1. Rainbow is caused due to –
(a) Reflection of sun light air
(b) Dispersion of sun light from water drops
(c) Refraction of sun light from water drops
(d) Diffraction of sun rays from water drops
2. In the visible spectrum the colour having the shortest wavelength is –
(a) Green
(b) Red
(c) Violet
(d) Blue
3. On entering a glass prism, sun rays are –
(a) Deviated but not dispersed
(b) Deviated and dispersed
(c) Dispersed but not deviated
(d) Neither deviated nor dispersed.
4. In case of hypermetropia –
(a) The image of near objects is formed in front of retina
(b) The image of near objects is formed behind the retina
(c) A concave lens should be used for correction
(d) A convex lens cannot be used for correction
5. Astigmatism can be corrected by –
(a) Bifocal lenses
(b) Cylindrical lenses
(c) Concave lenses
(d) Planoconvex lenses
6. The phenomenon of light in which light that strikes to smooth surface and thrown back into the same medium is called
(a) reflection
(b) refraction
(c) scattering
(d) none of these
7. A man wearing glasses of focal length +1m cannot clearly see beyond one meter –
(a) If he is far sighted
(b) If he is near sighted
(c) If his vision is normal
(d) In each of these cases
8. The image formed by convex lens in a simple microscope
(a) virtual and erect
(b) real and inverted
(c) equal in size with the object
(d) none of these
9. The mirror used in motor vehicles near the driver's seat is a
(a) concave mirror
(b) convex mirror
(c) plane mirror
(d) none of these
10. Light waves –
(a) Require air or another gas to travel through
(b) Require an electric field to travel through
(c) Require a magnetic field to travel through
(d) Can travel through perfect vacuum
Note : Answers will be updated soon....
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