Question # 1

The SI unit of flux density is

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Newton/Amp-meter

Newton-m/Ampere

Newton-m/Amp²

Newton-Amp/meter

The inkjet printer ejects a thin stream of:

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Water

Oil

Ink

Any of above

None of these

Which of the following is not an example of intertial frame

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a body placed on the surface of earth

a body placed in a car moving with uniform velocity

a body placed in a car moving with same acceleration

none of these

Consider a spherical shell of metal at he centre of which a positive point charge is kept

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The electric filed is zero outside the shell

The electric field is zero everywhere

The electric field is zero in the region inside the shell

The electric field is non-zero in both regions outside and inside the shell

Ethanol (alcohol) is a type of:

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Electric fuel

Bio fuel

Nuclear fuel

None of these

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

If N is the total number of molecules and V is the volume of the container, then the expression for the pressure of gas is

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P=P/V<1/2mv²>

P=2N/V<1/2mv²>

P=2/3N/V<1/2mv²>

P=2/3N/V<mv²>

The path followed by the projectile is known as:

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Cycle

Hyperbola

Trajectory

Route

In reverse-biased p-n junction, the reverse current is due to flow of:

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Minority charge carriers

Majority charge carriers

Free electrons from p to n-region

Holes from n to p-region

all are true except (B)

The only significant motion possessed by the mono-atomic gas represented is:

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Translatory

Rotatory

Vibratory

None of these

Which one of the following physical quantities changes with relativistic speed

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Length

Mass

Time

All of the above

Max plank received the Nobel Prize in physics for his discovery of energy quanta in

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1900

1906

1912

1918

If we connected the ordinary DC ammeter to measure alternating current, it would measure its:

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Instantaneous value

RMS value

Value averaged over a cycle

Either (B) or (C)

Either (A) or (C)

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5μF

10μF

3μF

6μF

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

For the normal operation of the transistor, its

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emitter-base and collector base junctions are forward biased

emitter-base junction is reversed biased and collector base junction is forward biased

emitter-base junction is forward biased and collector-base junction is reverse biased

any one of these

The thermistors are usually made of

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Metals with low temperature coefficient of resistivity

Metals with high temperature coefficient of resistivity

Metal oxides with high temperature coefficient of resistivity

Semi conducting materials having low temperature coefficient of resistivity

When a mass 'm' is pulled slowly through a distance 'x_o' , the elastic potential energy of the spring would be

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P.E=Kx²_o

P.E= 1/2kx_o

P.E=1/2Kx²_o

P.E=Kx²_o

In case of an ideal gas, the P.E associated with its molecule is

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maximum

zero

minimum

not fixed

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

An electric charge at rest is

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Only an electric field

Only a magnetic field

Both electric and magnetic fields

None of the above

When two objects come to common temperature, the body is said to be in:

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Static equilibrium

Dynamic equilibrium

Thermal equilibrium

None of these

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)

A train of 150 m length is going towards north direction at a speed of 10 ms^-1. A parrot files at a speed of 5 ms^-1towards south direction parallel to the railway track. The time taken by the parrot to cross the train is equal to

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12 s

8 s

15 s

10 s

There is certain frequency below which no electrons are emitted from the metal surface, this frequency is known as

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maximum frequency

minimum frequency

threshold frequency

all of these

If the ends of a wire are connected to a battery an electric field E will be set up at:

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The ends of the wire only

Mid points of the wire only

Every point within the wire

At nodes only

Both (B) and (D)

A current of 1 ampere is passing through a conductor. The charge passing through it in half a minute s

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One coulomb

0.5 coulomb

30 coulombs

2 coulombs

None of these

In a semi-conductor material, the total current is

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only the +ve current

only the electronic current

sum of +ve and electronic current

all of them

Radioactivity was discovered by

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Rutherford

Henri Becqureal

Maxwell

James Chadwick

The rate of decay of a radioactive substance

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decrease exponentially with time

decreases linearly with time

increases linearly with time

increases exponentially with time

When a body is moving on a surface, the force of friction is called

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Static friction

Dynamic friction

Limiting friction

Rolling friction

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