NSTSE (National Science Talent Search Exam- Unified Council) Class 10: Questions 1020 - 1026 of 1484

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Question number: 1020

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Question

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: 1021

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Question

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: 1022

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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: 1023

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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: 1024

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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.

Question number: 1025

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Question

By which of the following mirror we can get long and thin image?

Choices

Choice (4) Response

a.

Cylindrical mirror

b.

Concave mirror

c.

Parabolic mirror

d.

Convex mirror

Question number: 1026

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Question

If an object is placed between focal point and centre of curvature of converging lens, then characteristics of its image will be:

Choices

Choice (4) Response

a.

Real, inverting, diminished

b.

Virtual, upright, diminished

c.

Virtual, upright, enlarged

d.

Real, inverting, enlarged

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