Question # 1

Si units of time period is

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second

hertz

revolution

vibration/sec

0.10 cm can be written as:

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1.0 x 10^-2m

1.0 x 10^-3cm

1.0 x 10^-4cm

1. x 10^-4m

In an A.C circuit with resistor only, the current and voltage have a phase angle of

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90°

0°

180°

none of these

Two conductors having the same type of charges are connected by a conducting wire. There would not be any amount of charges on them if

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They have the same potential

They have the same amount of charge

They have the same capacity

They have the same shape

When low energy photon interact with a metal,which of the following effect is likely to be taken place

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pair production

photoelectric

Compton effect

None of these

A heat engine is that which converts

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mechanical energy into thermal energy

thermal energy into mechanical energy

K.E into potential energy

heat energy into light energy

The direction of the streamlines is the same as the direction of the

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force

torque

velocity

weight

The capacitance of a parallel plate capacitor depends upon

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Area of the plates

Separation between the plates

Medium between the plates

All of the above

The current that flows through the coil of a motor causes:

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Its shaft to revolve

Its brushes to rotate

Motor to move

Its shafts to rotate

None of these

In magnet-coil experiment, emf can be produced by:

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Keeping the coil stationary and moving the magnet

Keeping the magnet stationary and moving the coil

Relative motion of the loop and magnet

Any one of above

All above

The waveform of alternating voltage is a:

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Square

Rectangular

Saw-tooth

Sinusoidal

None of these

At a given instant, a photon moves in +x direction in a region where there magnetic field in -z direction. The magnetic force on the proton will be the:

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-y direction

+y direction

+z direction

-z direction

None of these

The speed of sound in a medium depends on

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The elastic property but not on the inertia property

The inertia property but not on the elastic property

The elastic property as well as the inertia property

Neither the elastic property nor the inertia property

The time required for a radioactive material to decrease in active by one half is called

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half time

half life

disintegration time

mean life

The statement "the electric force of repulsion or attraction between two point charges is directly proportional to the product of the charges and inversely proportional to square of the distance between them" refer to

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Coulomb's law

Gauss's law

Biot-Sarwat law

Ampere's law

The earliest heat engine was

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petrol engine

diesel engine

electric engine

steam engine

The closed loop gain of the non-inverting amplifier is given by

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G = R₂/R₁

G = -R₂/R₁

G = 1 - R₂/R₁

G = 1 + T₂/R₁

The internal energy of a system does not depend upon the

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initial state of the system

final state of the system

path

none of them

Electromagnetic waves emitted by hot bodies are called:

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Photoelectrons

Alpha rays

Thermal radiation

None of these

The induced current is a conductor depends upon:

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Resistance of the loop

Speed with which the conductor moves

Any of these

Both (A) and (B)

None of these

The terminal velocity of a small size spherical body of radius R moving in a fluid varies as

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R

R²

1/R

(1/R)²

Alternating current can be transmitted:

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To long distance

At very high cost

At very low cost

Both (A) and (C)

Both (A) and (B)

Acceleration of a body is positive, if the velocity of the body is

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constant

increasing

decreasing

none of them

The unit of thermodynamical scale is

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centigrade

fahrenheit

kelvin

none of them

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

During the negative half-cycle of the half-wave rectification, the diode

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does not conduct

conducts

either of these

none of these

Rate of decay is actually described by.

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Half line

Decay constant

Mean life

Total life

None of these

A charge Q is divided into two parts q and Q - q and separated by a distance R. The force of repulsion between them will be maximum when

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q = Q/4

q = Q/2

q = !

None of these

The powers of tow electric bulbs are 100 W and 200 W. Both of them are joined with 220 V mains. The ratio of resistances of their filaments will be

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1 : 2

2 : 1

1 : 4

4 : 1

The heat required to raise the temperature of one mole of the substance through 1 K is called

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heat capacity

specific heat capacity

molar specific heat

all of them

With the propagation of a longitudinal wave through a material medium, the quantities transmitted in the propagation direction are

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Energy, momentum and mass

Energy

Energy and mass

Energy and linear momentum

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