Question # 1

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 quantity F x t is called as

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momentum

velocity

acceleration

impulse

When the waveform of one voltage is increasing and that of second is decreasing and vice versa, then phase difference between these voltage is

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90°

75°

0°

180°

Atoms of hydrogen gas can be excited by passing electric current through it when the gas is filled into the discharge tube at a pressure which is

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Less than atmospheric pressure

Much less than atmospheric pressure

Greater than atmospheric pressure

Much greater than atmospheric pressure

Both C and D

The density of water is 10³kg/m³. The water pressure on a submarine is 2.0 x 10⁷N/m². The depth of the submarine below the surface of the water, in maters, is approximately

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200 m

11000 m

2000 m

8000 m

Hold the solenoid in the right hand with fingers curling in the direction of current. The direction of the field will be given by:

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Thumb

Curled fingers

Middle finger

Arm of right hand

None of these

Calculate the amount of charge flowing in 2 minutes in a wire of resistance 10Ωwhen a potential difference of 20 V is applied between its ends

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120 C

240 C

20 C

4 C

If the distance of separation between two chares is increased, the electrical potential energy of the system will

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Increase

Decrease

May increase or decrease

Remain the same

Aerodynamics is a branch of:

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Hydrodynamics

Thermodynamics

Both of them

Statics

The temperature of gas is produced by

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At potential energy of its molecules

The kinetic energy of its molecules

The attractive force between its molecules

The repulsive force between its molecules

The nature of capacity of electrostatic capacitor depends on

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Shape

Size

Thickness of plates

Area

Electromagnetic waves transmit energy equal to

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1/2 mv²

m_oc²

hf/c

hf

In solids, only following type/s of wave can travel:

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Transverse

Longitudinal

Both A and B

None of them

Energy gas behaves like an ideal gast at

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High temperature and low pressure

Low temperature and high pressure

Both A and B

None

In gases, the charge carriers are:

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Electrons

Positive ions

Negative ions

Both A and C

Both A and B

When a body is pulled away from its rest or equilibrium position and then released, the body oscillates due to

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applied force

momentum

restoring force

none of them

The whole structure obtained by the repetition of unit cells is called:

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Crystal lattice

Amorphous solid

Polymeric solid

Polysterne

None of these

To display a digit of EIGHT, the number of ON LED'S are:

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Two

Three

Five

Seven

Eight

Work has a dimension as that of:

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Torque

Angular momentum

Linear momentum

Power

The consumption of energy by a 60 W bulb in 2 minutes is:

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2 watt-hour

120 watt-hour

30 watt-hour

None of these

41 The force experience, when proton projected in a magnetic field with velocity 'v' is

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+e(v x B)

-C(V x B)

+e²(v x B)

-e(v²x B)

The phase at the positive peak is

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Π/2

Π

3Π/2

2Π

If a liquid is heated in weightlessness, the heat is transmitted through

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Conduction

Convection

Radiation

Neither, because the liquid cannot be heated in weightlessness

When a high energy photon interact with a metal, which of the following effect is most likely to be taken place

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pair production

photoelectric effect

Compton effect

None of these

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

A (100 W , 200 W) bulb is connected to a 160 V power supply. The power consumption would be

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64 W

80 W

100 W

125 W

A ball is dropped from a certain height and another ball is projected horizontally from the same point. Which of the following statement is correct?

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Both hit the ground at the same veloctiy

Both hit the ground at the same speed

The change of velocity during the path for both balls is the same

The change of speed during the path for both balls is the same

Three resistors of resistance R each are combined in various ways. Which of the following cannot be obtained?

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3RΩ

2R/4Ω

R/3Ω

2R/3Ω

The charged nucleus of an atom itself spins its magnetic field

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equal to the field produced by orbital electrons

greater than the field produced by orbital electrons

much weaker than the field produced by orbital electrons

none of these

A body can have constant velocity when it follows:

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A circular path

A rectilinear path

Trajectory of a projectile

None of these

The smallest three dimensional basic structure in a crystalline solid is called

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lattice point

crystal lattice

cubic crystal

unit cell

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