NCERT Class 7 Science Chapter 15 Light Extra Questions and Answers
Class 7 Science Chapter 15 Extra Questions and Answers – Light. Here in this Page Class VII Students can Learn Extra Questions & Answer 15th Chapter Science fully Inside.
We Provided Here Light Science Chapter 15 Long Answer Type Question, Very Short Type Questions (VSA) / MCQ Type Questions, Short Type Questions (SA).
Class 7 Science Chapter 15 Extra Question with Answer – Light
Science Chapter 15 Light Class 7 Inside 5 Marks, 3 marks, 2 Marks & And 1 Marks Important Questions and Answers.
1) Fill in the blanks:
a) Light travels along ___ lines. (Straight)
b) A ___ lens can form real and inverted image. (Convex)
c) The reflectors of torches are ___ in shape. (Concave)
d) White light is composed of ___ colors. (7)
2) Multiple choice questions:
a) Image formed by a convex ___ is always virtual and smaller in size?
a) Lens b) Mirror
Ans. b) Mirror
b) An image formed by a ___ mirror is always of the same size as that of the object?
a) Plane b) Curve
Ans. a) Plane
c) A ___ mirror can form a virtual image?
a) Concave b) Convex
Ans. a) Concave
d) ___lens is used as a magnifying glass?
a) Concave b) Convex
Ans. b) Convex
3) Answer the following questions:
a) What do you mean by real and virtual image?
Ans. An image which can be obtained on a screen is called a real image and an image which cannot be obtained on a screen is called a virtual image.
b) Why the word ‘AMBULANCE’ is written as ‘ECNALUBMA’?
Ans. The word ‘AMBULANCE’ is written as ‘ECNALUBMA’ because when the driver of vehicle ahead of an ambulance looks in her/his rear view mirror, she/he can read ‘AMBULANCE’ written on it and give way to it.
c) Why a convex lens and a concave lens are called covering lens and diverging lens respectively?
Ans. A convex lens coverages the light generally falling on it. Therefore it is called covering lens. On the other hand, a concave lens diverges the light and is called diverging lens.
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d) How convex lens is different from concave lens? Give two reasons.
Ans. Convex lens is different from concave lens because,
(i) Convex lens is covering lens while concave lens is diverging lens.
(ii) Convex lens forms real image while concave lens forms virtual images.
4) Match the following information of column I with the items of column II:
Column I |
Column II |
a) Formed images are magnified
lens |
i) Concave
|
b) Formed images are virtual | ii) Rainbow |
c) Image formed by a plane | iii) Lens |
d) Used in spectacles | iv) Convex lens |
e) Have 7 colors |
v) Erect |
Ans. a) – iv), b) – i), c) – v), d) – iii), e) – ii).
5) Mark your answer as per the codes provide below:
a) A: The convex lens is called a magnifying glass.
R: The convex lens is used to see object magnified.
I) Both A and R are true and R is the correct explanation of A.
II) Both A and R are true but R is not the correct explanation of A.
III) A is true but R is false.
IV) A is false but R is true.
V) Both A and R are false.
Ans. I. Both A and R are true and R is the correct explanation of A.
b) A: The convex mirrors are used as side mirrors in automobiles.
R: The convex mirrors can form images of objects spread over a large area which help the drivers to see the traffic behind them.
I) Both A and R are true and R is the correct explanation of A.
II) Both A and R are true but R is not the correct explanation of A.
III) A is true but R is false.
IV) A is false but R is true.
V) Both A and R are false.
Ans. I. Both A and R are true and R is the correct explanation of A.
6) The rainbow is seen as a large arc in the sky with many colors. When observed carefully, there are seven colors in a rainbow, though it may not be easy to distinguish all of them. These are – red, orange, yellow, green, blue, indigo and violet.
a) There are ___ colors in a rainbow. (Seven)
b)Which colors are there in a rainbow?
Ans. These are red, orange, yellow, green, blue, indigo and violet in a rainbow.
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