Optical Instruments MCQs
Multiple choice questions.
1.)The minimum distance from the eye at which an object appears to be distinct is called.
a) near point.
b) far point
c) minimum point.
d) maximum point
Ans : a) near point
2.) The ratio of the size of the image to the size of the object is called.
a) near point.
b) far point
c) magnifiacation
d) electrification
Ans : c) magnifiacation
3.) The ratio of the angles subtended by the image as seeb through the optical device to that subtended by the object at the unaided eye, this is known as
a) angular magnifiacation.
b) near point
c) resolving power.
d) electrification
Ans : a) angular magnifiacation
4.) The ability to reveal the mirror detaile of the object under examination, this is called as,
a) angular magnifiacation.
b) near point
c) resolving power.
d) electrification
Ans : c) resolving power
5.) Resolving power of an instrument can be expressed as, R = _______
a) N+m.
b) N-m
c) N×m.
d) N/m
Ans : c) N×m
6.) The magnifiacation of a convex lens can be expressed as, M = (d/f) + _______
a)1.
b) ½
c) 3/2.
d) 2
Ans : a) 1
7.) Magnifying power of the telescope = Focal length of the object / Focal length of the _______
a) lens.
b) principle axis
c) eyepiece.
d) two lenses
Ans : c) eyepiece
8.) Speed of light can be expressed as, c = _______
a) 8fd.
b) 16fd
c) 2fd.
d) 2πfd
Ans : b) 16fd
9.) The index of refraction can be expressed as, n = ________
a) c+v.
b) c-v
c) c×v. d) c/v
Ans : d) c/v
10.) Least distance of distinct vision is the ______ distance from the eye at which an object appears to be distant.
a) maximum.
b) minimum
c) equal.
d) zero
Ans : b) minimum
11.) Which lens is used for simple microscope
a) concave.
b) convex
c) simple.
d) non of these
Ans : b) convex
12.) The magnifying power of simple microscope can be expressed as, M = 1 + ______
a) df.
b) d²f
c) df².
d) d/f
Ans : d) d/f
13.) The magnifying power of compound microscope can be expressed as, M = [1+(d/f)]______
a) q/p.
b) p/q
c) q²/p.
d) q²/p²
Ans : a) q/p
14.) Compound microscope consists of ______ convex lenses.
a) one.
b) two
c) three.
d) five
Ans : b) two
15.) An optical device which is used to steady spectra from different sources of light called.
a) Opticalmeter.
b) Spectrometer
c) Sourcemeter.
d) Lightmeter
Ans : b) Spectrometer
16.) The ratio of speed of light in vacuum to the speed of light in the material is called.
a) Index of refraction
b) Index of reflection
c) Index of magnifiacation
d) Index of electrification
Ans : a) Index of refraction
17.) The angle incident in the denser medium for which the angle of refraction in the rarer medium is equal to 90° is called.
a) incident angle.
b) reflected angle
c) refracted angle.
d) Critical angle
Ans : d) Critical angle
18.) When the angle of incidence become greater than the critical angle of that material the incident ray is reflected in the some material, which is called.
a) Total internal reflection
b) Total internal refraction
c) Total internal incidence
d) Total internal critical angle
Ans : a) Total internal reflection
19.) A layer of refractive index over the central core of high refractive index is called ________
a) critical angle.
b) cladding
c) refractive angle.
d) reflective angle
Ans : b) cladding
20.) Critical angle is the angle of incidence in the denser medium for which the angle of refraction in the rarer medium is equal to _________
a) 90°.
b)180°
c) 270°.
d) 360°
Ans : a) 90°