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Assertion & Reason Test: The Human Eye & the Colourful World - 2 - Class 10 MCQ


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15 Questions MCQ Test - Assertion & Reason Test: The Human Eye & the Colourful World - 2

Assertion & Reason Test: The Human Eye & the Colourful World - 2 for Class 10 2024 is part of Class 10 preparation. The Assertion & Reason Test: The Human Eye & the Colourful World - 2 questions and answers have been prepared according to the Class 10 exam syllabus.The Assertion & Reason Test: The Human Eye & the Colourful World - 2 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 - 2 below.
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Assertion & Reason Test: The Human Eye & the Colourful World - 2 - 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): A hypermetropic person prefers to remove his spectacles, while driving.

Reason (R): When a hypermetropic person wearing the spectacles looks at a distant object, the parallel rays from the distant object get converged in front of the retina. The image thus appears blurred.

Detailed Solution for Assertion & Reason Test: The Human Eye & the Colourful World - 2 - Question 1
When a hypermetropic person wearing the spectacles looks at a distant object, the parallel rays from the distant object get converged in front of the retina. The image appears blurred, in order to avoid this, the person prefers to remove his spectacles.
Assertion & Reason Test: The Human Eye & the Colourful World - 2 - 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): Light from a distant object arriving at the eye lens may get converged at a point in front of the retina.

Reason (R): The eye is producing too much divergence in the incident beam.

Detailed Solution for Assertion & Reason Test: The Human Eye & the Colourful World - 2 - Question 2
The light from a distant object arriving at the eye lens may get converged at a point in front of the retina. This type of defect is called nearsightedness or myopia. This means that the eye is producing too much convergence in the incident beam.
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Assertion & Reason Test: The Human Eye & the Colourful World - 2 - 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): 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.

Detailed Solution for Assertion & Reason Test: The Human Eye & the Colourful World - 2 - Question 3
In vacuum speed of light is independent of wavelength. Hence, no dispersion takes place 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 - 2 - Question 4

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

Assertion : Blue colour of sky appears due to scattering of blue colour.

Reason : Blue colour has the shortest wavelength in the visible spectrum.

Detailed Solution for Assertion & Reason Test: The Human Eye & the Colourful World - 2 - Question 4
Both assertion (A) and reason (R) are true and reason (R) is the correct explanation of assertion (A). During the day time, sky appears blue. This is because the size of the particles in the atmosphere is smaller than the wavelength of visible light, so they scatter the light of shorter wavelengths. The scatter blue light enters our eye.
Assertion & Reason Test: The Human Eye & the Colourful World - 2 - 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 : Light from a distant object arriving at the eye lens may get converged at a point in front of the retina.

Reason : The eye is producing too much divergence in the incident beam.

Detailed Solution for Assertion & Reason Test: The Human Eye & the Colourful World - 2 - Question 5
Assertion (A) is true but reason (R) is false. The light from a distant object arriving at the eye lens may get converged at a point in front of the retina. This type of defect is called near-sightedness or myopia. This means that the eye is producing too much convergence in the incident beam.
Assertion & Reason Test: The Human Eye & the Colourful World - 2 - 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 : The light of violet colour deviates the most and the light of red colour the least, while passing through a prism.

Reason : For a prism material, the refractive index is highest for red light and lowest for the violet light.

Detailed Solution for Assertion & Reason Test: The Human Eye & the Colourful World - 2 - Question 6
Both assertion (A) and reason (R) are true but reason (R) is not the correct explanation of assertion (A). The light of violet colour deviates most and the light of red colour the least, while passing through a prism. For a prism material, the refractive index is highest for violet light and lowest for the red light.
Assertion & Reason Test: The Human Eye & the Colourful World - 2 - 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 : Secondary rainbow is fainter than primary rainbow.

Reason : Secondary rainbow formation is a three step process and hence, the intensity of light is reduced at the second reflection inside the raindrop.

Detailed Solution for Assertion & Reason Test: The Human Eye & the Colourful World - 2 - Question 7
Both assertion (A) and reason (R) are true and reason (R) is the correct explanation of assertion (A). Primary rainbow is a result of a three-step process. 1. Refraction at the first surface of raindrop. 2. Total internal reflection from the second surface of raindrop. 3. Again refraction from the first surface of raindrop from where the light finally emerges out. The intensity of light is reduced at the second reflection and hence, the secondary rainbow is fainter than the primary rainbow.
Assertion & Reason Test: The Human Eye & the Colourful World - 2 - 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 : There exists two angles of incidence for the same magnitude of deviation (except minimum deviation) by a prism kept in air.

Reason : In a prism kept in air, a ray is incident on the first surface and emerges out of the second surface. Now if another ray is incident on the second surface (of prism) along the previous emergent ray, then this ray emerges from the first surface along the previous incident ray. This particle is called the principle of reversibility of light.

Detailed Solution for Assertion & Reason Test: The Human Eye & the Colourful World - 2 - Question 8
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 - 2 - 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 rainbow is sometimes seen in the sky in rainy season only when observer’s back is towards the sun.

Reason : Internal reflection in the water droplets cause dispersion and the final rays are in backward direction.

Detailed Solution for Assertion & Reason Test: The Human Eye & the Colourful World - 2 - 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 - 2 - 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 : When we see an object, the image formed On the retina is real and inverted.

Reason : If the magnification of a system is less than one, then the image formed is inverted.

Detailed Solution for Assertion & Reason Test: The Human Eye & the Colourful World - 2 - Question 10
Assertion (A) is true but reason (R) is false. The image formed on retina is real and inverted. If magnification is less than 1, then diminished images is formed not inverted.
Assertion & Reason Test: The Human Eye & the Colourful World - 2 - 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 : The twinkling of stars is due to the fact that refractive index of the earth’s atmosphere fluctuates.

Reason : In cold countries, the phenomenon of looming (i.e., ship appears in the sky) takes place, because refractive index of air decreases with height.

Detailed Solution for Assertion & Reason Test: The Human Eye & the Colourful World - 2 - 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 - 2 - 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 resolving power of a telescope is more if the diameter of the objective lens is more.

Reason : Objective lens of large diameter coileds more light.

Detailed Solution for Assertion & Reason Test: The Human Eye & the Colourful World - 2 - Question 12
Both assertion (A) and reason (R) are true and reason (R) is the correct explanation of assertion (A). RP ∝ diameter of objective.
Assertion & Reason Test: The Human Eye & the Colourful World - 2 - 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 : Danger signals are made of red colour.

Reason : Velocity of red light in air is maximum, so signals are visible even in dark.

Detailed Solution for Assertion & Reason Test: The Human Eye & the Colourful World - 2 - Question 13
Assertion (A) is true but reason (R) is false.
Assertion & Reason Test: The Human Eye & the Colourful World - 2 - 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 : In case of rainbow, light at the inner surface of the water drop gets internally reflected.

Reason : The angle between the refracted ray and normal to the drop surface is greater than the critircal angle.

Detailed Solution for Assertion & Reason Test: The Human Eye & the Colourful World - 2 - Question 14
Both assertion (A) and reason (R) are true and reason (R) is the correct explanation of assertion (A). 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 - 2 - 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 : A white light on passing through a prism splits into its component colours as such that the red light emerges nearest to the base of the prism.

Reason : 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 - 2 - Question 15
Assertion (A) is false but reason (R) is true. Dispersion takes place because the refractive index of medium for different wavelengths (colours) is different. The refractive index is inversely proportional to l by Cauchy’s expression as

Hence, deviation (D) = (μ - 1)A Since λred is more than other colours wavelength. So, deviation is least for red and it appears farthest from the base of the prism.

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