Physics-Light (NTSE Stage-1 (State-Level) Scholastic-Aptitude & Language Comprehension): Questions 19 - 25 of 31

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Question number: 19

» Physics » Light

MCQ▾

Question

The number of lenses in a terrestrial telescope is

Choices

Choice (4) Response

a.

six

b.

four

c.

two

d.

three

Question number: 20

» Physics » Light

MCQ▾

Question

An object is placed 40 cm from a concave mirror of focal length 20 cm. The image formed is

Choices

Choice (4) Response

a.

virtual, erect and smaller in size

b.

real, inverted and smaller in size

c.

virtual, erect and larger in size

d.

real, inverted and same in size

Question number: 21

» Physics » Light

MCQ▾

Question

Critical angle of light passing from glass to water is minimum for

Choices

Choice (4) Response

a.

green colour

b.

Yellow colour

c.

violet colour

d.

red colour

Question number: 22

» Physics » Light

MCQ▾

Question

A concave mirror of focal length (in air) is immersed in water Ki (μ=43 ). The focal length of the mirror in water will be

Choices

Choice (4) Response

a.

34f

b.

43f

c.

73f

d.

f

Question number: 23

» Physics » Light

MCQ▾

Question

If the tube length of astronomical telescope is 105 cm and magnifying power is 20 for normal setting, find the focal length of the objective.

Choices

Choice (4) Response

a.

20 cm

b.

10 cm

c.

100 cm

d.

25 cm

Question number: 24

» Physics » Light

MCQ▾

Question

Which of the following is employed to clearly view objects, which cannot be seen directly due to obstruction?

Choices

Choice (4) Response

a.

Laser

b.

Periscope

c.

Kaleidoscope

d.

All of the above

Question number: 25

» Physics » Light

MCQ▾

Question

Two lenses are placed in contact with each other and the focal length of the combination is 80 cm. If the focal length of one is 20 cm, then the power of the other will be

Choices

Choice (4) Response

a.

-3.75D

b.

-1.0 D

c.

4.0 D

d.

1.66 D

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