Question # 1

The ratio of size of image and size of object is

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Focal length

Magnification

Resolving power

Principle focus

A convex lens acts as diverging lens if the object is placed at

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F

2F

Between F and 2 F

Within the F

Image formed by a concave lens is

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Real

Virtual

Erect

None of these

The focal length of convex lens

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Negative

Positive

small

Large

The diameter of a lens is called

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Focal length

Aperture

Principle axis

Centre

Using a graded Index fibre, the time difference is reduced to about.

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1 ns per km

33 ns per 100 km

33 ns per km

1 ns per 100 km

The focal length of a concave lens is always

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+ve

-ve

Zero

None of these

The optical fibre is covered for protection by

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Glass jacket

Plastic jacket

Steel jacket

Diamond jacket

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

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

A convex lens can be used as

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Simple microscope

Compound microscope

Telescope

Spectrometer

the final image obtained by astronomical telescope is.

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Erect

Virtual

Magnified

All of these

In an object is placed in between focus point and Opticla center of a convex lens, the image formed by lens is.

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Real inverted

Virtual diminshed

Virtual inverted

Virtual erected

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

A layer over the central core of the jacke is called.

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Jacket

Plastic

Cladding

Rubber

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

The least distance of distinct vision for the normal eye is.

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15 cm

25 cm

125 cm

25 m

The Detector in Photo phone is made up of.

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Cadmium

Germanium

Selenium

Silicon

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Physics Fsc Part 1 Chapter 10 Online Test MCQs With Answers

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