Find here the Most Important NCERT chapter-wise Multiple Choice Questions from Class 10 Science with Answers Pdf free download. this may assist you to understand and check your knowledge about the chapters Most Important MCQ. Students also can take a free test of the Multiple Choice Questions of The chapters Most Important MCQ. Each question has four options followed by the right answer. These Most Important MCQ Questions are selected supported by the newest exam pattern as announced by CBSE.
Q1. The splitting of white light into its component colours is called
(a) refraction
(b) reflation
(c) dispersion
(d) tyndall effect
(c) dispersion
Q2. At noon the sun appears white as
a) light is least scattered.
(b) all the colours of the white light are scattered away.
(c) blue colour is scattered the most.
(d) red colour is scattered the most.
a) light is least scattered.
Q3. Which of the following phenomena of light are involved in the formation of a rainbow?
(a) Reflection, refraction and dispersion
(b) Refraction, dispersion and total internal reflection
(c) Refraction, dispersion and internal reflection
(d) Dispersion, scattering and total internal reflection
(c) Refraction, dispersion and internal reflection
Q4. Twinkling of stars is due to atmospheric
(a) dispersion of light by water droplets
(b) refraction of light by different layers of varying refractive indices
(c) scattering of light by dust particles
(d) internal reflection of light by clouds
(b) refraction of light by different layers of varying refractive indices
Q5. The clear sky appears blue because
(а) blue light gets absorbed in the atmosphere.
(b) ultraviolet radiations are absorbed in the atmosphere.
(c) violet and blue lights get scattered more than lights of all other colours by the atmosphere.
(d) light of all other colours is scattered more than the violet and blue colour lights by the atmosphere.
(c) violet and blue lights get scattered more than lights of all other colours by the atmosphere.
Q6. Which of the following statements is correct regarding the propagation of light of different colours of white light in air?
(a) Red light moves fastest.
(b) Blue light moves faster than green light.
(c) All the colours of the white light move with the same speed.
(d) Yellow light moves with the mean speed as that of the red and the violet light.
(c) All the colours of the white light move with the same speed.
Q7. The danger signals installed at the top of tall buildings are red in colour. These can be easily seen from a distance because among all other colours, the red light
(a) is scattered the most by smoke or fog.
(b) is scattered the least by smoke or fog.
(c) is absorbed the most by smoke or fog.
(d) moves fastest in air.
(b) is scattered the least by smoke or fog.
Q8. Which of the following phenomena contributes significantly to the reddish appearance of the sun at sunrise or sunset?
(a) Dispersion of light
(b) Scattering of light
(c) Total internal reflection of light
(d) Reflection of light from the earth
(b) Scattering of light
Q9. When a person is myopic, he/ she can clearly see
(a) both nearby and far off objects
(b) Only nearby objects
(c) only far off objects
(d) Neither nearby nor far off objects
(b) Only nearby objects
Q10. The ability of eye lens to adjust its focal length to form a sharp image of the object at varying distances on the retina is called
(a) Power of observation of the eye
(b) Power of adjustment of the eye
(c) Power of accommodation of the eye
(d) Power of enabling of the eye
(c) Power of accommodation of the eye
Q11. The image formed on the retina of the human eye is
(a) virtual and inverted
(b) real and inverted
(c) real and erect
(d) virtual and erect
(b) real and inverted
Q12. Bi-focal lens are required to correct
(a) astigmatism
(b) coma
(c) myopia
(d) presbyopia
(d) presbyopia
Q13. The colour that is scattered the least by the tiny particles and the atoms/ molecules of the atmosphere is
(a) Violet
(b) Green
(c) yellow
(d) Red
(d) Red
Q14. The human eye can focus objects at different distances by adjusting the focal length
of the eye lens. This is due to
(a) Presbyopia
(b) Accommodation
(c) Near-sightedness
(d) Far-sightedness
(b) Accommodation
Q15. The focal length of the eye lens increases when eye muscles.
(a) are relaxed and lens becomes thinner
(b) contract and lens becomes thicker
(c) are relaxed and lens becomes thicker
(d) Contract and lens becomes thinner.
(a) are relaxed and lens becomes thinner
Q16. The least distance of distinct vision for an eye lens is caused by the action of the
(a) 25 m
(b) 2.5 cm
(c) 25 cm
(d) 2.5 m
(c) 25 cm
Q17. The air layer of atmosphere whose temperature is less then the hot layer behave as optically
(a) denser medium
(b) rarer medium
(c) inactive medium
(d) either denser or rarer medium
(a) denser medium
Q18. The human eye forms the image of an object at its
(a) Cornea
(b) Iris
(c) Pupil
(d) Retina
(d) Retina
Q19. Image formed in normal eye of human is:
(a) on retina
(b) beyond retina
(c) behind retina
(d) at infinity.
(a) on retina
Q20. Far point for human eye is at:
(a) 25 cm
(b) 50 cm
(c) 100 cm
(d) infinity
(d) infinity
Q21. Minimum distance of clear vision is:
(a) 25 cm
(b) 2.5 cm
(c) 25 cm
(d) 2.5 cm
(c) 25 cm
Q22. The defect of long-sightedness is cured by:
(a) concave lens of definite focal length
(b) convex lens of definite focal length
(c) convex lens of any focal length
(d) concave lens of any focal length.
(b) convex lens of definite focal length
Q23. Eye lens is:
(a) converging
(b) diverging
(c) convex and concave
(d) none of these
(a) converging
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