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Assertion & Reason Test: The Human Eye & the Colourful World - 1 - Class 10 MCQ


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15 Questions MCQ Test - Assertion & Reason Test: The Human Eye & the Colourful World - 1

Assertion & Reason Test: The Human Eye & the Colourful World - 1 for Class 10 2024 is part of Class 10 preparation. The Assertion & Reason Test: The Human Eye & the Colourful World - 1 questions and answers have been prepared according to the Class 10 exam syllabus.The Assertion & Reason Test: The Human Eye & the Colourful World - 1 MCQs are made for Class 10 2024 Exam. Find important definitions, questions, notes, meanings, examples, exercises, MCQs and online tests for Assertion & Reason Test: The Human Eye & the Colourful World - 1 below.
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Assertion & Reason Test: The Human Eye & the Colourful World - 1 - Question 1

Directions: In the following questions, a statement of assertion (A) is followed by a statement of reason (R). Mark the correct choice as:

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.

Detailed Solution for Assertion & Reason Test: The Human Eye & the Colourful World - 1 - Question 1

The ability of the eye lens to focus clearly on the retina by adjusting its focal length is known as the power of accommodation.

Assertion & Reason Test: The Human Eye & the Colourful World - 1 - Question 2

Directions: In the following questions, a statement of assertion (A) is followed by a statement of reason (R). Mark the correct choice as:

Assertion (A): Concave lens is used to correct myopia or short- sightedness.

Reason (R): A concave lens of suitable focal length diverges the parallel rays from the distant objects as if they are coming from the far point of the myopic eye. This helps the eye lens to form a clear image at the retina.

Detailed Solution for Assertion & Reason Test: The Human Eye & the Colourful World - 1 - Question 2
A concave lens of suitable focal length diverges the parallel rays from the distant objects as if they are coming from the far point of the myopic eye. This helps the eye lens to form a clear image at the retina. So, a concave lens is used to correct myopia or short- sightedness.
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Assertion & Reason Test: The Human Eye & the Colourful World - 1 - Question 3

Directions: In the following questions, a statement of assertion (A) is followed by a statement of reason (R). Mark the correct choice as:

Assertion (A): A white light on passing through prism splits into its component colours as such that the red light emerges nearest to the base of the prism.

Reason (R): Wavelength of red light is more than other component colours and hence, red light deviates least.

Detailed Solution for Assertion & Reason Test: The Human Eye & the Colourful World - 1 - Question 3
Dispersion takes place because the refractive index of medium for different wavelengths (colours) is different. The refractive index is inversely proportional to l Since lred is more than other colours wavelength. So, deviation is least for red and it appears farthest from the base of the prism.
Assertion & Reason Test: The Human Eye & the Colourful World - 1 - Question 4

Directions: In the following questions, a statement of assertion (A) is followed by a statement of reason (R). Mark the correct choice as:

Assertion (A): In the 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.

Detailed Solution for Assertion & Reason Test: The Human Eye & the Colourful World - 1 - Question 4
The rainbow is formed when light at the inner surface of the water drop gets internally reflected. If the angle between the refracted ray and normal to the drop surface is greater than the critical angle.
Assertion & Reason Test: The Human Eye & the Colourful World - 1 - Question 5

Direction: In the Following Questions, A Statement of Assertion (A) Is Followed by A Statement of Reason (R). Mark The Correct Choice As:

Assertion : Hypermetropia is the defect of the eye in which only farther objects are seen.

Reason : Hypermetropia is corrected by using converging lenses.

Detailed Solution for Assertion & Reason Test: The Human Eye & the Colourful World - 1 - Question 5
Both assertion (A) and reason (R) are true but reason (R) is not the correct explanation of assertion (A).
Assertion & Reason Test: The Human Eye & the Colourful World - 1 - Question 6

Direction: In the Following Questions, A Statement of Assertion (A) Is Followed by A Statement of Reason (R). Mark The Correct Choice As:

Assertion : Myopia is due to the increased converging power of the eye lens.

Reason : Myopia can be corrected by using spectacles made from concave lenses.

Detailed Solution for Assertion & Reason Test: The Human Eye & the Colourful World - 1 - Question 6
Both assertion (A) and reason (R) are true but reason (R) is not the correct explanation of assertion (A). In the Myopia eye due to the increased converging power of the eye lens, the image of a far off object is formed in front of the retina. Myopia can be corrected by using spectacles made from concave lenses.
Assertion & Reason Test: The Human Eye & the Colourful World - 1 - Question 7

Direction: In the Following Questions, A Statement of Assertion (A) Is Followed by A Statement of Reason (R). Mark The Correct Choice As:

Assertion : Myopia is the defect of the eye in which only nearer objects are seen by the eye.

Reason : The eyeball is elongated.

Detailed Solution for Assertion & Reason Test: The Human Eye & the Colourful World - 1 - Question 7
Both assertion (A) and reason (R) are true and reason (R) is the correct explanation of assertion (A)
Assertion & Reason Test: The Human Eye & the Colourful World - 1 - Question 8

Direction: In the Following Questions, A Statement of Assertion (A) Is Followed by A Statement of Reason (R). Mark The Correct Choice As:

Assertion : The stars twinkle while the planet does not.

Reason : The stars are much bigger in size than the planets.

Detailed Solution for Assertion & Reason Test: The Human Eye & the Colourful World - 1 - Question 8
Both assertion (A) and reason (R) are true but reason (R) is not the correct explanation of assertion (A). As planets are of larger size than stars and much closer to the earth, planets can be considered as a collection of large number of point sized sources of light. The total variation in the amount of light entering our eye from all these individual point sized sources will average out to zero which nullifies the twinkling effect of each other. Therefore, planets do not twinkle.
Assertion & Reason Test: The Human Eye & the Colourful World - 1 - Question 9

Direction: In the Following Questions, A Statement of Assertion (A) Is Followed by A Statement of Reason (R). Mark The Correct Choice As:

Assertion : A normal human eye can clearly see all the objects beyond a certain minimum distance.

Reason : The human eye has the capacity of adjusting the focal length of eye lens.

Detailed Solution for Assertion & Reason Test: The Human Eye & the Colourful World - 1 - Question 9
Both assertion (A) and reason (R) are true and reason (R) is the correct explanation of assertion (A).
Assertion & Reason Test: The Human Eye & the Colourful World - 1 - Question 10

Direction: In the Following Questions, A Statement of Assertion (A) Is Followed by A Statement of Reason (R). Mark The Correct Choice As:

Assertion : Rainbow is an example of the dispersion of sunlight by the water droplets.

Reason : Light of shorter wavelength is scattered much more than light of larger wavelength.

Detailed Solution for Assertion & Reason Test: The Human Eye & the Colourful World - 1 - Question 10
Both assertion (A) and reason (R) are true but reason (R) is not the correct explanation of assertion (A).
Assertion & Reason Test: The Human Eye & the Colourful World - 1 - Question 11

Direction: In the Following Questions, A Statement of Assertion (A) Is Followed by A Statement of Reason (R). Mark The Correct Choice As:

Assertion : A normal human eye can clearly see all the objects beyond a certain minimum distance.

Reason : The human eye has the capacity to adjust suitable the focal length of its lens to a certain extent.

Detailed Solution for Assertion & Reason Test: The Human Eye & the Colourful World - 1 - Question 11
Both assertion (A) and reason (R) are true but reason (R) is not the correct explanation of assertion (A).
Assertion & Reason Test: The Human Eye & the Colourful World - 1 - Question 12

Direction: In the Following Questions, A Statement of Assertion (A) Is Followed by A Statement of Reason (R). Mark The Correct Choice As:

Assertion : The optical instruments are used to increase the size of the image of the object.

Reason : The optical instruments are used increase the visual angle.

Detailed Solution for Assertion & Reason Test: The Human Eye & the Colourful World - 1 - Question 12
Assertion (A) is false but reason (R) is true.
Assertion & Reason Test: The Human Eye & the Colourful World - 1 - Question 13

Direction: In the Following Questions, A Statement of Assertion (A) Is Followed by A Statement of Reason (R). Mark The Correct Choice As:

Assertion : The optical instruments are used to increase the size of the image of the object.

Reason : The optical instruments are used to increase the visual angle.

Detailed Solution for Assertion & Reason Test: The Human Eye & the Colourful World - 1 - Question 13
Assertion (A) is false but reason (R) is true. Optical instruments do not increase the size of the image of the object. It depends upon the distance between the object and objective lens.
Assertion & Reason Test: The Human Eye & the Colourful World - 1 - Question 14

Direction: In the Following Questions, A Statement of Assertion (A) Is Followed by A Statement of Reason (R). Mark The Correct Choice As:

Assertion : Sunlight reaches us without dispersion in the form of white light and not as its components.

Reason : Dispersion takes place due to variation of refractive index for different wavelength but in vacuum the speed of light is independent of wavelength and hence vacuum is a non-dispersive medium.

Detailed Solution for Assertion & Reason Test: The Human Eye & the Colourful World - 1 - Question 14
Both assertion (A) and reason (R) are true and reason (R) is the correct explanation of assertion (A). In vacuum speed of light is independent of wavelength, Hence, no dispersion takes places in vacuum. Thus, vacuum is a non-dispersive medium in which all colours travel with the same speed.
Assertion & Reason Test: The Human Eye & the Colourful World - 1 - Question 15

Direction: In the Following Questions, A Statement of Assertion (A) Is Followed by A Statement of Reason (R). Mark The Correct Choice As:

Assertion : The sky looks dark and black instead of blue in outer space.

Reason : No atmosphere containing air in the outer space to scatter sunlight.

Detailed Solution for Assertion & Reason Test: The Human Eye & the Colourful World - 1 - Question 15
Both assertion (A) and reason (R) are true and reason (R) is the correct explanation of assertion (A).
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