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

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

Question # 2

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 # 3

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

Question # 4

Which one of the following can act approximately as a source of monochromatic light;

Question # 5

Monochromatic light means waves of:

Question # 6

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

Question # 7

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

Question # 8

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

Question # 9

The appearance of the colour in the soap (oil) film results from:

Question # 10

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

Question # 11

Laws of reflection and refraction can also be explained by:

Question # 12

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

Question # 13

Electromagnetic waves transport:

Question # 14

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

Question # 15

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

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ECAT Physics Chapter 9 Important MCQ's

Sr.# Question Answer
1 A convex lens acts as diverging lens when the object is placed:
A. Beyond 2F
B. At 2F
C. With focal length
D. Between F and 2F
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 Wave length of light, on the average, is given by:
A. 10-14m
B. 10-10m
C. 10-6m
D. 10-4m
4 The image of an object 5 mm length is only 1 cm high. The magnification produced by lens is:
A. 1
B. 0.2
C. 2
D. 0.1
5 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
6 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
7 The focal length of convex lens having magnifying power of 5.55 is:
A. 5.5 cm
B. 5 cm
C. 4.5 cm
D. 6 cm
8 Conventionally, all the distance p, q, f are measured from _____ of the lens:
A. Focus
B. Optical center
C. Edges
D. None of these
9 The locus of all points in a medium having same phase of vibration is called
A. Crest
B. Trough
C. Wavelength
D. Wave-front
10 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:
A. Double the size
B. Same size
C. Half the size
D. None of these

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