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Olympiad Test: Light - 2 - Class 8 MCQ


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15 Questions MCQ Test - Olympiad Test: Light - 2

Olympiad Test: Light - 2 for Class 8 2024 is part of Class 8 preparation. The Olympiad Test: Light - 2 questions and answers have been prepared according to the Class 8 exam syllabus.The Olympiad Test: Light - 2 MCQs are made for Class 8 2024 Exam. Find important definitions, questions, notes, meanings, examples, exercises, MCQs and online tests for Olympiad Test: Light - 2 below.
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Olympiad Test: Light - 2 - Question 1

If a person is suffering from hypermetropia, which object he/she most likely to see blurred?

Detailed Solution for Olympiad Test: Light - 2 - Question 1

A distance of 10 cm cannot be the answer, as at this distance even the vision of a person with normal eyes will also get blurred. Therefore, the object placed at a distance of 25 cm from the eye will look blurry to a person suffering from hypermetropia.

Olympiad Test: Light - 2 - Question 2

At what position of the object does a convex lens act as a magnifying glass?

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Olympiad Test: Light - 2 - Question 3

A normal eye cannot clearly see objects closer than ___ cm.

Olympiad Test: Light - 2 - Question 4

How many dots does the Braille system use?

Olympiad Test: Light - 2 - Question 5

Which one of these controls the amount of light entering the eye?

Olympiad Test: Light - 2 - Question 6

When white light passes through a glass prism, it is

Olympiad Test: Light - 2 - Question 7

Myopia is corrected by using spectacles with

Olympiad Test: Light - 2 - Question 8

Because of which reflection do we see objects from every direction?

Olympiad Test: Light - 2 - Question 9

The second law of reflection states that

Detailed Solution for Olympiad Test: Light - 2 - Question 9

Second law of reflection: According to the second law, the angle of reflection is always equal to the angle of incidence. This ray of light will be reflected back along the same path.

Olympiad Test: Light - 2 - Question 10

The number of images formed by mirror at angle θ to each other is given by 

Olympiad Test: Light - 2 - Question 11

In which of these objects is plane mirror used?

Detailed Solution for Olympiad Test: Light - 2 - Question 11

- Looking Glass: A plane mirror is used in looking glasses to reflect a clear image of the person or object in front of it.

- Solar Cookers: Plane mirrors are used in solar cookers to reflect and concentrate sunlight onto a specific spot, increasing the temperature for cooking.

- Kaleidoscope: In a kaleidoscope, plane mirrors are placed at angles to create multiple reflections, resulting in beautiful, symmetrical patterns.

- Conclusion: All of these objects utilize plane mirrors for their respective functions. Therefore, the correct answer is D: all of these.

Olympiad Test: Light - 2 - Question 12

The body which absorbs some light incident on it and reflects the remaining light is

Detailed Solution for Olympiad Test: Light - 2 - Question 12

- An opaque object absorbs some of the light that hits it and reflects the rest.
- These objects do not allow light to pass through them, hence they are not transparent.
- The reflection from opaque objects can vary depending on their surface characteristics.
- A shining object reflects more light, often specularly, which might cause a glossy appearance.
- Rough surfaces scatter reflected light in many directions, but they are still opaque.
- Therefore, the correct answer is A: opaque.

Olympiad Test: Light - 2 - Question 13

A light year is the distance that light travels in one year and is equal to

Olympiad Test: Light - 2 - Question 14

Time taken for light to reach from the earth to the sun is

Olympiad Test: Light - 2 - Question 15

The brain of a human being interprets the image as

Detailed Solution for Olympiad Test: Light - 2 - Question 15

- The human brain interprets images formed on the retina.
- The lens of the eye projects an inverted image onto the retina.
- The brain processes this inverted image and flips it to perceive it as erect.
- The perceived size is generally consistent with our experience of the object’s size, thanks to mental processing.
- Therefore, the brain interprets the image as erect and of correct size, making option A the correct answer.

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