PSEB Punjab Board Class 7 Science Textbook Solution Chapter 15 Light Exercise Questions and Answers
Q.1 Fill in the blanks:
(i) An image formed by a ………………….. mirror is always of the same size as that of an object.
Answer: plane.
(ii) In a plane mirror, the left hand of a person appears to be the ………………… hand in the image and ……………. hand appears to be the left hand in the image.
Answer: right, right.
(iii) The image formed by a convex mirror is always ………………… and ……………….. in size.
Answer: erect, smaller.
(iv) Convex lenses are ………………… in the middle and concave lenses are ………….. in the middle than at the edges.
Answer: thin, thick.
(v) A prism splits the white light into ……………….. colours.
Answer: seven
Q.2 True or false:
(i) There is reflection of light through a lens.
Answer: False
(ii) The ray of light coming towards the plane mirror is called the reflected ray.
Answer: False.
(iii) The image formed by a plane mirror is always in front of the mirror.
Answer: False
(iv) A concave mirror is a part of hollow sphere of glass, whose outer side is coated with silver layer and reflection takes place from the inside.
Answer: True
(v) Concave lens always forms a virtual, erect and smaller image of the object.
Answer: True
Q.3 Choose the correct answer.
(i) Which of the following does not show reflection of light ?
(a) Plane mirror
(b) Concave mirror
(c) Convex mirror
(d) Card board.
Answer: (d) Card board.
(ii) Which is used for rear view in cars and other vehicles:
(a) Concave mirror
(b) Convex mirror
(c) Convex lens
(d) Concave lens.
Answer: (b) Convex mirror.
(iii) The image of an object formed by a concave lens is always ?
(a) Real and diminished
(b) Virtual and larger
(c) Real and larger
(d) Virtual and diminished.
Answer: (d) Virtual and diminished.
(iv) The process of splitting of white light in seven colours on passing through a prism is called:
(a) Reflection of light
(b) Refraction of light
(c) Bending of light
(d) Dispersion of light.
Answer: (d) Dispersion of light.
Q.4 Match the following.
Answer:-
A) Mirror used by dentists :- 4. Concave
B) Rear view Mirror :- 3. Vehicles
C) Magnifying glass :- 2. Microscope
D) Concave lens :- 1. Spectacles
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I am jaskirat Kaur grewal from ludhian Punjab u don’t immasshion a question answer of this chapter please u try again including questions and answers
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Jaskirat Kaur grewal
Punjab , Ludhiana,dulay