Question # 1

Internal energy of a gas decreased when

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It gains heat

Change in cycle

Change in adiatatic

Change in reversible

A simple pendulum suspended from the celling of a lift has a time period T when the lift falls freely the time period of the pendulum will become

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Zero

T/9.8

9.8 T

Infinity

How many terminals does a BJT have.

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1

2

3

4

Which of the following solids exhibits only short range order.

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Amorphous solids

Polymeric solids

Crystalline solids

All of the above

Which of the following is defined as the amount of heat required to raise the temperature of 1 g of water by 1 ^oC

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Joule

BTO

Electron volt

Calorie

Why transistor is preferred to triode valve for use as an amplifier.

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Because it can handle large power

Because it has higher input impedance

Because it has higher voltage gain

Because it has lower voltage gain

If in Young's double slit experiments the separation between two slits is halved then the fringe width

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Remains unchanged

Becomes double

Reduces to half

Becomes 3 times

The spacing of electric field lines between two identical point charges of opposite signs

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Is not indication of the field direction

Is not dependent on the magnitude of the charges

Is an indication of the field strength

Is large when the charges are very large

In a n-type material there is an excess of.

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Free electrons

Holes

Quarks

Measons

Which of the following is dimensionless.

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Strain

Stress

Pressure

Volume

When transvers wave travelling in a less dense medium is reflected at an interface will a more dense medium.

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A trough becomes a crest

There is no phase shift

There is phase shift of 360 ^o

A crest remains a crest

In rotational motion the quantity which plays the same role as the inertial mass in rectilinear motion.

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Angular momentum

Linear momentum

Moment of inertia

Torque

The process of pair production will take place if the energy of photon is greater than.

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0.21 MeV

0.51 MeV

1.51 MeV

1.21 MeV

When the number of turns in the solenoid is doubled without any change in teh length of the solenoid its self inductance will be.

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Halved

Doubled

4 times

8 times

MT-2 is the dimensionless formula of.

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Moment of iniertia

Viscosity

surface tension

Angular acceleration

A straight wire carrying current will experience a force when place in uniform magnetic field if

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The current and field are parallel

The current and field are at an angle

the current and field are parallel in opposite directions

All of the above

When net torque acting on a system is zero which of the following will be constant.

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Force

Angular momentum

Linear momentum

Linear impulse

X-rays are absorbed maximum by

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Paper

Copper

Steel

Lead

Why freezer a refrigerator is located in the top section

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Motor is not affected

Heat gained from environment is less

The entire chamber of freezer is cooled quickly

Heat gained from environment is more

The dimensions of strain are.

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[MLT-2]

[ML-1T-2]

[ML-2T-3]

It is a dimensionless quantity

The source of magnetic field are

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Isolated magnetic poles

Electric charge distributions

Current loops

Solenoids

The half life of a radioactive substance depend on.

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Pressure

Temperature

Amount of substance

No external influences

When we pass a radiation from a radioactive material through an electric field.

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All three kinds of rays will be deflected

Only the Gama rays are deflected

The Alpha and Beta particles are deflected

Only the alpha particles are deflected

The value of critical angle of glass is

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45^o

42^o

48^o

52^o

Which animal did Erwin Schrodinger contemplate using in his famous thought experiment.

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mouse

Cat

Dog

Rabbit

A semiconductor diode conducts only when it is

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Not biased

Zero biased

Reverse biased

Forward and biased

Convention is the transfer of thermal energy by means of currents in

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Pressure

Temperature

Liquids

Fluids

What is term for tendency of a system to oscillate with larger amplitude at some frequencies than at others.

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Resonance

Impedance

Inductance

Capacitance

The angular speed of an electron in the nth orbit of Bohr's hydrogen atom is.

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Directly proportional to n

Directly proportional to n2

Inversely proportional to n

Inversely proportional to n2

If an object moves with velocity of light the apparent length of the object moving the direction of motion becomes.

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Larger

Smaller

Zero

Infinity

The phenomenon of Compton's effect process that right has

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Wave nature

Particle nature

Dual nature

Corpuscular nature

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