Q1. A concave lens always forms
(a) a real image
(b) a virtual image
(c) an image type which depends on object characteristics
(d) an image type which depends on lens curvature
Q2. The blue colour of sky is due to
(a) reflection of sunlight
(b) refraction of sunlight
(c) scattering of shorter wave lengths of sunlight in the atmosphere
(d) scattering of longer wave lengths of sunlight in the atmosphere
Q3. White clothes are cooler than black ones, because they
(a) absorb all the light that reaches them
(b) reflect all the light that reaches them
(c) will not allow the light to penetrate
(d) cool the sunlight completely
Q4. The head mirror used by ENT doctors is
(a) concave
(b) convex
(c) plane
(d) plano-convex
Q5. Magnifying glass is basically a
(a) plano-concave lens
(b) concave lens
(c) convex lens
(d) cylindrical lens
Q6. Which colour of light shows maximum deviation when passed through a prism?
(a) White
(b) Red
(c) Violet
(d) Green
Q7. Shaving mirror is
(a) convex
(b) concave
(c) plane
(d) parabolic
Q8. Which type of mirror is used in the head lights of vehicles?
(a) Plane mirror
(b) Concave mirror
(d) Parabolic mirror
Q9. A concave lens always forms an image which is
(a) red and erect
(b) virtual and erect
(c) real and inverted
(d) virtual and inverted
Q10. The scientist who first sent electromagnetic waves to distant places is
(a) James Clerk Maxwell
(b) Heinrich Hertz
(c) Thomas Alava Edison
(d) John Logie Baird
Q11. Which instrument is used to measure depth of ocean ?
(a) Fathometer
(b) Fluxmeter
(c) Endoscope
(d) Galvanometer
Q12. When a light wave is reflected from a mirror, there is a change in its
(a) frequency
(b) amplitude
(c) wavelength
(d) velocity
Q13. A man cannot see clearly beyond 10 m. The disease he suffers from
(a) far sight
(b) myopia
(c) cataract
(d) hypermetropia
Q14. The part of the eye having the largest refractive index is
(a) cornea
(b) aqueous humor
(c) lens
(d) vitreous humor
Q15. Spectacles used for viewing 3D films have
(a) bifocal lens
(b) convex lens
(c) concave lens
(d) polaroids
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