Question # 1

When brakes are applied to a fast moving car, the passengers will be thrown:

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Forward

Backward

Downward

None of these

Referring to above figure, current in coil P falls from its maximum value to zero:

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At the instant the switch is closed

At the instant the switch is opened

When switch is kept open

When switch is kept closed

None of these

In photoelectric effect the energy of ejected electrons depend on

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The frequency

The intensity

Both frequency and intensity

None of these

When the upward drag force of the fluid becomes equal to downward force of gravity of the droplet, then its velocity:

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Starts increasing

Starts decreasing

Becomes constant

Is called escape velocity

If we draw a graph between d (along x-axis) and F (along y-axis) and get a straight line horizontal to x-axis, then area under this straight line represents:

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Power

Work

Pressure

None of these

Amplitude is the displacement of the vibrating body from:

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One extreme position to the other extreme position

Mean position any one extreme position

Both A and B are correct

None of these

A swing has

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one natural frequency

two natural frequencies

three natural frequencies

four natural frequencies

The fractional change in resistance per kelvin is known as

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temperature coefficient

resistance coefficient

super temperature

critical temperature

The most common source of alternating voltage is:

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Motor

Transformer

AC genrator

Both (A) and (C)

Both (A) and (B)

Work is always done on a body when:

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A force acts on it

It moves through certain distance

None of A or B is correct

Both A and B is correct

A prism splits a beam of white light into seven component colors. This is so because

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Phase of different colors is different

Amplitude of different colors is different

Wavelength of different colors is different

Velocity of different colors is different

The bands below the valence band are

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completely filled and play active part in conduction process

completely filled and plays no part in conduction process

completely filled and play active part in conduction process

not completely filled and play no part in conduction process

Heat required to raise the temperature of one mole of a gas through 1 K at constant pressure is called

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heat capacity

specific heat capacity

specific heat at constant volume

specific heat at constant pressure

When the pn-junction is in reversed biased, current flows through the junction due to the

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majority carriers

minority carriers

either of them

none of them

Bodies which falls freely under gravity provides good example of motion under:

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Uniform acceleration

Non-uniform acceleration

Uniform velocity

None of these

The nature of radiations emitted by a hot body depends upon its:

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Metarial

Temperature

colour

Volume

Length

For addition and subtraction purposes, absolute uncertainties are:

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Added

Subtracted

Multipiled

Divided

One radian is:

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Greater than one degree

Less than one degree

Equal to one degree

None of them

By placing a dielectric in between the charges, the electrostatic force between them

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Is always reduced

Is always increased

Is not affected

Is increased one million times

None of these

A ten ohm electric heater operates on a 110 V line. Calculate the rate at which it develops heat in watts

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1310 W

670 W

810 W

1210 W

During the positive half-cycle in the half-wave rectification,the diode

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does not conduct

conducts

either of these

neither of these

The phase angle of a series RLC circuit at resonance is

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180°

90°

0°

None of the these

Boyle's law is applicable in

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Isochoric process

Isothermal process

Isobaric process

Isotonic process

The electric field lines start from

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Positive charge

Negative charge

Either A or B

Neutron

An atom

Mass of proton is of order of

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10^-31gm

10^-27kg

10^-24gm

10⁺²⁷kg

Which one is the least multiple

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Pico

Femto

Nano

Atto

The SI unit of flux density is.

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Tesla

Weber

Gaun

Weber/meter

Albert Einstein got the Nobel prize in physics for his explanation of photoelectric effect in

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1916

1919

1921

1923

In gases, the charge carriers are:

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Electrons

Positive ions

Negative ions

Both A and C

Both A and B

In the phenomenon of hysteresis

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magnetism leads the magnetising current

magnetism lags behind the magnetising current

meganetism goes along the magnetising current

none of them

Most practical application of electricity involve

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Charges at the rest

Charges in the motion

Electrons at rest

Atoms in motion

Molecules in motion

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