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Important Questions Test: Light - Class 7 MCQ


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15 Questions MCQ Test - Important Questions Test: Light

Important Questions Test: Light for Class 7 2024 is part of 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

Which of the following is a reflector of light?

Detailed Solution for Important Questions Test: Light - Question 1

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

Important Questions Test: Light - Question 2

The surfaces which cannot produce clear images are called

Detailed Solution for Important Questions Test: Light - Question 2

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

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Important Questions Test: Light - Question 3

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

Detailed Solution for Important Questions Test: Light - Question 3

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.

Important Questions Test: Light - Question 4

What happens when light falls on a shiny surface?

Detailed Solution for Important Questions Test: Light - Question 4
  • When light falls on a shiny surface, it doesn't get absorbed or disappear.
  • Instead, it changes direction. Imagine light as a bouncy ball hitting a shiny wall – it bounces off in another direction.
  • This bouncing of light off shiny surfaces helps us see reflections and images around us. So, when light meets something shiny, it doesn't go through or vanish; it reflects and changes its path!
Important Questions Test: Light - Question 5

Light travels along a _____ line.

Detailed Solution for Important Questions Test: Light - Question 5

Light travels along a straight line means light moves in a direct path without bending or curving. Just like drawing a straight line from one point to another without any curves or turns.

Important Questions Test: Light - Question 6

State whether the following statement is True or False

Light can change its path when it falls on a shiny surface.

Detailed Solution for Important Questions Test: Light - Question 6
  • In the world around us, light can sometimes change its path when it falls on shiny objects. Imagine light like a bouncing ball.
  • When light hits a shiny surface, it can bounce off in a different direction, just like how a ball bounces off a wall.
  • This change in direction is called reflection of light.
  • So, when light falls on a shiny surface, it can indeed change its path, making the statement True.
Important Questions Test: Light - Question 7

What do you notice when you see your image in a mirror?

Detailed Solution for Important Questions Test: Light - Question 7

- When you see your image in a mirror, it appears exactly like you.
- However, the image is reversed left to right, known as lateral inversion.
- The size and proportions of the image match your real appearance.
- Mirrors reflect light, creating a virtual image that appears behind the mirror surface.
- The image will look the same in terms of height and width, assuming a flat mirror.
- Therefore, your image is exactly like you in size and appearance, just laterally inverted.

Important Questions Test: Light - Question 8

The image in a plane mirror is _____.

Detailed Solution for Important Questions Test: Light - Question 8

The image in a plane mirror is erect, which means it is the same way up as the object you see in the mirror.

Important Questions Test: Light - Question 9

State whether the following statement is True or False:

Boojho saw his image in a plane mirror. The image he saw was smaller than him.

Detailed Solution for Important Questions Test: Light - Question 9
  • When Boojho saw his image in a plane mirror, the image he saw was actually of the same size as him. In a plane mirror, the size of the image is the same as the size of the object.
  • So, the statement is False.
  • The mirror shows exactly the same size of the object, not smaller or larger.
Important Questions Test: Light - Question 10

What is the reflecting surface of a bell where Boojho observed his image?

Detailed Solution for Important Questions Test: Light - Question 10
  • Convex surfaces are outwardly curved, like the outer surface of a bell. When light reflects off a convex surface, it diverges, and any image formed will be virtual, smaller, and upright. This is likely the type of surface where Boojho saw his reflection.

  • Flat surfaces produce images that are the same size as the object, which is unlikely in the case of a bell.

  • Concave surfaces are inwardly curved and can produce magnified images depending on the position of the object relative to the surface, which doesn't fit the description for a bell's outer surface.

  • Rough surfaces generally scatter light in many directions and do not form a clear image.

Therefore, the correct answer is Convex.

Important Questions Test: Light - Question 11

Concave mirrors are used by doctors to examine __________.

Detailed Solution for Important Questions Test: Light - Question 11

Concave mirrors are used by the doctors for examining eyes, ears, nose and throat. Concave mirrors are used to obtain an enlarged image of these organs.

Important Questions Test: Light - Question 12

State whether the following statement is True or False:

Light can pass through both convex and concave lenses.

Detailed Solution for Important Questions Test: Light - Question 12
  • Yes, light can pass through both convex and concave lenses.
  • Convex lenses are thicker in the middle and thinner at the edges, like a magnifying glass, while concave lenses are thinner in the middle and thicker at the edges.
  • Convex lenses can converge light rays, bringing them together, while concave lenses diverge light rays, spreading them apart.
  • So, it is True that light can pass through both convex and concave lenses, helping us see things differently!
Important Questions Test: Light - Question 13

What happens when you hold a convex lens in the path of sunrays and adjust the distance between the lens and a sheet of paper until you get a bright spot on the paper?

Detailed Solution for Important Questions Test: Light - Question 13
  • When you hold a convex lens in the path of sunrays and adjust the distance until you see a bright spot on the paper, the paper begins to burn.
  • This happens because the convex lens concentrates the sunlight on the paper, making it hot enough to start burning.
  • It's important to remember to be very careful when working with lenses and sunlight as they can get very hot and cause burns.
Important Questions Test: Light - Question 14

A convex lens converges light and is also known as a ____ lens.

Detailed Solution for Important Questions Test: Light - Question 14

A convex lens is a type of lens that bends light inwards, bringing it together at a focal point. This lens is called a converging lens because it makes light rays converge or come together at a point. When light passes through a convex lens, it focuses the light to create an image.

Important Questions Test: Light - Question 15

State whether the following statement is True or False:

A convex lens bends light inward and is called a converging lens.

Detailed Solution for Important Questions Test: Light - Question 15
  • When light goes through a curved glass (like a magnifying glass), it bends inwards.
  • This is what we call a converging lens, just like how a convex lens works.
  • So, the statement is True!
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