Question # 1

An emf is set up in a conductor when it:

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is kept in a magnetic field

is kept in a electric field

Move across a magnetic field

Both (A) and (B)

None of these

Two electric bulbs of 200 W and 100 W have same voltage. If R₁and R₂be their resistance respectively then

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R₁= 2R₂

R₂= 2R₁

R₂=4R₁

R₁= 4R₂

The direction of velocity is along the direction of

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distance

displacement

acceleration

all of them

Mass of proton is of order of

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10^-31gm

10^-27kg

10^-24gm

10⁺²⁷kg

The graph showing the variation of displacement with time is a

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Sine curve

Straight line

Parabola

None of these

The unit of flux density is also given by

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Weber/m²or Wb . m^-2

Weber/mor Wb . m

Weber/mor Wb . m^-1

Weber or Wb

The force acting on a charge moving in a magnetic field

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is perpendicular to the both magnetic field and direction of motion

is proportional to the magnetic of charges

vanishes when the motion is directly opposite to the direction of field

all of the above

A gas is compressed adiabatically till its temperature is double. The ratio of its final volume to initial volume will be

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1/2

More than 1/2

Less than 1/2

Between 1 and 2

The induced current in the loop can be Increased by

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Using a stronger magnetic field

Moving the loop faster

Replacing the loop by a coil of many turns

All above

Both A and B

Which one of the following is dimensionless:

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Acceleration

Velocity

Density

Angle

In the region surrounding a current carrying wire:

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A magnetic field is setup

The lines of force are elliptical

Direction of lines of forces depends upon direction of current

Both (A) and (C)

All of these

The fluid is incompressible, if itsdensity is

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zero

constant

very high

very small

Which one is the least multiple

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Pico

Femto

Nano

Atto

When the body is moves against the force of friction on a horizontal plane, the work done by the body is:

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Positive

Negative

Zero

None of these

In case of metallic conductors, the change carries are:

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Protons

Electrons

Antiprotons

Positrons

Both (A) and (B)

Which of the following forces is responsible for SHM

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Applied force

Restoring force

Fractional force

Elastic force

The mechanics, which deals with the objects moving with velocities approaching that of light is called

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Relativistic mechanics

Wave mechanics

Quantum mechanics

Statics

In n-p-n transistor, emitter base junction is kept

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reversed

forward biased

may be reversed or may be forward biased

none of these

Which one is the least multiple:

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Pico

Femto

Nano

Atto

Particles have the mass smallest of following is:

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Electron

Proton

Neutron

Quark

Which one of the following can act approximately as a source of monochromatic light;

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Neon lamp

Fluorescent tube

Sodium lamp

None of these

At low speeds, the drag force is

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proportional to speed

inversely proportional to speed

not simply proportional to speed

none of them

The motion of a projectile is

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one dimension

two dimension

three dimension

all of them

The frequency of free vibrations is known as

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free frequency

forced frequency

natural frequency

un-natural frequency

When platinum wire is heated, then at the temperature of 500 ^oC, it becomes:

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Yellow

Orange red

Dull red

White

Cherry red

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

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Direct current

Magnetic current

Alternating current

Induced current

None of these

Examples of moderators used in a fission reactor is/are:

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Water

Heavy water

Carbon

Hydrocarbon

All of these

1 J = ________?

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10⁷erges

10^-7erges

10⁵erges

10^-5erges

If a train traveling at 72 kmph is to be brought to rest in a distance of 200 meters then its retardation should be

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20 ms^-2

10 ms^-2

2 ms^-2

1 ms^-2

Which is modified form of galvanometer

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potentiometer

battery

voltmeter

slide wire bridge

The branch of physics which deals with the properties of fundamental particles is called:

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High energy physics

Molecular physics

Astrophysics

Space physics

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