Question # 1

Decibel is unit of

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Intensity of light

x-ray radiation capacity

sound loudness

Energy of radiation

If 2.2 kilowatt power is transmitted through a 10 ohm line at 22000 volt, the power loss in the form of heat will be

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0.1 watt

1 watt

10 watt

100 watt

When a position comes close to an electron they annihilate into photons such that

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each photon has energy 0.51 Me v

each photon has energy 1.02 Me v

each photon has energy 0.25 Me v

none of these

The amplifier which us used to perform mathematical operations electronically is known as

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calculator

OP-AMP

computer

any one of them

A tube is tapered from 20 cm diameter to 2 cm diameter, the velocity at the first cross-section is 50 cm/s, then the velocity at the second cross-section is

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50 m/s

20 m/s

40 cm/s

5 cm/s

A device used to measure the speed of liquid flow is known as

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barometer

speedometer

sphygmomanometer

venture-meter

The square of 0.4 is:

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Greater than 0.4

Smaller than 0.4

Equal to 0.4

None of them

The SI unit of flux density is

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Newton/Amp-meter

Newton-m/Ampere

Newton-m/Amp²

Newton-Amp/meter

A bar 1.0 m in length and located along x-axix moves with a speed of 0.75 c with respect to a stationary observer. The length of the bar as measured by the stationary observer is

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1.66 m

1.0 m

0.66 m

2.66 m

The critical temperature of mercury is

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1.18 K

4.2 K

3.72 K

7.2 K

The induced current in a conductor depends upon

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Resistance of the loop

Speed with which the conductor moves

Any of these

Both A and B

None of these

The fluid which is incompressible and non viscous is called

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Ideal fluid

Non-ideal fluid

Prefect fluid

All

A projectile on its path gets divided into two pieces at its highest point. Which is true?

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Momentum increases

Momentum decreases

Kinetic energy increases

Kinetic energy decreases

Lead, copper and wrought iron are examples of

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brittle substances

ductile substances

plastic substances

elastic substances

When the atomic particle are moving with velocities approaching that of light:

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Newton's laws become valid

Relativistic effects become prominent

Botha(A) and (B) are valid

Neither (A)nor (B)

There mass becomes zero.

When the total displacement is divided by total time taken, we get:

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Velocity

Average speed

Average velocity

None of these

Silicon is one of the mot commonly used:

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onductor

Dielectric

Insulator

Semiconduction

Both (B) and (C)

A force of 50 dynes is acted on a body of mass 5 g which is at rest, for an interval of 3 seconds, then impulse is

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0.15 x 10^-3Ns

0.98 x 10^-3Ns

1.5 x 10^-3Ns

2.5 x 10^-3Ns

If a system undergoes a natural process it will go in the direction that causes the entropy of the system plus the environment to increase, this is another statement of

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second law thermodynamics

first law of thermodynamics

third law of thermodynamics

none of them

For Protium, the mass defect is:

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Infinite

Zero

Very large

A few grams

None of these

If electric and gravitational force on an electron in a uniform electric field will be

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E=mg/q

E=q/mg

E=,g/q

E=qg/m

In which of the following components, pn-junction is used

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light emitting diode

photo diode

photo voltaic cell

all of these

Two point charges A and B separated by a distance R attract each other with a force of 12 x 10^-3N. The force between A and B when the charges on them are doubled and distance is halved

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1.92 N

19.2 N

12 N

0.192 N

The highest value reached by the voltage or current:

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In quarter cycle is called Instantaneous value

In half cycle is called peak-to-peak value

In one cycle is called peak value

In half cycle is called Instantaneous value

None of these

The first super conductor was discovered in

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1811

1890

1901

1911

When there is no internal frictional forces between the adjacent layers of fluid, then the fluid is called

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incompressible

compressible

viscous

non viscous

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 pressure of gas everywhere inside the vessel will be the same provided the gas is of

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Non-uniform density

uniform density

high density

low density

The passage of current is accompanied by a magnetic field in the surrounding space:

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Always accompanied

Sometimes accompanied

Never accompanied

Any of above

None of these

Which of the following does not obey ohm's law?

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Copper

Al

Diode

None

The artillery shells travel along parabolic paths under the influence of

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magnetic field

electric field

electromagnetic field

gravitational field

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