Question # 1

Hard disk is made of:

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Aluminium

Copper

Iron

Plastic

CD which is made of soft material is called:

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Hard disk

Floppy disk

Iron disk

Copper disk

A data storage device is:

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Printer

Hard disk

Monitor

CPU

The refractive index of air is:

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6

7

2

1,0003

A normal eye can see near objects clearly at a distance of:

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20 cm

25 cm

30 cm

35 cm

A device which has two ways communication is:

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Television

Radio

Hard disk

Mobile phone

The distance between two consecutive waves compressions or rarefactions is called:

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Focal length

Wave length

Frequency

Time period

Astronauts in space need to communicate with each other by radio links because:

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Sound waves travel very slowly in space

Sound waves travel very fast in space

Sound waves cannot travel in space

Sound waves have low frequency in space

The line which passes through pole of the mirror and center of curvature is called principal:

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axis

Focus

Line

None of these

The S.I unit of power of a lens is:

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Dioptre

Volt

Ampere

Watt

The totally reflectiing prism one angle is of:

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45^o

90^o

180^o

120^o

Critical angle for diamond is:

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60^o

24^o

26^o

49^o

____________ is always virtual in case of convex mirror.

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p

image

object

all of these

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