Question # 1

An electrical source with internal resistance's' is said to operate a lamp of resistance R what fractions of the total power is delivered to the lamp.

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R+r/R

R-r/R

R/R+r

r/R-r

Object may acquire an excess or deficiency of charge by

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Rubbing them together

Grounding them

Applying coulomb's principle

Shielding them

The pressure of a goas is directly proportion to

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Mean velocity of the molecules

Mean square velocity of the molecules

Root mean square velocity of the molecules

Instantaneous velocity of the molecules

Radioactivity is the phenomenon associated with the.

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Transition of radiowaves

production of alpha particles only

Decay of nucleus

Reception of radio waves

Which thermometer is called sprint thermometer

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Alcohol thermometer

Mercury in glass thermometer

Gas thermometer

Radiation thermometer

The velocity of light was determined accurately by

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Newton

Huygen

Michelson

Young

In what form is the energy stored in an inductor.

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Magnetic

electrostatic

Magnetic and electrostatic

All of the above

Where should be the centre of gravity of a body.

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It must be within the body

It must be outside the body

It may be near but not essentially within the body

It changes its position after sometime

Sunlight can undergo total internal reflection if it enters from

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Glass to air

Air to glass

Air to water

Water to glass

Who discovered neutron in 1932.

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Chadwick

Bohr

Rutherford

Fermi

A concave mirror is used to form an image of the sun on a white screen IF the lower half of the mirror were covered with an opaque card the effect on the image on the screen would be.

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Negligible

To make the image less bright than before

To make the upper half of the image disappear

To make the lower half of the image disappear.

Photophone was invented by

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Graham bell

Galileo

Michelson

Faraday

On which of the following parameters the amount of charge that can be placed on a conductor does not depend on.

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Its capacitance

Its size or shape

its potential

Dielectric strength of the surrounding medium

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

MT-2 is the dimensionless formula of.

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Moment of iniertia

Viscosity

surface tension

Angular acceleration

The resistance of a coil changes directly with

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The current of A.C.

The frequency of A.C

The inductance

Both B and C

Which statement about the image formed by a convex lens is correct.

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It is always real and eruct

It is always real and inverted

It is always virtual and erect

It may be either virtual or real

The extension produced in a sample of material depends upon

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Nature of the material

Stretching force

Cross range order

All of the above

Radius of the Bother's orbit is r the radius of second orbit will be.

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2 r

3 r

4 r

8 r

What is the SI unit for thermal conductivity.

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W m-1 K-1

W m-2 k-2

W m-3 k-1

J kg -1 k-1

Current gain of a CE amplifier is 50, ITS hfe is about

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25

50

75

100

What is the value of earth's magnetics fields.

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5 G

50 G

100 G

500 G

Compton's effect was presented in.

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1921

1923

1931

1933

The materials whose resistivity becomes zero below a certain temperature.

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Semi conductors

Super conductors

Insulators

conductors

The current passing through the switch s will be

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Zero

3 A

4.5 A

10 A

Electricity is transmitted at high voltage rather than at low voltage because.

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It is generated at high voltage

It is safer

It requires less insulation

It wastes less energy

The dimensions of strain are.

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[MLT-2]

[ML-1T-2]

[ML-2T-3]

It is a dimensionless quantity

Which of the following type of force can do no work on the particle on which it operates.

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Gravitational force

Frictional force

Centripetal force

Elastic force

In a transistor which one is very thin.

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Collector

Emitter

Base

Depletion region

A diver leaving the diving board makes a somer sault in the air.

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This is due to gravitational force

The moment of inertia is decreased during the turn

His moment of inertia is increased

He pushes at the air for making the true

A single quantum of electromagnetic radiation is termed as.

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Compton

Photon

Hyperon

Meson

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