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

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 # 2

A virtual image is formed when object is placed:

Question # 3

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

Question # 4

A prism splits a beam of white light into seven component colors. This is so because

Question # 5

In order to get interference using two light rays

Question # 6

Which one of the following phenomenon cannot be explained on the bases of Huygen's theory

Question # 7

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

Question # 8

The magnifier forms a virtual image of the object at:

Question # 9

Resolving power in mth order diffraction for grating is given by:

Question # 10

Huygen's theory cannot explain

Question # 11

To observe interference of light, the condition, which must be met with is that the sources must be:

Question # 12

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

Question # 13

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

Question # 14

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 # 15

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

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ECAT Physics Chapter 9 Important MCQ's

Sr.# Question Answer
1 Light has:
A. Wave nature
B. Particle nature
C. Dual nature
D. None of these
2 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
3 Wave length of that color as compared to that of violet color is:
A. Smaller
B. Longer
C. Equal
D. None of these
4 Which one the following gives three regions of electromagnetic spectrum in order of increasing wavelength?
A. Gamma rays, micro waves, visible light
B. Radio waves, ultraviolet waves, X-rays
C. Ultraviolet rays, infrared rays, micro waves
D. Visible light, gamma rays, radio waves
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 Monochromatic light means waves of:
A. Same frequency
B. Same colour
C. Same wavelength
D. All of them
7 Stars twinkle due to
A. The fact that they do not emit light continuously
B. The refractive index of earth's atmosphere fluctuates
C. The Star's atmosphere absorbs its light intermittently
D. None of these
8 In order to get interference using two light rays
A. The sources should be monochromatic and coherent
B. The sources should have the same frequency
C. Superposition should be linear
D. All of these
9 A grating with high resolving power can distinguish _______ difference in wavelengths :
A. Larger
B. Zero
C. None of these
D. Smaller
10 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

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