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

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Question # 1

The ratio of the diameter of two convex lenses is _____-the ratio of their focal lengths:

Question # 2

In order to get interference using two light rays

Question # 3

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

Question # 4

Stars twinkle due to

Question # 5

The size of the image is maximum when its distance from the magnifying glass is:

Question # 6

When the same object is viewed at a shorter distance, the image on the retina of the eye is _____ the so the object appears:

Question # 7

The magnifier forms a virtual image of the object at:

Question # 8

The speed of the secondary wavelets as mentioned in Huygen's principle is _____ the speed of propagation of the wave itself.

Question # 9

The ratio of the size of the image to that of object is called:

Question # 10

The superposition of the two waves of same frequency and amplitude travelling in the same direction gives to an effect called

Question # 11

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

Question # 12

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

Question # 13

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:

Question # 14

Huygen's principles states that:

Question # 15

The terms phase difference and path difference are:

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ECAT Physics Chapter 9 Important MCQ's

Sr.# Question Answer
1 Wave length of that color as compared to that of violet color is:
A. Smaller
B. Longer
C. Equal
D. None of these
2 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
3 Which one of the following phenomenon cannot be explained on the bases of Huygen's theory
A. Refraction
B. Reflection
C. Diffraction
D. Formation of spectrum
4 A grating with high resolving power can distinguish _______ difference in wavelengths :
A. Larger
B. Zero
C. None of these
D. Smaller
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 If the object is situated at focus of a convex lens, then its image is formed at:
A. F
B. 2F
C. Infinity
D. None of these
7 The speed of the secondary wavelets as mentioned in Huygen's principle is _____ the speed of propagation of the wave itself.
A. Equal to
B. Greater than
C. Smaller than
D. None of these
8 To observe interference of light, the condition, which must be met with is that the sources must be:
A. Monochromatic
B. Phase coherent
C. Both of above
D. None of above
9 In order to get interference using two light rays
A. The sources should be monochromatic and coherent
B. The sources should have the same frequency
C. Superposition should be linear
D. All of these
10 To sources are said to be coherent if they have:
A. Same amplitude
B. Same wavelength
C. Definite phase relation with each other
D. None of them

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