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

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

Question # 2

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

Question # 3

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

Question # 4

A virtual image is formed when object is placed:

Question # 5

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

Question # 6

If yellow light emitted by sodium lamp in Young's double slit experiment is replaced by blue light of the same intensity

Question # 7

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

Question # 8

Least distance of distinct vision of an old man possibly becomes:

Question # 9

When the same object is viewed at a shorter distance, the image on the retina of the eye is _____ the so the object appears:

Question # 10

According to Huygen's principle

Question # 11

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

Question # 12

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

Question # 13

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:

Question # 14

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

Question # 15

Light appears to travel in straight line because

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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 With age, least distance of distinct vision:
A. Increases
B. Decreases
C. Is not affected
D. None is correct
3 A virtual image is formed when object is placed:
A. Within focal length of a convex lens
B. Near the focal point of a concave lens
C. Both A and B
D. Away from 2F of a convex lens
4 When a source of light isat very large distance,the shape of wavefront is:
A. Spherical
B. Cylindrical
C. Plane
D. None of these
5 Speed of light in vacuum depends upon:
A. Frequency
B. Wavelength
C. Amplitude
D. None of these
6 In case of point, source of light shape of wavefront is:
A. Spherical
B. Cylindrical
C. Plane
D. None of these
7 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
8 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
9 To see the minor details of the object by microscope, it should have:
A. High magnifying power
B. High resolving power
C. Am objective of larger focal length
D. None of these
10 Angle between the ray of light and the corresponding wavefront is:
A. 0°
B. 60°
C. 90°
D. 120°

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