Question # 1

The most common source of alternating voltage is:

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Motor

Transformer

AC genrator

Both (A) and (C)

Both (A) and (B)

Which of the following does not have the same units:

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Work

Heat

Kinetic energy

Power

If the distance between two charges is doubled, the force between them will become:

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Double

Half

Three times

One fourth

One third

In a straight current carrying conductor, the direction of magnetic field can be found by

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right hand rule

left hand rule

head to tall rule

none of these

If volume of wire is 'AL' and there are 'n' numbers of charge carriers per unit volume, then the total number of charge carriers are

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n/AL

Al/n

nAL

nA/L

To get a resultant displacement of 10 m, two displacement vectors of magnitude 6 m and 8 m should be combined

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Parallel

Antiparallel

At angle 60°

Perpendicular to each other

When a transistor is used as a switch the circuit in which the current is to be switched OFF and ON, is connected between the

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base and emitter

collector and emitter

base and collector

any one of these

A particle having the mass of electron and charge of a proton is called a

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photon

position

antiproton

antineutrino

The heat required to raise the temperature of one mole of the gas through 1 K at constant volume is called

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heat capacity

specific heat capacity

molar specific heat

molar specific heat at constant volume

If m means mass of gases objected per second from a rocket and v shows the change in velocity, than mv is named as:

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Force

Energy

work

impulse

Velocity of sound in vacuum (in m/s) is

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330

1000

156

0

When some compass needles are placed on a card board along a circle with the center at the wire, they will

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Point the direction of N-S

Set themselves tangential to the circle

Point in the direction of E-W

None of these

Point in direction of S-E

Sound waves in air always

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Longitudinal

Transverse

Stationary

Electromagnetic

The time rate of change of displacement is called:

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Time

Acceleration

Speed

Velocity

A projectile on its path gets divided into two pieces at its highest point. Which is true?

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Momentum increases

Momentum decreases

Kinetic energy increases

Kinetic energy decreases

In case of metallic conductors, the charge carriers are

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Protons

Electrons

Antiprotons

Positrons

Both A and B

A carnot cycle consists of

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One step

two step

three steps

four steps

The absolute temperature for an ideal gas is

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directly proportional to the rotational K.E of gas molecules

directly proportional to the vibrational K.E of gas molecules

directly proportional to the average translational K.E.of gas molecules

directly proportional to the P.E. of gas molecules

A car battery has e.m.f 12 volt and internal resistance 5 x 10^-2ohm. If it draws 60 ampere current, the terminal voltage of the battery will be

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5 volt

3 volt

15 volt

9 volt

The change of magnetic flux through a circuit will produce

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Magnetic Field

Electric Field

emf

a.c

When the charged particle is projected at right angles to the field, then experienced by it will be:

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Maximum

Zero

qvB

Both (A) and (B)

Both (A) and (C)

Which of these is not a radiation detector

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Wilson cloud chamber

cyclotron acceleration

Geiger Miller counter

solid state detector

At higher frequency of the alternating current, the capacitive reactance X_c

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Increases

Decreases

Remains the same

Increases only when the voltage increases

Magnetic effect of current is used:

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In electric motor

To detect current

To measure current

All of these

None of these

Transverse waves can be set up:

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Solids

Liquids

Gases

All of them

The value of current gain of n-p-n transistor is of the order of

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tens

hundreds

thousands

ten thousands

Improper biasing of a transistor circuit produces

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Heavy loading of emitter current

Distortion in the output signal

Excessive heat at collector terminal

Faulty location of load line

The effect of friction between different layers of a flowing fluid is described in terms of

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motion of fluid

nature of fluid

colour of fluid

viscosity of fluid

The unit of decay constant is

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sex

sec²

sec^-1

sec^-2

Resistance of a conductor is increased, the currant will

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Decrease

Increase

Remain the same

None of these

If the stress increased beyond the elastic limit of the material. the deformation produced in the material will be

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permanent

temporary

either of them

none of them

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