Class 10 Human eye and prism objective question term 1
1. least distance of distinct vision for a normal eye is
(a) infinity (b) 2.5 cm (c) 205 cm (d) 25 Cm
2. A person cannot see distinctly objects kept beyond 2 m. This defect can be corrected by using a lens of power
(a) +0.5 D (b) -0.5 D (c) +0.2 D (d) NONE OF THESE
3. The splitting of white light into different colours on passing through a prism is called
(a) reflection (b) refraction (c) dispersion (d)NONE OF THESE
4. At noon, the Sun appears white as
(a) blue colour is scattered the most (b) red colour is scattered the most
(c) light is least scattered (d) all the colours of the white light
5. Twinkling of stars is due to
(a) reflection of light by clouds (b) scattering of light by dust particles
(c) dispersion of light by water drops (d) atmospheric refraction of starlight
6. When white light enters a glass prism from air, the angle of deviation is least for
(a) blue light (b) yellow light (c) violet light (d) red light
7. When white light enters a glass prism from air, the angle of deviation is maximum for
(a) blue light (b) yellow light (c) red light (d) violet light
10. The amount of light entering the eye can be controlled by the
(a) iris (b) pupil (c) cornea (d) ciliary muscles
10. What type of image is formed by the eye lens on the retina?
(a) Real and erect (b) Virtual and inverted (c) Real and inverted (d) Virtual and erect
11. The medical condition in which the lens of the eye of a person becomes progressively
cloudy resulting in blurred vision is called
(a) myopia (b) hypermetropia (c) presbyopia (d) cataract
12. The defect of the eye in which the eyeball becomes too long is
(a) myopia (b) hypermetropia (c) presbyopia (d) cataract
13. The defect of vision in which the image of nearby objects is formed behind the retina, is
(a) myopia (b) short-sightedness (c) hypermetropia (d) presbyopia
14. Which of the following is a natural phenomenon which is caused by the dispersion of sunlight in the sky?
(a) Twinkling of stars (b) Stars seem higher than they actually are
(c) Advanced sunrise and delayed sunset (d) Rainbow
15.Name the scientist who was the first to use a glass prism to obtain the spectrum of sunlight.
(a) Isaac Newton (b) Einstein (c) Kepler (d) Hans Christian Oersted
16. The image shows a light ray incident on a glass prism.
The various angles are labeled in the image. Which angle shows the angle of incidence and angle of refraction, respectively?
(a) A and D (b) B and E (c) C and F (d) D and F
17. The deflection of light by minute particles and molecules of the atmosphere in all directions is called ____________ of light.
(a) dispersion (b) scattering (c) interference (d) tyndall effect
Q18) 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
Q19) Why do stars appear to twinkle at night?
(a) because the light of stars travels in different medium
(b) because the distance of star varies when earth rotates
(c) because the star changes its position relative to earth
(d) because the atmosphere reflects the light at different angles
Q20) When white light enters a prism, it gets split into its constituent colours. This is due to
(a) different refractive index for different wavelength of each colour
(b) each colour has the same velocity in the prism.
(c) prism material has high density. (d) Scattering of light
Q21) When white light enters a glass prism from air, the angle of deviation is least for
(a) blue light (b) yellow light (c) violet light (d) red light
Q22) Which option justifies that the Sun appears red at sunrise and sunset?
(a) red scatters highest by the atmosphere
(b) the distance between the sun and earth reduces
(c) red has high wavelength, so it travels longer distance
(d) the white light disperses into seven colours, only red enters the atmosphere
Q23) 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
Q24) 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.
Q25) The image shows the dispersion of the white light in the prism.
What will be the colours of the X, Y and Z?
(a) X: red; Y: green; Z: violet
(b) X: violet; Y: green; Z: red
(c) X: green; Y: violet; Z: red
(d) X: red; Y: violet; Z: green
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