10 Question MCQ (including Assertion)

Question 1 of 10

CBSE Board Exam 2016

A person cannot see distinctly objects kept beyond 2m. This defect can be corrected by using a lens of power

A + 0.5 D B – 0.5 D C + 0.2 D D – 0.2 D

Select one option. Answers are shown after the test.

Question 2 of 10

CBSE Board Exam 2019

When we enter a dark room coming from outside, immediately the things inside the room do not appear clear to our eyes. This is because

A pupils do not open at all in the dark. B pupils take time to adjust. C light travels slower in a dark room. D pupils open very quickly in the dark.

Select one option. Answers are shown after the test.

Question 3 of 10

Assertion (A): In case of a rainbow, light at the inner surface of the water drop gets internally reflected.
Reason (R): The angle between the refracted ray and normal to the drop surface is greater than the critical angle.

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.

Select one option. Answers are shown after the test.

Question 4 of 10

Assertion (A): Eye lens has the ability to focus clearly on the retina by adjusting its focal length.
Reason (R): This phenomenon is known as the power of accommodation.

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.

Select one option. Answers are shown after the test.

Question 5 of 10

NCERT Exemplar

The danger signals installed at the top of tall buildings are red in colour. These can be easily seen from a distance because among all other colours, the red light

A is scattered the most by smoke or fog B is scattered the least by smoke or fog C is absorbed the most by smoke or fog D moves fastest in air

Select one option. Answers are shown after the test.

Question 6 of 10

Assertion (A): Light from a distant object arriving at the eye lens may converge at a point in front of the retina.
Reason (R): The eye is producing too much divergence in the incident beam.

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.

Select one option. Answers are shown after the test.

Question 7 of 10

Assertion (A): Sunlight reaches us without dispersion in the form of white light and not as its components.
Reason (R): Dispersion takes place due to variation of refractive index for different wavelengths but in vacuum the speed of light is independent of wavelength and hence vacuum is a non-dispersive medium.

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.

Select one option. Answers are shown after the test.

Question 8 of 10

NCERT Exemplar

Which of the following statements is correct regarding the propagation of light of different colours of white light in air?

A Red light moves fastest B Blue light moves faster than green light C All the colours of the white light move with the same speed D Yellow light moves with the mean speed as that of the red and the violet light

Select one option. Answers are shown after the test.

Question 9 of 10

NCERT Exemplar

Twinkling of stars is due to atmospheric

A dispersion of light by water droplets B refraction of light by different layers of varying refractive indices C scattering of light by dust particles D internal reflection of light by clouds

Select one option. Answers are shown after the test.

Question 10 of 10

NCERT Exemplar

Which of the following phenomena contributes significantly to the reddish appearance of the sun at sunrise or sunset?

A Dispersion of light B Scattering of light C Total internal reflection of light D Reflection of light from the earth

Select one option. Answers are shown after the test.

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10 Question MCQ (including Assertion)