JEE PHYSICS UNIT 16
QUIZ NO 1
TOTAL QUESTIONS = 20
1. The speed of light is maximum in
A. vacuum
B. water
C. glass
D. diamond
2. The refractive index of a medium depends on
A. wavelength of light
B. frequency of light
C. both wavelength and frequency
D. neither wavelength nor frequency
3. Which phenomenon is responsible for the twinkling of stars?
A. refraction
B. diffraction
C. scattering
D. total internal reflection
4. The power of a lens is -2D. It means the lens is
A. concave with a focal length of 50 cm
B. convex with a focal length of 50 cm
C. concave with a focal length of -50 cm
D. convex with a focal length of -50 cm
5. In Young's double-slit experiment, the fringe width decreases if
A. distance between the slits is increased
B. wavelength of light is increased
C. distance between the slits and the screen is increased
D. wavelength of light is decreased
6. In a plane mirror, the image formed is
A. virtual, erect, and of the same size as the object
B. real, inverted, and smaller than the object
C. virtual, inverted, and of the same size as the object
D. real, erect, and larger than the object
7. Which of the following is a condition for total internal reflection?
A. Angle of incidence > critical angle
B. Angle of refraction > critical angle
C. Angle of incidence < critical angle
D. Angle of refraction < critical angle
8. The focal length of a convex lens is 20 cm. Its power is
A. 5D
B. 2D
C. 10D
D. 15D
9. The splitting of white light into its component colors is called
A. dispersion
B. diffraction
C. polarization
D. scattering
10. When light passes through a prism, it bends towards
A. the normal
B. the base of the prism
C. the apex of the prism
D. none of these
11. The magnification of a plane mirror is
A. 1
B. greater than 1
C. less than 1
D. infinite
12. The resolving power of a microscope increases with
A. decrease in wavelength
B. increase in wavelength
C. decrease in aperture
D. increase in aperture
13. A lens behaves as a converging lens in air and a diverging lens in water. The refractive index of the material of the lens is
A. equal to that of water
B. less than that of water
C. greater than that of water
D. equal to that of air
14. The critical angle for a medium is 45°. The refractive index of the medium is
A. 1.41
B. 1.5
C. 1.33
D. 2.0
15. Huygens' principle explains
A. reflection
B. refraction
C. both reflection and refraction
D. neither reflection nor refraction
16. In diffraction, the central maximum is
A. the brightest and widest
B. the dimmest and narrowest
C. the same brightness as other fringes
D. absent
17. The wavelength of light used in a double-slit experiment is doubled. The fringe width will
A. become half
B. remain unchanged
C. become double
D. become four times
18. The optical instrument that uses total internal reflection is
A. periscope
B. microscope
C. telescope
D. binocular
19. Which phenomenon of light does not support the wave nature of light?
A. photoelectric effect
B. interference
C. diffraction
D. polarization
20. The angle of deviation is minimum when light passes through a prism
A. symmetrically
B. asymmetrically
C. normally
D. at any angle
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