Question # 1

Unless stated otherwise, when we speak of A.C. meter reading, we usualy mean:

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Peak value

RMS value

Instantaneous value

Peak-to-peak value

Both (A) and (C0

The magnitude of alternative voltage V:

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Always increase

Always decrease

Remains constant

Does not remain constant

None of these

When a mass 'm' is pulled slowly, the spring stretches by an amount x_o, then the work done will be

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W=Kx_o

W=1/2Kx_o

W=1/2Kx²_o

W=4Kx_o

An L-R circuit has R = 10 Ω and L = 2 H. If 120 V, 60 Hz A.C. voltage is applied, then current in the circuit will be

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0.32 A

0.16 A

0.48 A

0.80 A

If the number of turns of a solenoid (carrying a steady current I) is doubled without changing the length of a solenoid, then magnetic field:

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Becomes Half

Becomes double

Is not affected

Becomes one fourth

None of these

The energy acquired by a mass of 1g moving with the speed of light is

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3 x 10⁸J

9 x 10¹³J

3 x 10¹³J

9 x 10¹⁶J

The force experienced by an electron projected in a magnetic field B with a velocity V is given by

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F=e(V x B)

F= -e(V x B)

F= e(B x V)

Both a and c

Centripetal force performs:

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Maximum work

Negative work

Positive work

None of these

The substance in which atoms are so oriented that the field produced by spin and orbital motion of the electrons might add up to zero,are called

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diamagnetic substances

ferromagnetic substances

paramagnetic substances

all of them

In an adiabatic process the work is done at the expense of the

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energy supplied to the system

energy gained from the surroundings

internal energy

none of them

The substances which break just after the elastic limit is reached, are known as

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brittle substances

ductile substances

plastic substances

elastic substances

The expression of energy stored in an inductor of length L and current I can be expressed by a relation

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1/2 LI²

1/2 I²L

1/2 I²L²

1/2 IL

If the tensile force is suddenly removed from a wire then its temperature will

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Decrease

Increase

Becomes zero

Remain constant

In case of reflection of ray within a denser medium, angle of incidnet is ______ -angle of reflection

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Greater then

Smaller then

Equal to

None of these

The practical use of services by optic fiber is

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Two way television

World processing

Image transmitting and receiving equipment

All of these

The materials in which there are plenty of free electrons for electrical conduction are known as

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conductors

insulators

semi-conductors

all of them

At constant temperature, if the volume of a given mass of a gas is doubled, then the density of gas becomes:

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Double

Remains constant

Half

None of these

The Earth rocks are in molten and partly molten state, usually within the Earth surface of

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5 km

10 km

15 km

18 km

The dimensions of ½at²are of

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length

Velocity

Acceleration

TIme

One radian is equal to

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360^o/π

58^o

57^o

57.3^o

Steel is preferred for making permanent magnets because it has

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Large retentivity and large coercively

Small retentively and small coercively

Large retentively and small soercively

Small retentively and large coactivity

A circuit that converts Pulsating DC into smooth DC contain :

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Filter

Capacitor

Inductor

LC circuit

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