On line Test Physics-II Semester

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Dept. of Physics and Electronics, Shri Chhatrapati Shivaji College, Omerga organisd Online test for B. Sc. II Semester Physics Student on Paper NO. IV.

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1) The cardinal points of an optical system is *

1 point

A) two

B) four

C) six

D) eight

2)The nodal points are a pair of conjugate points on the axis having angular magnification is------ *

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A) unit positive

B) unit negative

C) Doubly positive

D) zero

3) When light is reflected from the surface of an optically denser medium then phase change is- *

1 point

A)90

B)180

C)270

D)120

4) In Ramsden eyepiece two plano-convex lenses of -- focal lengths are used. *

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A) equal

B) different

C)double

D)one-third

5) When light is reflected from surface of thin film, then the path difference for bright film is— *

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A)2µt cos r = nλ.

B) 2µt cos r = nλ/2

C) 2µt cos r = (2n+1)λ/2

D)µt cos r = nλ

6)In Newton’s ring experiment, the fringes produced are ---------- *

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A) Straight line

B) wedge-shaped

C)circular

D) localized

7)Michelson designed an interferometer to determine------------------ *

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A)the wavelength of light

B)thickness of thin strip

C)standardization of meter

D) All of these

8) Resolving power of grating is *

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A) 2n

B) nN

C) nN/2

D) 3nN/2

9) According to Huygen' explanation of double refraction in uniaxial crystal, the wave surface of ordinary ray is *

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A) spherical

B) ellipsoid

C) rectangular

D) triangular

10. Which of the following substances are optically active? *

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A) sugar crystal

B) turpentine

C) cinnabar

D) all of these

11. In Huygens eyepiece experiment, two lenses are used whose focal lengths are in the ratio----- *

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1:2

3:1

2:3

1:3

12. Ramsden eyepiece is also known as------

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Negative eyepiece

Positive eyepiece

Both Negative and positive eyepiece

Convex eyepiece

Clear selection

13 In Newton's ring experiment, center of circular fringes is----- *

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bright

less bright

dark

less dark

14. In Newton's rings experiment the diameter of the 15th ring wad found to be 0.40 cm and that of the 5th ring was 0.20 cm. If the radius of plano-convex lens is 100 cm, the wavelength of light used is

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5000 AU

3000 AU

4000AU

2500AU

Clear selection

15 In Michelson interferometer, if the mirrors M1 and M2 are perfectly perpendicular the fringes obtained are------ *

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Localized fringes

White light fringes

Circular fringes

Straight line fringes

16. In diffraction pattern due to thin wire, interference fringes are produced in ----- *

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Illuminated region

Geometrical shadow

above illuminated region

below illuminated region

17 In diffraction grating, (a+b) is called as---- *

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Width of slit

Width of opaque portion

Grating element

All of these

18 Resolving power of prism depends on---- *

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Length of base of brism

Refractive index

Wavelength of light

All of these

19. In Nicol prism Canada balsam acts as an ---- medium for the extra ordinary ray. *

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denser

rarer

opaque

It don't act as medium

20. Calculate the specific rotation if the plane of polarisation is turned through 26.4 deg, traversing 20 cm length of 20% sugar solution. *

1 point

26.4 deg

40 deg

33 deg

66 deg

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