Physics-Light (NSTSE (National Science Talent Search Exam- Unified Council) Class 10): Questions 1 - 7 of 48

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Question number: 1

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Question

The magnification and focal length of a converging lens are and , respectively. The object distance should be:

Choices

Choice (4) Response

a.

b.

c.

d.

Question number: 2

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Question

An image is formed on the centre of the curvature by convex lens, then the object is:

Choices

Choice (4) Response

a.

At focal point

b.

Far than centre of curvature

c.

At centre of the curved

d.

Between focal point and centre of the curvature

Question number: 3

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A convex lens is made by cutting a portion of a hollow glass sphere of radius . So, power of the lens is:

Choices

Choice (4) Response

a.

b.

c.

d.

Question number: 4

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Two thin lenses of power and are placed in contact. The power of the lens combination is:

Choices

Choice (4) Response

a.

2

b.

1.5

c.

1

d.

2.5

Question number: 5

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Question

Which of the following have maximum focal length?

Choices

Choice (4) Response

a.

Convex mirror

b.

Concave mirror

c.

Convex lens

d.

Plane mirror

Question number: 6

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Focal length of the convex lens is:

Choices

Choice (4) Response

a.

Always negative

b.

Sometime positive, sometime negative

c.

Always positive

d.

All of the above

Question number: 7

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Question

If power of a lens is , then radius of the curvature of the lens is:

Choices

Choice (4) Response

a.

b.

c.

d.

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