Question # 1

The current produced by moving a loop of a wire across a magnetic field is called:

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Direct current

Magnetic current

Alternating current

Induced current

None of these

Majority charge carriers in the p-region of p-n junction are:

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electrons

positrons

Holes

Neutrons

None of these

In compressional wave,the layer of medium having reduced pressure is called:

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Compression

Elasticity

Node

Rarefaction

The temperature at which the vibrations become so great that structure of the Crystal breaks up, is called:

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Critical temparature

Temperature of vaporization

Melting point

Both (A) and (C)

Both (A) and (B)

Which of the following is an example of a S.H.M?

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motion of a projectile

motion of a train along a circular path

motion of swing

electrons revolving sound the nucleus

One torr is equal to

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13.33 N/m²

760 N/m²

760 mm Hg

133.3 N/m²

An inertial frame is that frame in which

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a>0

a=0

a<0

none of these

An example of photoconductor is:

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Boron

Carbon

Iron

Aluminum

Selenium

During the nuclear changes, the law/s of conservation that hold/s are that of:

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Charge

energy

Momentum

Mass

All of these

Brownian motion increases due to

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Increase in size of Brownian particle

Increase in temperature of medium

Increase in density of medium

Increase in viscosity of medium

Instead of moving the coil towards a magnet, the magnet is moved towards the coil with the same speed. The galvanometer shows current:

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Of same magnitude in the same direction

Of different magnitude in the same direction

Of same magnitude but in opposite direction

Of different magnitude in the opposite direction

None of these

Xerography means:

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Dry writing

Wet writing

Poor writing

Excellent writing

Both (A) and (B)

An eV is unit of:

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Potential

Energy

Work

Power

Both (B) and(C)

The damping depends upon the

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amplitude

sharpness

both of them

none of them

The maximum displacement of a body on either side of its equilibrium position is called

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frequency

amplitude

displacement

time period

Which of the following is not a unit of power:

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J-sec

Watt

N m/sec

Horsepower

When a body is vibrating, the displacement from mean position:

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Increases with time

Decreases with time

Changes with time

None of these

The induced emf in a coil is proportional to:

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Magnetic flux through a coil

Rate of change of magnetic flux through the coil

Area of the coil

Product of magnetic flux and area of the coil

The energy is found from Einstein's mass energy relation is called

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binding energy of electron

binding energy of proton

binding energy of neutron

binding energy of nucleus

Under the elastic region, the deformation produced in the material, the deformation produced in the material will be

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permanent

temporary

either of them

none of them

An isochoric process is one which take place at

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Constant internal energy

Constant entropy

Constant volume

Constant pressure

An alpha particle is accelerated through a potential difference of 10⁶volt. Its kinetic energy will be

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1 MeV

2 MeV

4 MeV

8 MeV

The process in which energy is dissipated from the oscillating system is known as

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resonance

interference

diffraction

damping

When a dielectric material is introduced between the plates of a charged condenser the electric field between the plates

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Decreases

Increases

No change

May increase or decresase

A train cover 90 km in half an hour. the time taken by it to travel 15 km will be:

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20 minutes

48 minutes

10 minutes

5 minutes

A unit cell is smallest basic structure which is:

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One dimensional

Two dimensional

Three dimensional

Four dimensional

None of these

Solar cell converts sunlight directly into

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potential energy

thermal energy

mechanical energy

electrical energy

Work has the dimension as that of:

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Torque

Angular momentum

Linear momentum

Power

Which of the following is scalar quantity?

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Electric potential

Velocity

Momentum

Force

The wave form of alternating voltage is the graph between:

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Voltage across X-axis and time across y-axis

Current and time

Voltage along y-axis and time along x-axis

Voltage and current

Either (B) or (D)

The velocity of sound is greatest in

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Water

Air

Vacuum

Metal

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