Test: Light - 2 - UPSC MCQ

# Test: Light - 2 - UPSC MCQ

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## 20 Questions MCQ Test Science & Technology for UPSC CSE - Test: Light - 2

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

### Which of the following travels faster?

Detailed Solution for Test: Light - 2 - Question 1

Speed of light in air is 3,00,000 km/s which is much faster than speed of sound, jet airplane and supersonic planes.

Test: Light - 2 - Question 2

### Braille system is used by

Detailed Solution for Test: Light - 2 - Question 2

Braille system is used by blind people. It consists of dots which are touched by blind people to read the writing.

Test: Light - 2 - Question 3

### _________ refers to collection of rays.

Detailed Solution for Test: Light - 2 - Question 3

Beam is collection of rays originating from a source of light.

Test: Light - 2 - Question 4

Light always travels in straight line. This property is called

Detailed Solution for Test: Light - 2 - Question 4

Light always travels in straight line. This property is called rectilinear propagation of light.

Test: Light - 2 - Question 5

What makes the object visible?

Detailed Solution for Test: Light - 2 - Question 5

Light makes the object visible. In absence of light we are not able to view the object present in our surrounding.

Test: Light - 2 - Question 6

Mirror reflection gives us

Detailed Solution for Test: Light - 2 - Question 6

Reflections are usually caused by shiny things, such as mirrors that show a reversed and clear image of whatever is placed in front of them.

Test: Light - 2 - Question 7

Angle of incidence is always

Detailed Solution for Test: Light - 2 - Question 7

During reflection of light, angle of incidence is always equal to angle of reflection.

Test: Light - 2 - Question 8

From a source light travels as rays which are

Detailed Solution for Test: Light - 2 - Question 8

From a source light travels as rays which are parallel beam of light. Light always travel in straight line.

Test: Light - 2 - Question 9

Normal is

Detailed Solution for Test: Light - 2 - Question 9

Perpendicular at the point of incident of light to the surface is called normal. Normal is an imaginary line.

Test: Light - 2 - Question 10

In a plane mirror image formed is

Detailed Solution for Test: Light - 2 - Question 10

In plane mirror, image is formed is always virtual and erect and equal in height. It also shows lateral inversion.

Test: Light - 2 - Question 11

The mirror used as rear view mirror in vehicle is

Detailed Solution for Test: Light - 2 - Question 11

Convex mirror is used as rear view mirror in vehicle as convex mirror form virtual and erect image of smaller size to cover large view filed.

Test: Light - 2 - Question 12

A number of rays from different direction assemble at point are called

Detailed Solution for Test: Light - 2 - Question 12

When a number of rays from different direction assemble at one point are called as convergent rays.

Test: Light - 2 - Question 13

The angle of reflection is equal to the angle of incidence

Detailed Solution for Test: Light - 2 - Question 13

During reflection of light, the angle of reflection is always equal to angle of incidence.

Test: Light - 2 - Question 14

Light travels in which direction?

Detailed Solution for Test: Light - 2 - Question 14

Light travels in straight line. This kind of travelling of light is called as rectilinear propagation of light.

Test: Light - 2 - Question 15

Which of the following object will produce regular reflection?

Detailed Solution for Test: Light - 2 - Question 15

Regular reflection is produced by smooth and polished surface like mirror. The reflected rays of light are always parallel to each other in regular reflection.

Test: Light - 2 - Question 16

If you stand before a plane mirror, your left hand appears right. This phenomenon is

Detailed Solution for Test: Light - 2 - Question 16

In plane mirror, left sided object appear right sided. This phenomenon of changing side is called lateral inversion of light.

Test: Light - 2 - Question 17

Which of the following have reflecting surface?

Detailed Solution for Test: Light - 2 - Question 17

Plane mirrors have a flat reflecting surface whereas spherical mirrors have curved reflecting surfaces.

Test: Light - 2 - Question 18

__________ refers to collection of rays.

Detailed Solution for Test: Light - 2 - Question 18

Collection of rays originating from a source of light and moving parallel to each other is called beam of light.

Test: Light - 2 - Question 19

Which of the following substance change the direction of light?

Detailed Solution for Test: Light - 2 - Question 19

Mirror is a reflecting object that changes the direction of light falling on it. Lens, thin plastic sheet and water are transparent and allow light to pass through it.

Test: Light - 2 - Question 20

Which of the following statement is correct:

Detailed Solution for Test: Light - 2 - Question 20
Explanation:
The correct statement is D: Angle of incidence is always equal to angle of reflection. This is known as the Law of Reflection, which states that when a ray of light reflects off a surface, the angle of incidence is equal to the angle of reflection. Here is the detailed explanation:
Law of Reflection:
- The angle of incidence is the angle between the incident ray and the normal line drawn perpendicular to the surface at the point of incidence.
- The angle of reflection is the angle between the reflected ray and the normal line drawn perpendicular to the surface at the point of incidence.
- According to the Law of Reflection, the angle of incidence is always equal to the angle of reflection.
Reasoning:
- When light strikes a smooth surface, such as a mirror or a polished metal surface, it undergoes regular reflection.
- Regular reflection occurs when the surface is smooth and the incident light rays are parallel to each other.
- In regular reflection, the angle of incidence is equal to the angle of reflection.
- This is why we see a clear and well-defined reflection in a mirror or a polished surface.
Examples:
- When a light ray strikes a mirror at an angle of 30 degrees with the normal, it will be reflected at an angle of 30 degrees with the normal in the opposite direction.
- If the angle of incidence is 45 degrees, the angle of reflection will also be 45 degrees.
Applications:
- The Law of Reflection is used in various applications, such as designing mirrors, optical devices, and studying the behavior of light.
- It helps in understanding how light interacts with different surfaces and how we perceive reflections.
Conclusion:
The correct statement is D: Angle of incidence is always equal to angle of reflection. This is a fundamental principle in the study of light and its behavior when it interacts with surfaces.

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