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

Wave length of that color as compared to that of violet color is:

Question # 2

Huygen's theory cannot explain

Question # 3

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

Question # 4

When the object lies between F and 2F, the image formed by is formed at:

Question # 5

In order to get interference using two light rays

Question # 6

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

Question # 7

Light has:

Question # 8

A virtual image is formed when object is placed:

Question # 9

If the focal length of the convex lens is 5 cm, then to get the real and inverted image of the same size as that of object, the object should be placed at:

Question # 10

Certain light of wavelength 600 nm is used to view an object under the microscope. If the aperture of its objective is 1.22 cm, then the limiting angle of resolution will be:

Question # 11

Least distance of distinct vision of an old man possibly becomes:

Question # 12

Stars twinkle due to

Question # 13

In YDS experiment, fringe spacing means the distance between two consecutive ____fringes.

Question # 14

Which one the following gives three regions of electromagnetic spectrum in order of increasing wavelength?

Question # 15

Which one of the following can act approximately as a source of monochromatic light;

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ECAT Physics Chapter 9 Important MCQ's

Sr.# Question Answer
1 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
2 The superposition of the two waves of same frequency and amplitude travelling in the same direction gives to an effect called
A. Diffraction
B. Interference
C. Polarization
D. Dispersion
3 Light has:
A. Wave nature
B. Particle nature
C. Dual nature
D. None of these
4 The velocity of light in vacuum can be changed by changing
A. Frequency
B. Amplitude
C. Wavelength
D. None of these
5 A grating with high resolving power can distinguish _______ difference in wavelengths :
A. Smaller
B. Larger
C. Zero
D. None of these
6 In YDS experiment, fringe spacing means the distance between two consecutive ____fringes.
A. Bright
B. Dark
C. Any of A and B
D. None of these
7 A grating with high resolving power can distinguish _______ difference in wavelengths :
A. Larger
B. Zero
C. None of these
D. Smaller
8 Laws of reflection and refraction can also be explained by:
A. Particle nature of light
B. Quantum nature of light
C. Wave nature of light
D. Complex nature of light
9 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
10 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

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