Question # 1

Wattles current is said to flow when phase angle between virtual current and virtual voltage is

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0^o

90 ^o

180 ^o

270^o

Which of the following is a thermodynamic temperature scale.

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Celsius scale

Fahrenheit scale

Kelvin scale

Rankine scale

The perpendicular distance between the line of action of forces and the axis of rotation

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Torque

Moment arm

Moment of force

Momentum

The cathode ray oscilloscope is used

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For viewing the wave shape of rapidly changing electric current

As voltmeter

For measuring time intervals between electricalimpulses

All of the above

A force passing through the centre of gravity of a body

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Causes its translational motion

Causes its rotational motion

Holds the body in equilibrium

Produces both translational and rotational motion.

Mean free path in a gas is the

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Distance travelled by a molecule before hitting a wall

Average distance travelled by a molecule in one second

Average distance travelled between molecules between any two successive collisions

Root mean square velocity

A sound wave is an example of

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Transverse wave

longitudinal waves

Hair wave

Stationary wave

If work must be done by an outside agent attempting tobring two point charges close together.

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They are of opposite signs

The field is not conservative

The work is recoverable when they separate

The P.E. of the charges is reduced by the amount of the work done

The binding energy per nucleon for uranium is about.

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7.7 MeV

9.6 MeV

13.6 MeV

21.6 MeV

The electric bulb does not obey Ohm's law because.

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Current changes

Resistance changes

Heat is produced

All of these

Which quantity provides a quantitative measure of disorder.

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Entropy

Enthalpy

Randomness

Chaos

Huygen's principle is used to explain the

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Speed of light

Dispersion of light

Propagation of light

Reflection of light

The internal energy of an isolated system

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Is zero

Keeps on changing

Remains constant

Cannot be judged

In L-C parallel circuit the capacitor draws a

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Lagging current

Leading current

Lagging voltage

Leading voltage

When a wire moves perpendicularly to a magnetic field, the induced emf does ot depends upon

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The velocity of the wire

The resistance of the wire

The flux density of the magnetic

The orientation of the wire field

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

If the current in a wire which is placed perpendicular to a magnetic fields increases the force on the wire.

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Increases

Decreases

Remain the same

Will be zero

The process of getting energy by direct combusting method from the waste products is commonly known as.

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Solid waste

Depletion region

Green house

Fregmentation

When light emitting diode is forward biased, it emits light of the colour

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Red

Yellow

Green

All of these

When a body is taken out of the earth's gravitational field, the P.E. with respect to earth is

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Zero

Minimum

Maximum

geothermal

The electric heater takes a current of 4 A from a 250 V supply . How long would it take the heater to convert 400,000 J of electric energy.

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100 s

200 s

400 s

750 s

Inductance are measured in

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Coulombs

Volts

Henrys

Farads

The most suitable material for moderator in a nuclear reactor is.

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B

Cd

D2O

Uranium

Iron loss in a dynamo arises because of.

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The resistance of armature coil

The production of eddy current

The presence of mechanical friction

The leakage of flux

A spring of force constant k is out into three equal pats. The force constant of earth part will b e.

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k

3 k

k/3

k/2

On which factor cut off wavelength of X-rays coming from a Coolidge tube depends upon.

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Target material

Accelerating voltage

Filament temperature

Separation between target and the filament

Who proposed the thermodynamic scale of temperature.

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Saadi carnot

Lord Kelvin

Sir james dewar

Gabriei fahrenheit

In an accelerated or non - inertial frame of reference the weight of the body depends upon.

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Acceleration of the frame of reference

Velocity of the body

Momentum of the body

Velocity of the frame of reference

Polarization is characteristic of.

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Light wave

sound waves

Waver waves

x-rays

Which of the following quantities is not changed during refraction of light.

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Its direction

Its speed

Its frequency

Its wavelength

The half life of isotopes X is four days and its initial mass is 32 mg What mass of the isotope X will remain after twelve days.

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2 mg

4 mg

8 mg

18 mg

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