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 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:

Question # 2

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

Question # 3

Light appears to travel in straight line because

Question # 4

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

Question # 5

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

Question # 6

Huygen principle is used to determine:

Question # 7

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

Question # 8

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

Question # 9

The property of light which does not change with the nature of the medium is:

Question # 10

The magnifier forms a virtual image of the object at:

Question # 11

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

Question # 12

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

Question # 13

Huygen's principles states that:

Question # 14

The velocity of light in vacuum can be changed by changing

Question # 15

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

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ECAT Physics Chapter 9 Important MCQ's

Sr.# Question Answer
1 Angle between the ray of light and the corresponding wavefront is:
A. 0°
B. 60°
C. 90°
D. 120°
2 A magnifier gives an image which is:
A. Virtual, inverted
B. Real, erect
C. Virtual, erect
D. Real, inverted
3 Huygen's principles states that:
A. Light has dual nature
B. Either of these
C. None of these
D. Light travels in straigth line
4 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
5 In case of point, source of light shape of wavefront is:
A. Spherical
B. Cylindrical
C. Plane
D. None of these
6 When the same object is viewed at a shorter distance, the image on the retina of the eye is _____ the so the object appears:
A. Greater, smaller
B. Smaller, smaller
C. Smaller, larger
D. Greater, larger
7 When the object lies between F and 2F, the image formed by is formed at:
A. Real
B. Virtual
C. Diminished
D. Erect
8 A grating with high resolving power can distinguish _______ difference in wavelengths :
A. Smaller
B. Larger
C. Zero
D. None of these
9 For the virtual image, option _______ is not correct:
A. 1/p = 1/f -1/q
B. 1/f = 1/p -1/q
C. 1/p=1/p-1/f
D. 1/p=1/f+1/q
10 Light waves are:
A. Transverse wave
B. Longitudinal wave
C. Compressional wave
D. None of them

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