ECAT Pre General Science Physics Chapter 9 MCQ Test With Answer

MCQ's Test For ECAT Pre General Science Physics Chapter 9 Physical Optics

Try The MCQ's Test For ECAT Pre General Science Physics Chapter 9 Physical Optics

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ECAT Pre General Science Physics Chapter 9 Physical Optics

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Question # 1

A ray passing through optical center of a lens, after refraction:

Question # 2

The magnifier forms a virtual image of the object at:

Question # 3

A grating with high resolving power can distinguish _______ difference in wavelengths :

Question # 4

The image of the tip of a needle is never sharp because of

Question # 5

Resolving power in mth order diffraction for grating is given by:

Question # 6

A convex lens acts as diverging lens when the object is placed:

Question # 7

The magnifier forms a virtual image of the object at:

Question # 8

In case of constructive interference of two waves, the amplitude of the resultant wave is _______ either of the waves:

Question # 9

To sources are said to be coherent if they have:

Question # 10

In order to get interference using two light rays

Question # 11

The property of light which does not change with the nature of the medium is:

Question # 12

Angle between the ray of light and the corresponding wavefront is:

Question # 13

The image of an object 5 mm length is only 1 cm high. The magnification produced by lens is:

Question # 14

If yellow light emitted by sodium lamp in Young's double slit experiment is replaced by blue light of the same intensity

Question # 15

In an interference pattern of Young's double slit(YDS) experiment:

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ECAT Physics Chapter 9 Important MCQ's

Sr.# Question Answer
1 A grating with high resolving power can distinguish _______ difference in wavelengths :
A. Larger
B. Zero
C. None of these
D. Smaller
2 When the object lies between F and 2F, the image formed by is formed at:
A. Real
B. Virtual
C. Diminished
D. Erect
3 A line which represents the direction of travel of a wave is known as:
A. Spherical Wavefront
B. Locus
C. Ray
D. Either B or C
4 Huygen principle is used to determine:
A. Speed of light
B. Location of wavefront
C. About polarized or unpolarized light
D. None of them
5 The contrast in the fringes in an interference pattern depends upon
A. Fringe width
B. Relative difference intensities of the two sources
C. Distance between the slits
D. Wavelength
6 A virtual image is formed when object is placed:
A. Within focal length of a convex lens
B. Near the focal point of a concave lens
C. Both A and B
D. Away from 2F of a convex lens
7 Angle between the ray of light and the corresponding wavefront is:
A. 0°
B. 60°
C. 90°
D. 120°
8 The distance from eye to near point is taken as:
A. 10 cm
B. 15 cm
C. 20 cm
D. 25 cm
9 A convex lens acts as diverging lens when the object is placed:
A. Beyond 2F
B. At 2F
C. With focal length
D. Between F and 2F
10 Conventionally, all the distance p, q, f are measured from _____ of the lens:
A. Focus
B. Optical center
C. Edges
D. None of these

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