CBSE Class 8 Science Chapter Wise Question Bank Set B

Assignment – 1

Q.1. Fill in the blanks:

(i) The study of light is known as _____________.

(ii) An image may be _____________ or _____________.

(iii) Image formed by plane mirror is always _____________ and _____________ and has the property of _____________.

(iv) Two parallel plane mirrors give rise to _____________ images.

(v) A normal eye can‘t see object closer than _________ cm.

Q.2. State True/False

(i) Light always travels in a straight line.

(ii) Most of materials show regular reflection when light strikes.

(iii) Spherical mirrors do not follow the laws of reflection.

(iv) A plane mirror image is called an upright image.

(v) A light ray never retraces its path.

(vi) The blind spot has no photo receptors.

(vii) An image formed at the retina of human eye leaves an impression for 1/10th of a minute.

Q.3. Give one word for the following:

(i) A perpendicular to the reflecting surface at the point of incidence.

(ii) The angle between reflected ray and normal.

(iii) The muscles which hold the eye lens in the human eye ball.

(iv) The defect of eye in which a person can see distant object clearly but not the nearby.

Assignment – 2

Q.1. Choose the correct option:

(i) The splitting of light into seven colours is called-

(a) reflection

(b) refraction

(c) dispersion

(d) deviation

(ii) In dispersion of white light by a prism, the coloured light which bends the least is

(a) yellow

(b) red

(c) violet

(d) green

(iii) The message of image formation at the retina of the eye is conveyed to the brain by

(a) ciliary muscles

(b) cornea

(c) retina

(d) optic nerves

(iv) The human eye forms the image of an object at its

(a) cornea

(b) iris

(c) pupil

(d) retina

(v) The change in focal length of the eye lens to focus image of objects at varying distances is done by the action of

(a) pupil

(b) retina

(c) ciliary muscles

(d) blind spot

(vi) The human eye can focus objects at different distances by adjusting the focal length of the eye lens. This is due to

(a) persistence of vision

(b) near sightedness

(c) accommodation

(d) far sightedness

(vii) The least distance of distinct vision for a young adult with normal vision is

(a) 25m

(b) 25cm

(c) 2.5m

(d) 2.5cm

Please refer to the link below for CBSE Class 8 Science Chapter Wise Question Bank Set B