Question # 1

Which of the following is not a unit of power:

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J-sec

Watt

N m/sec

Horsepower

Silicon is one of the mot commonly used:

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onductor

Dielectric

Insulator

Semiconduction

Both (B) and (C)

An object undergoes S.H.M has maximum speed when its displacement from the mean position is

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maximum

zero

half of the maximum value

one third of the maximum value

Computer chips are made from:

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Iron

Silicon

Helium

Stontium

Aluminium

The earth's potential is taken as

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Negative

Positive

Zero

Infinite

CRO deflects the beam of

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proton

a-particle

electron

neutron

The size of the image is maximum when its distance from the magnifying glass is:

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0.10 m

0.15 m

0.20 m

0.25 m

The number of vibrations in two seconds can be expressed as______if frequency of vibration is f.

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f

2 f

3 f

1/2 f

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 force which opposes the applied force producing the displacement in the spring is called

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restoring force

periodic force

centripetal force

resistive force

β-particles are easily deflected by collisions than heavy

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α-particles

β-particles

γ-particles

none of these

The energy of a photon in a beam of infrared radiation of wavelength 1240 nm is

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100 ev

10⁶e v

10³e v

1.0 e v

Fidelity refers to

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Reproduction of original sound

Reproduction of original image

Reproduction of music

Reproduction of a CD from original copy

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

The galvanometer can be made sensitive if the value of the factor C/BAN is

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constant

small

large

none of these

Rate of change of momentum is called

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Impulse

Force

Torque

Momentum

Certain charge +q is placed at the center of a sphere. At each of the sphere,The directions of electric intensity and vector area are:

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Same

Different

Opposite to each other

At 60º with each other

Both (B) and (C)

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

At ordinary temperature, an increase in temperature increases the conductivity of

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Conductor

Semiconductor

Insulator

Alloy

An induced current can be produced by:

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Constant magnetic field

Changing magnetic field

Varying magnetic field

Constant electric field

None of these

If one volt is needed to cause a current of one ampere to flow in a conductor, its resistance is

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one ohm

one joule

one volt

one ampere

An electric field is generated along the wire when:

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Its resistance is very high

A constant potential is maintained across the wire

Net current through the wire is zero

A constant potential difference is maintained across the wire

Either (A) or (D)

Which one of the following is an example of resonance

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swing

tuning a radio

microwave oven

all of them

In a charged capacitor the energy is stored in

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Both in positive and negative charges

Positive charges

The edges of the capacitor plates

The electric field between the plates

The power dissipation in a pure inductive or capacitance circuit is

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maximum

positive

zero

none

The conduction band in a solid

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may be empty

cannot be empty

should be filed

all of them

Which of the following four statements is false?

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A body can have zero velocity and still be accelerated

A body can have a constant velocity and still have a varying speed

A body can have a constant speed and still have a varying velocity

The direction of the velocity of a body can change when its acceleration is constant

The shortest distance between two points directed from its initial point to final point is called:

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Velocity

Displacement

Speed

Distance

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

The ability of the body to return to its original shape is called

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deformation

stretching

compressing

elasticity

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