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Important Questions Test: Light - Class 7 MCQ


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20 Questions MCQ Test Science Class 7 - Important Questions Test: Light

Important Questions Test: Light for Class 7 2024 is part of Science Class 7 preparation. The Important Questions Test: Light questions and answers have been prepared according to the Class 7 exam syllabus.The Important Questions Test: Light MCQs are made for Class 7 2024 Exam. Find important definitions, questions, notes, meanings, examples, exercises, MCQs and online tests for Important Questions Test: Light below.
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Important Questions Test: Light - Question 1

Surfaces used in study of reflection of light are

Detailed Solution for Important Questions Test: Light - Question 1

Polished surface reflects light. 

Important Questions Test: Light - Question 2

Normally a plane mirror forms

Detailed Solution for Important Questions Test: Light - Question 2

The image formed by a plane mirror is always virtual (meaning that the light rays do not actually come from the image)

Important Questions Test: Light - Question 3

A parallel beam of rays falling on a concave lens

Detailed Solution for Important Questions Test: Light - Question 3

A concave lens is a diverging lens.  A diverging lens is a concave lens that causes a ray from the tip of an object to appear to diverge from the first principal focus after refraction.

Important Questions Test: Light - Question 4

Shaving mirrors are

Detailed Solution for Important Questions Test: Light - Question 4

Acc. to ncert textbook, Concave mirrors are commonly used in torches, search-lights and vehicles headlights to get powerful parallel beams of light. They are often used as shaving mirrors to see a larger image of the face. The dentists use concave mirrors to see large images of the teeth of patients. Large concave mirrors are used to concentrate sunlight to produce heat in solar furnaces.

Important Questions Test: Light - Question 5

White light breaks up into seven colours due to

Detailed Solution for Important Questions Test: Light - Question 5

The dispersion of light is the phenomenon of splitting of a beam of white light into its seven constituent colours when passed through a transparent medium.

Important Questions Test: Light - Question 6

Which of the following is used as side view mirror in vehicles?

Detailed Solution for Important Questions Test: Light - Question 6

Convex mirror gives wider range of view, therefore it is used as a side view mirror in car. 

Important Questions Test: Light - Question 7

The type of lens, which is thicker in the middle and thinner at the edges and is used as magnifying glass, is called

Detailed Solution for Important Questions Test: Light - Question 7

They use convex lens because it appears thick in middle and thin at corner and that's why it is used as magnifying glass and also used as the side mirror of the vehicle.

Important Questions Test: Light - Question 8

Lens

Detailed Solution for Important Questions Test: Light - Question 8

Lens is an optically transparent medium whose one or both surfaces are spherical.

Important Questions Test: Light - Question 9

What kind of mirror provides images of large areas and is used for security?

Detailed Solution for Important Questions Test: Light - Question 9
Explanation:

  • Convex Mirror: Convex mirrors provide images of large areas and are commonly used for security purposes.

  • Wide Field of View: Convex mirrors have a wider field of view compared to concave mirrors and plane mirrors, making them suitable for monitoring and surveillance.

  • Security Applications: Convex mirrors are often placed in areas like parking lots, stores, and intersections to enhance security by allowing individuals to see a larger area at once.

  • Reflection: Convex mirrors reflect light outwards, creating a virtual image that is smaller than the actual object being reflected.

  • Prevention: The use of convex mirrors can help prevent theft, accidents, and other security concerns by providing a broader view of the surroundings.

Important Questions Test: Light - Question 10

If the angle between the incident ray and the normal to the plane of the mirror is 40, the angle between the incident ray and the reflected ray will be

Detailed Solution for Important Questions Test: Light - Question 10

Angle between incidence is equal to the angle of reflection.If angle between incidence and normal is 40° the angle between incidence and reflection is

=40°+40°

=80°

Important Questions Test: Light - Question 11

Which of the following can form real images?

Detailed Solution for Important Questions Test: Light - Question 11

Real images can be produced by convex lens, only if the object is placed further away from the lens than the focal point, and this real image is inverted.

Important Questions Test: Light - Question 12

Which of the following would you prefer to use while reading small letters found in a dictionary?

Detailed Solution for Important Questions Test: Light - Question 12

A convex lens gives a magnified image of an object when it is placed between the radius of curvature and focal length.

Important Questions Test: Light - Question 13

Which of the following materials cannot be used to make a lens?

Detailed Solution for Important Questions Test: Light - Question 13

If the lens is made up of clay the light rays cannot pass.

Important Questions Test: Light - Question 14

Light is

Detailed Solution for Important Questions Test: Light - Question 14

Every form of electromagnetic radiation, including visible light,light is a transverse wave as the direction of the wave is perpendicular to the direction of propogation and Light is composed of photons, which have no mass, so therefore light has no mass.

Important Questions Test: Light - Question 15

The speed of light is

Detailed Solution for Important Questions Test: Light - Question 15

The speed of light in vacuum is 300,000,000 m/s and in theory nothing can travel faster than light.

Important Questions Test: Light - Question 16

Rectilinear propagation is

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mode of travelling in straight lines

Important Questions Test: Light - Question 17

Which of the following is a reflector of light?

Detailed Solution for Important Questions Test: Light - Question 17

Moon does not have any light of its own; it reflects the light of the sun.

Important Questions Test: Light - Question 18

We can see the objects only when

Detailed Solution for Important Questions Test: Light - Question 18

reflected light reaches our eyes

Important Questions Test: Light - Question 19

The surfaces which cannot produce clear images are called

Detailed Solution for Important Questions Test: Light - Question 19

Smooth surfaces reflect light, and rough surfaces do not.Therefore surfaces cannot produce clear images.

Important Questions Test: Light - Question 20

In order to be used as mirrors, glasses are coated with

Detailed Solution for Important Questions Test: Light - Question 20

Silver is shiny and is a good reflector. It reflects about 90 percent of light falling on it. That is why, it is used for making high reflecting mirrors. one surface of the mirror is silvered because it helps the light rays to reflect.

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