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

Light appears to travel in straight line because

Question # 2

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

Question # 3

The distance from eye to near point is taken as:

Question # 4

If the object is situated at focus of a convex lens, then its image is formed at:

Question # 5

Speed of light in vacuum depends upon:

Question # 6

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

Question # 7

A prism splits a beam of white light into seven component colors. This is so because

Question # 8

The cause of mirage observed in deserts in bright sunlight is due to

Question # 9

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

Question # 10

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 # 11

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

Question # 12

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

Question # 13

To see the minor details of the object by microscope, it should have:

Question # 14

Electromagnetic waves transport:

Question # 15

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

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ECAT Physics Chapter 9 Important MCQ's

Sr.# Question Answer
1 How is the image formed by a convex lens affected if the upper half of the lens is covered with a paper:
A. The upper half of the image is cut off
B. The brightness of the image is reduced
C. The brightness of the image is increased
D. No effect at all
2 Speed of light in vacuum depends upon:
A. Frequency
B. Wavelength
C. Amplitude
D. None of these
3 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
4 Monochromatic light means waves of:
A. Same frequency
B. Same colour
C. Same wavelength
D. All of them
5 A grating with high resolving power can distinguish _______ difference in wavelengths :
A. Smaller
B. Larger
C. Zero
D. None of these
6 In case of destructive interference of two waves, the amplitude of the resultant wave will be ____ either of the waves:
A. Greater than
B. Smaller than
C. Equal to
D. None of these
7 A convex lens acts as diverging lens when the object is placed:
A. Between F and 2F
B. At 2F
C. With focal length
D. Beyond 2F
8 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
9 In the formula R = N x m for diffraction grating, N denotes:
A. No. of lines/cm
B. No. of lines/meter
C. Total number of lines
D. None of above
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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