ECAT Pre Computer Science Chapter 9 MCQ Test With Answer

MCQ's Test For ECAT Physics Chapter 9 Physical Optics

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

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ECAT Physics Chapter 9 Physical Optics

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Question # 1

According to Huygen's principle

Question # 2

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

Question # 3

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

Question # 4

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

Question # 5

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

Question # 6

The distance from eye to near point is taken as:

Question # 7

The velocity of light in vacuum can be changed by changing

Question # 8

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

Question # 9

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

Question # 10

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

Question # 11

The magnifier forms a virtual image of the object at:

Question # 12

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

Question # 13

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

Question # 14

Huygen's principles states that:

Question # 15

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:

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ECAT Physics Chapter 9 Important MCQ's

Sr.# Question Answer
1 The magnifier forms a virtual image of the object at:
A. None of these
B. Both A and B are correct
C. Much farther than the least distance
D. Least distance of distinct vision
2 Angle between the ray of light and the corresponding wavefront is:
A. 0°
B. 60°
C. 90°
D. 120°
3 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
4 The ratio of the diameter of two convex lenses is _____-the ratio of their focal lengths:
A. Greater than
B. Less than
C. Equal to
D. None of these
5 Monochromatic light means waves of:
A. Same frequency
B. Same colour
C. Same wavelength
D. All of them
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 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
8 The property of light which does not change with the nature of the medium is:
A. Frequency
B. Amplitude
C. Wavelength
D. None of these
9 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
10 A grating with high resolving power can distinguish _______ difference in wavelengths :
A. Smaller
B. Larger
C. Zero
D. None of these

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