a mirror must be . . . . . . . . for a virtual and erect image-

A) infinite B) negative C) positive D) zero

Discuss

Answer & Solution

Answer: Option C

No explanation is given for this question. Let's Discuss on Board

46

The focal length of a convex mirror is . . . . . . . .

A) zero B) negative C) positive D) infinite

Discuss

Answer & Solution

Answer: Option C

No explanation is given for this question. Let's Discuss on Board

47

Which colour is formed when Red and Green are mixed?

A) Light blue B) Yellow C) White D) Grey

Discuss

Answer & Solution

Answer: Option B

No explanation is given for this question. Let's Discuss on Board

48

The focal length of a convex lens is 2.5 m. Find its power.

A) 0.3 D B) 0.4 D C) 0.2 D D) 0.5 D

Discuss

Answer & Solution

Answer: Option B

No explanation is given for this question. Let's Discuss on Board

49

To get the real reflection, an object is placed at a distance of 30 cm from a concave mirror with a focal length of 20 cm. What will be the distance of image from mirror?

A) 60 cm B) 20 cm C) 30 cm D) 40 cm

Discuss

Answer & Solution

Answer: Option A

No explanation is given for this question. Let's Discuss on Board

50

A ray of light when refracted suffers change in velocity. In this context, which one among the following statements is correct?

A) Velocity increases as the ray passes from a rarer to a denser medium B) Velocity decreases as the ray passes from a denser to a rarer medium C) Velocity decreases as the ray passes from a rarer to a denser medium D) Change of velocity does not depend on the nature of medium

Discuss

Answer & Solution

Answer: Option C

No explanation is given for this question. Let's Discuss on Board

Light MCQ question and answer with solution | Physics Gk MCQs