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

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

Question # 2

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

Question # 3

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

Question # 4

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

Question # 5

In the formula R = N x m for diffraction grating, N denotes:

Question # 6

If the object is placed at 12 cm distance from a convex lens of focal length 6 cm, then we get an image of ____ as that of object:

Question # 7

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

Question # 8

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

Question # 9

To sources are said to be coherent if they have:

Question # 10

A line which represents the direction of travel of a wave is known as:

Question # 11

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

Question # 12

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

Question # 13

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

Question # 14

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

Question # 15

The magnifier forms a virtual image of the object 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. 5 cm
B. 20 cm
C. 10 cm
D. 15 cm
2 A ray passing through optical center of a lens, after refraction:
A. Passes through focus
B. Go deviated
C. Retraces its path
D. Both B and C
3 The terms phase difference and path difference are:
A. Same
B. Different
C. Equal
D. None of these
4 A grating with high resolving power can distinguish _______ difference in wavelengths :
A. Larger
B. Zero
C. None of these
D. Smaller
5 The cause of mirage observed in deserts in bright sunlight is due to
A. Refraction of light
B. Reflection of light
C. Scattering of light
D. Total internal reflection of light
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 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
8 Wave length of that color as compared to that of violet color is:
A. Smaller
B. Longer
C. Equal
D. None of these
9 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
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:
A. 6 x 10-5rad
B. 7 x 10-5rad
C. 8 x 10-5rad
D. None of these

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