CBSE Std 10 Study Materials, Online Learning, Question Papers, Classnotes, Practice Test, MCQ | Smartindia Educational Program : www.smartindia.net.in

Question-1
A person finds difficulty in seeing nearby objects clearly.His vision can be corrected by using spectacles containing :

(A) converging lenses	(B) diverging lenses
(C) prismatic lenses	(D) chromatic lenses

Question-2
Myopia can be corrected by using

(A) concave lenses	(B) contact lenses
(C) prismatic lenses	(D) convex lenses

Question-3
The red colour of the sun at the time of sunrise and sunset is because :

(A) red colour is least scattered	(B) blue colour is least scattered
(C) red colour is most scattered	(D) blue colour is most scattered

Question-4
The least distance of distinct vision for a young adult with normal vision is about :

(A) 25 m	(B) 2.5 cm
(C) 25 cm	(D) 2.5 m

Question-5
The sky appears to an astronaut in

(A) blue colour	(B) black
(C) Indigo	(D) white

Question-6
We can see the sun before the actual sunrise by about :

(A) 5 minutes	(B) 2 minutes
(C) 2 hours	(D) 20 minutes

Question-7
Instruments used in astronomical investigations are

(A) microscopes	(B) optical telescopes
(C) radio telescopes	(D) both (2) and (3)

Question-8
The stars appear higher in the sky than they actually are, due to :

(A) diffraction of light	(B) scattering of light
(C) refraction of light	(D) reflection of light

Question-9
The size of the pupil of the eye is adjusted by :

(A) cornea	(B) ciliary muscles
(C) optic nerve	(D) iris

Question-10
The atmospheric refraction of light causes the twinkling of :

(A) planets only	(B) stars only
(C) planets and stars	(D) stars and satellites

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Std 10

CBSE

Practice in Related Chapters
Light - Reflection and Refraction
Magnetic Effect of Electric Current
Electricity
The Human Eye and the Colourful World
Sources of Energy