Question # 1

the final image obtained by astronomical telescope is.

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Erect

Virtual

Magnified

All of these

A convex lens can be used as

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Simple microscope

Compound microscope

Telescope

Spectrometer

If an object is placed with in the focal length of a convex lens, its image is formed.

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Real

Inverted

Virtual

Smaller than object

If focal length of objective and eye piece is 0.5 m and 10 cm respectively then magnifying power of telescope will be.

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0.5

5

10

20

The Detector in Photo phone is made up of.

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Cadmium

Germanium

Selenium

Silicon

Image formed by a concave lens is

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Real

Virtual

Erect

None of these

A double convex lens acts as diverging lens when the object is

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At infinity

Inside the focus

A way from focus

A a large distance from lens

Multimode graded index fibre has a core whose diameter range lie from.

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5 to 50 micro meter

50 to 100 micro meter

40 to 1000 micro meter

50 to 10,000 micrometer

The magnifying power of an astronomical telescope is 10. If the focal length of objective is 100 cm, then what is the focal length of eye piece.

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10 cm

100 cm

1000 cm

5 cm

Multimode step index fibre is useful for

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Long distances

Short distances

Better quality

Low price

The magnifying power is also called

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Resolving power

Angular magnification

Strength of eye

None of these

The diameter of a lens is called

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Focal length

Aperture

Principle axis

Centre

More details of an object can be seen with a microscope by using

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Green light

Red light

Yellow light

Blue light

Critical angle is that angle of incident ofr which angle of refraction is.

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90 ^o

45 ^o

42 ^o

24 ^o

The ratio of size of image and size of object is

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Focal length

Magnification

Resolving power

Principle focus

The light emitted from light emitting diode has wave length.

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1.1 micro meter

1.3 micro meter

1.5 micro meter

1.7 micro meter

If the object is at 5 cm from the lens of simple microscope than its magnifying power will be.

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5

10

15

25

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Physics Fsc Part 1 Chapter 10 Online Test MCQs With Answers

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