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

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

Question # 2

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

Question # 3

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

Question # 4

In case of constructive interference of two waves, the amplitude of the resultant wave is _______ either of the waves:

Question # 5

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

Question # 6

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

Question # 7

The distance from eye to near point is taken as:

Question # 8

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

Question # 9

The magnifier forms a virtual image of the object at:

Question # 10

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

Question # 11

In case of point, source of light shape of wavefront is:

Question # 12

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

Question # 13

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

Question # 14

The wave nature of light was proposed by:

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 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:
A. 15 cm
B. 10 cm
C. 20 cm
D. 5 cm
2 Wave length of light, on the average, is given by:
A. 10-14m
B. 10-10m
C. 10-6m
D. 10-4m
3 Least distance of distinct vision of an old man possibly becomes:
A. A little less than 25 cm
B. A little more than 25 cm
C. Much less than 25 cm
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 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
6 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
7 Which one of the following can act approximately as a source of monochromatic light;
A. Neon lamp
B. Fluorescent tube
C. Sodium lamp
D. None of these
8 For the virtual image, option _______ is not correct:
A. 1/p = 1/f -1/q
B. 1/f = 1/p -1/q
C. 1/p=1/p-1/f
D. 1/p=1/f+1/q
9 The image of the tip of a needle is never sharp because of
A. Polarization of light
B. Interference of light
C. Diffraction of light
D. Reflection of light
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:
A. 5 cm
B. 10 cm
C. 20 cm
D. 25 cm

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