Question # 1

Angular momentum of a body under a central force is

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Zero

Maximum

Minimum

Constant

Lagging of magnetic flux density behind the magnetizing fled is known as.

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susceptibity

Diamagnetism

Hysteresis

Retentivity

The electron behave an waves because

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They can be diffracted by a crystal

They can produce ions in gases

They can be deflected by magnetic field

They can be deflected by electric field

Molecules of a liquid

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Do not vibrate about their mean position

Are rigidly held with each other

Have weak attractive forces

Have strong attractive forces

Transistor stands for

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Transfer of resistance

Transfer of current

Transfer of power

Transfer of voltage

The instantaneous voltage across a pure inductance.

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Leads the current by 90 ^o in phase

Lags the current by 90 ^o in phase

Is in phase with the current

Leads the current by a phase angle which depends on the frequency

Electromotive force is closely related to.

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Inductance

Magnetic flux density

Potential difference

Electric field intensity

When the temperature of source and sink of a heat engine become equal the entropy change will be.

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Zero

Maximum

Minimum

Negative

The spectrum of radiation due to transitions between energy levels in an atom, other absorption or emission is called.

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Atomic spectrum

Molecular spectrum

Grating spectrum

Normal specturm

Image formed by a camera is

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Real, inverted, and diminished

Virtual, upright and diminished

Virtual, upright and magnified

Real, inverted and magnified

Inductance divided by resistance and the product of capacitance and resistance both have units of.

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Charge

Time

Force

Current

What is the value of earth's magnetics fields.

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5 G

50 G

100 G

500 G

The study of atomic structure of crystals by x rays was initiated by.

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Mosely

Young

Huygen

Bragg

The immediate cause of alternating currrent in the secondary coil of a transformer is

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A changing electric field

a changing magnetic field

The motion of primary coil

The iron core of the trnasformer

Which of the following is electromagnetic wave.

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X rays

Micro waves

Light

All of these

When 5 C of charge flows through a particular resistor 10 J of energy is converted What is the p.d. across the resistor.

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0.5 V

2.0 V

15 V

50 V

The total energy of the hydrogen atom is

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zero

Infinite

positive

Negative

A resistor whose resistance decreases with increasing intensity is.

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Light dependent resistor

Thermistor

Thermocouple

Strain gauge

Any frequency higher than the fundamental frequency of a sound is known as.

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Overtone

Beat

Acoustics

Shockwaves

A diode cn be used as

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Amplifier

Rectifier

Oscillator

Transistor

Which of the following is not essential for the free oscillations of a mass attached to a spring.

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Elasticity

Gravity

Inertia

Restoring force

If the resultant of all the forces acting on a body is zero then the body is in

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Translation equilibrium

Rotational equilibrium

Equilibrium

Dynamic equilibrium

A deuteron is

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A type of proton

A proton neutron bounded to gather.

A type of beta particle

A type of neutron

If pressure and temperature of an ideal gas is doubled and volume is halved, the number of the gas molecules.

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Become half

Remain constant

Become double

Become three times

No entropy change is associated with

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Isothermal process

Adiabatic process

Isochoric process

Isoteric process

Which of the following phenomenon is explained by the tunnel efffect.

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Alpha decay

Beta decay

Gama decay

Radioactivity

In an electronic transition atom cannot emit

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Gama rays

Visible rays

Infrared rays

Ultraviolet rays

The resultant magnitude of two vectors

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Is always positive

Can never be zero

Can be negative positive or zero

Is usually zero

The ratio of the magnitude of charge on one of the two conductors in proximity to the potential difference between the two is called.

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Inductance

Reactance

Resistance

Capacitance

The Pressure will be low where the speed of the fluid is

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Zero

High

Low

Constant

A man in an elevator ascending with an acceleration will feel that his weight.

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Has increased

Has decreased

Remains the same

Vanishes

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