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

00:00
Question # 1

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

Question # 2

When a source of light isat very large distance,the shape of wavefront is:

Question # 3

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

Question # 4

A virtual image is formed when object is placed:

Question # 5

The ratio of the diameter of two convex lenses is _____-the ratio of their focal lengths:

Question # 6

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

Question # 7

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

Question # 8

The locus of all the points in the same phase of vibration is called:

Question # 9

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

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

Light waves are:

Question # 12

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

Question # 13

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

Question # 14

The least distance of distinct vision is:

Question # 15

Laws of reflection and refraction can also be explained by:

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ECAT Physics Chapter 9 Important MCQ's

Sr.# Question Answer
1 Speed of light in vacuum depends upon:
A. Frequency
B. Wavelength
C. Amplitude
D. None of these
2 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
3 When the object lies between F and 2F, the image formed by is formed at:
A. Real
B. Virtual
C. Diminished
D. Erect
4 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
5 Huygen principle is used to determine:
A. Speed of light
B. Location of wavefront
C. About polarized or unpolarized light
D. None of them
6 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
7 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
8 The speed of the secondary wavelets as mentioned in Huygen's principle is _____ the speed of propagation of the wave itself.
A. Equal to
B. Greater than
C. Smaller than
D. None of these
9 When a source of light isat very large distance,the shape of wavefront is:
A. Spherical
B. Cylindrical
C. Plane
D. None of these
10 The distance from eye to near point is taken as:
A. 10 cm
B. 15 cm
C. 20 cm
D. 25 cm

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