Bihar Board - Class 12 Physics - Chapter 9: Ray Optics and Optical Instruments Multiple Choice Questions (MCQs)
Multiple Choice Question
1. The electromagnetic radiation belonging to the region of spectrum 400nm – 700nm is called as
(A) Microwave
(B) Infrared
(C) Light
(D) Gamma rays
Answer: (C) light
2. The speed of light in vacuum is given as
(A) 310-8 m/s
(B) 3108 km/s
(C) 3108 m/s
(D) None
Answer: (c) 3108 m/s
3. The bundle of rays of light constitute to form the
(A) Bundle of light
(B) Packets of light
(C) Both (A) and (B)
(D) Beam of light
Answer: (D) beam of light
4. The geometric center of the spherical mirror is called as
(A) Pole of the mirror
(B) Optical center
(C) Centre of curvature
(D) None
Answer: (A) pole of the mirror
5. The geometric center of spherical lens is called as
(A) Pole of the mirror
(B) Optical center
(C) Centre of curvature
(D) None
Answer:(B) optical center
6. In spherical mirror, the line joining pole and the center of curvature is called as
(A) Optical axis
(B) Principal axis
(C) Major axis
(D) None
Answer: (B) principal axis
7. In case of spherical lenses, the line joining optical center with its principal focus is called as
(A) Optical axis
(B) Principal axis
(C) Principal radius
(D) Radius of curvature
Answer: (B) principal axis
8. The distances measured in the same direction as the incident light are taken as
(A) Negative
(B) Positive
(C) Both (A) and (B)
(D) None
Answer: (B) positive
9. The distances measured in the direction opposite to the direction of incident light are taken as
(A) Positive
(B) Negative
(C) Both (A) and (B)
(B) None
Answer: (B) negative
10. The heights measured upward with respect to X axis and normal to the principal axis of mirror or lens are taken as
(A) Positive
(B) Negative
(C) Both (A) and (B)
(D) None
Answer: (A) positive
11. The heights measured downward with respect to X axis and normal to the principal axis of mirror or lens are taken as
(A) Positive
(B) Negative
(C) Both (A) and (B)
(D) None
Answer: (B) negative
12. In case of concave mirror, the reflected rays converge at a point on the principal axis which is called as
(A) Focus
(B) Principal focus
(C) Optical center
(D) Pole
Answer: (B) principal focus
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