ABHYAS | Self Learning | Testing Platform

Q.1

The image of an object is formed at infinite distance from a concave mirror. The position of the object is ________

A.

At C

B.

Between C and F

C.

At F

D.

Between Pole and F

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Q.2

Which of the following is a unit of refractive Index?

A.

m/s

B.

degrees

C.

Watt

D.

Dimensionless

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Q.3

If angle of incidence of light while leaving denser object is zero, light would

A.

be reflected back

B.

go straight without any refraction

C.

be refracted

D.

end up at the boundary of the object

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Q.4

Refraction is the change in the direction of light due to change in ____________of light

A.

intensity

B.

frequency

C.

speed

D.

both (b) and (c)

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Q.5

A Match the entries given in Column - I with those in Column - II.

Column I	Column II
a. Plane mirror	1. Used as a magnifying glass
b. Convex mirror	2. Can form images of objects spread over a large area
c. Convex mirror	3. Used by dentists to see enlarged images of teeth
d. Concave mirror	4. Image is erect and of the same size as the object
e. Concave lens	5. The image is erect and smaller than the object

A.

a-4, b-2, c-1, d-3, e-5

B.

a-4, b-5, c-1, d-3, e-2

C.

a-4, b-3, c-2, d-5, e-1

D.

a-4, b-1, c-3, d-2, e-5

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Q.6

In a rectangular glass slab , if the incident angle is i and emergent angle is e, which of the following relations between i and e is true ?

A.

i>e

B.

i

C.

i=e

D.

i

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Q.7

Assertion : The air bubble shines in water.

Reason : Air bubble in water shines due to refraction of light.

A.

If both Assertion and Reason are correct and Reason is the Correct explanation of Assertion.

B.

If both Assertion and Reason are correct, but Reason not the Correct explanation of Assertion.

C.

If Assertion is correct but Reason in incorrect

D.

If Assertion is Incorrect but Reason in correct

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Q.8

An Object is placed at focus F of a concave mirror. The image will be formed ____________.

A.

At C

B.

Between C and F

C.

At infinity

D.

Beyond C

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Q.9

A light ray makes an angle of reflection 60, when it reflects from a plane reflecting sheet. The angle of deviation will be __________________

A.

40

B.

30

C.

45

D.

60

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Q.10

If the refractive index of benzene is 1.50, then speed of light in benzene is

A.

3/2 times that in vacuum

B.

equal to the speed of light in vacuum

C.

2/3 times that in vacuum

D.

4/3 time that in vacuum

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Attention !!!!!