ECAT Pre Engineering Physics Chapter 9 MCQ Test With Answer

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

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

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Physics ECAT Pre Engineering Chapter 9 Physical Optics

00:00
Question # 1

When a source of light isat very large distance,the shape of wavefront is:

Question # 2

Frequency of red color as compared to that of violet color is:

Question # 3

Light appears to travel in straight line because

Question # 4

The appearance of the colour in the soap (oil) film results from:

Question # 5

Conventionally, all the distance p, q, f are measured from _____ of the lens:

Question # 6

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

Question # 7

The contrast in the fringes in an interference pattern depends upon

Question # 8

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

Question # 9

The focal length of convex lens having magnifying power of 5.55 is:

Question # 10

The wave nature of light was proposed by:

Question # 11

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

Question # 12

Light has:

Question # 13

Wave length of light, on the average, is given by:

Question # 14

The locus of all points in a medium having same phase of vibration is called

Question # 15

Laws of reflection and refraction can also be explained by:

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ECAT Physics Chapter 9 Important MCQ's

Sr.# Question Answer
1 Resolving power in mth order diffraction for grating is given by:
A. R = N x m
B. None of these
C. R = m/N
D. R = N/m
2 When the same object is viewed at a shorter distance, the image on the retina of the eye is _____ the so the object appears:
A. Greater, smaller
B. Smaller, smaller
C. Smaller, larger
D. Greater, larger
3 Conventionally, all the distance p, q, f are measured from _____ of the lens:
A. Focus
B. Optical center
C. Edges
D. None of these
4 In an interference pattern of Young's double slit(YDS) experiment:
A. Bright fringesare wider than dark fringes
B. Dark fringes are wider than bright fringes
C. Both dark and bright fringes are of equal width
D.

Central fringes are wider than the outer fringes
5 A ray passing through optical center of a lens, after refraction:
A. Passes through focus
B. Go deviated
C. Retraces its path
D. Both B and C
6 According to Huygen's principle
A. light travels in straight line
B. Light is a transvers wave
C. Light has dual nature
D. All points on the primary wave-front are the sources of secondary wavelets
7 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
8 If the object and its image are located at a distance of 5 cm from the focus of a convex lens, the focus length of the lens will be:
A. 5 cm
B. 10 cm
C. 20 cm
D. 25 cm
9 If the object is placed at 12 cm distance from a convex lens of focal length 6 cm, then we get an image of ____ as that of object:
A. Double the size
B. Same size
C. Half the size
D. None of these
10 Wave length of that color as compared to that of violet color is:
A. Smaller
B. Longer
C. Equal
D. None of these

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