Question # 1

In a transistor, collector current is controlled by

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Collector voltage

Base current

Collector resistance

All of the above

Most of the electrons in the base of an NPN transistor flow

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Out of the base lead

Into the collector

Into the emit

Into the base supply

Conventionally the angular velocity is directed at an angle of

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90° to the axis of rotation

30° to the axis of rotation

0° to the axis of rotation

None of the above

Which of the following is a characteristic of an ideal fluid?

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it is non-viscous

it is incompressible

it's motion is steady

all of the above

Whenever a covalent bond breaks, it creates:

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An electron

A hole

An electron-hole pair

A positron

All of these

The distance covered by the wave during one period is called its:

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Wave number

Frequency

Wavelength

Time period

A field in which the work done in moving a body along closed path is zero is called

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Nuclear Field

Conservative field

Gravitational field

Non-conservative field

Which of the following is most suitable as the core of transformer

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Soft iron

Alinco

Steel

None of these

In case of two identical charges placed certain distance apart, the electric field lines are:

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Straight lines

Sine curves

Curved

Both (A) and (B)

None of these

Total number of base units are

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Three

Five

Seven

Nine

The current sensitivity of the galvanometer is

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C/BAN

BAN/C

CAN/B

CBN/A

A motorist travels A to B at a speed at 40 km/h and returns at speed of 60 km/h.His average speed will be.

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40 km/h

48 km/h

50 km/h

60 km/h

Fast moving atomic particles, accelerated in an accelerator are applicable to the new branch of Physics is

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Newtonian mechanics

Relativistic mechanics

Classical mechanics

None of these

For glass-air boundary the critical angle θ_c is

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30^o

41.8^o

42.0^o

44.0^o

The relative velocity of a particle moving with velocity V with respect to itself is

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Zero

V

-V

None of these

A constant volume gas thermometer is more sensitive than liquid thermometer because

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Gas expand more than liquid

Gases are easily obtained

Gases are much lighter

Gases do not easily change their state

First law of thermodynamics tells us that heat energy can be converted into work which is

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Equivalent

Greater

Lower

None of these

When the speed of a moving body is doubled

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Its P.E. is doubled

Its acceleration is doubled

Its K.E. is doubled

Momentum is doubled

Surface tension of water is due to

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Inter molecular attractions

Intermolecular spaces

Inter molecular repulsion

None of above

SI unit of temperature

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Centigrade

Celsius

Kelvin

All of these

A pair of forces equal in magnitude and opposite in direction with non-coincident lines of action is known as

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A couple

A moment of force

A null vector

All of these

The function of compensator plate in interferometer is to

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Interfere properly

To equalize the distance of M₁ and M₂

Reflecting light properly

None of these

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