Question # 1

The thermionic current increases when

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Area of filament is decreased

Area of filament is increased

Temperature is decreased

Work function is increased

If a fluid does not wet a liquid surface, the angle of contact is.

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90^o

less than 90 ^o

* greater than 180 ^o

between 90^o and 180 ^o

A D.C Motor converts

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Mechanical energy into electrical energy

Mechanical energy into chemical energy

Electrical energy into mechanical energy

Electrical energy into chemical energy

What does a dynamo generate

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Electrons

Emf

anion

Cation

Stationary waves are produced when two identical waves are moving on the string.

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Along the same direction

Along the opposite direction

Along the perpendicular direction

Of length 1 m

A thin layer of oil the surface of water looks coloured due to.

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Pillarization of light

Different elements present in the oil

Interference of light

Transmission of light

In open circuit electromotive force equal to

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Current

Resistance

Voltage

Inductence

The capture of neutron by a proton results in the formation of.

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Deuteron and gama rays

Deuteron and alpha particle

Triton and Beta particles

Tritron and X rays

Internal energy of a gas decreased when

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It gains heat

Change in cycle

Change in adiatatic

Change in reversible

Which scientist coined the term quantum mechanics.

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Kari mark

Max Born

Erwin schrodinger

Issac Newton

The terminals of a battery are joined by a length of resistance wire Which change on its own will increase the current though the battery.

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Connecting the wire with plastic insulation

Covering the wire with plastic insulation

Using a shorter wire of the same material and the same thickness

Using a thinner wire of the same material and the same thickness

Which statement for geostationary orbit is false.

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A geostationary orbit must be directly above the equator

All satellites in a geostationary orbit must have the same mass

The period of a geostationary orbit must be 24 hours

There is only one possible radius for geostationary orbit

Dispersive power of a prism depends upon the wavelength of the light used and is

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More for large wavelengths

Less for large wavelengths

More for small wavelengths

Less for small wavelengths

A metallic rod is continuously heated at its two ends, The heat following through the rod does not depend upon.

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Mass of the upon

Area of cross section of the rod

Temperature gradient between two ends

Time for which heat flow through the rod

The magnitude of the instantaneous velocity is called the.

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_Displacement

Speed

Acceleration

Length

In which of the following eddy current is not used

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Induction furnace

Automobile speedometer

Electromagnetic damping

X- rays diffraction

What is the overall gain, if three amplifiers each with a gain of 30 are cacaded.

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30

90

270

27,000

Max. Planck was awarded Nobel prize in.

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1916

1918

1921

1923

Powder clings to the face due to

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Compression

Capillary action

Cohesion

Adhesion

The temperature scale based upon triple point of water was given by

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Rumford

Carnot

Kelvin

Celsius

A person of height 1.5 m stands 2.0 m in front of a plane mirror How far from the person is her image .

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2.0 m

3.0 m

3.5 m

4.0 m

A body of mass 2 kg attached to a spring is pulled to a distance of 4 cm What will be the value of spring constant K.

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490 N m-1

980 N m-1

1260 N m-1

1960- N m-1

Power of lens is measured in

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cm

Metres

cm-1

Dioptres

Two pure inductors each of self inductance L are connected in parallel The total inductance of the combination is.

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L

2L

L/2

L/4

The angle of scattering for which the Compton shift is maximum is.

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0^o

45 ^o

80 o

180^o

The half life of a radioactive substance is 6 years What is the time taken by 12 g of this substance to decay completely.

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12 years

24 years

48 years

infinity

Which equation in electromagnetism describe the magnetic field B generated by an electric current.

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ampere's circuital law

Bio savart law

Gauss's law for electromagnetism

Coulomb's law

The scientist who first noted that a compass needle was deflected when in the neighborhood of a current carrying wire was.

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Joseph Henry

Hans Christian Oersted

Michael Faraday

J.J. Thomson

The SI unit of density is.

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kg m2

kg m-2

kg m-3

kg m2 s-2

Photocells are used for

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Security systems

Counting systems

Automatic door system

All of the above

Which of the following is nearly monochromatic

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Light from sodium lamp

Light from candle

Light from gas lamp

Light from sun

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