Question # 1

The value of Stefan is constant is:

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4.57 x 10^-8 m²k²

5.67 x10^-8 wm^-2k^-4

6.67x 10^-11 wm²k⁴

7.45 x 10^-9 m² wk³

Power dissipation is a pure inductive or in a pure capacitance circuit is:

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10⁶

0

10^∘

Maximum

Electromagnetic induction obeys law of conservation

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Charge

Energy

Momentum

Mass

We can find from de Broglie formula

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Wavelength

Amplitude

Speed of wave

Frequency of wave

The torque in the coil can be increased by increasing:

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No. of turns

Current and magnetic field

Area of coil

All of the above

The minimum frequency needed to emit an electron form metal surface is called:

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Work function

Threshold frequency

Quanta frequency

All of above

Study of hydrogen visible spectrum in

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1886

1887

1895

1885

When the medium is insulator the elecrostatic force between the charges is

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Decreased

Zero

Increased

None of above

When platinum is heated is become dull red at:

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900°C

500°C

800°C

1100°C

One joule is equal to.

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1.6 x 10¹⁹ eV

1.6 x 10^-19 eV

6.25 x 10^-18 eV

6.25 x 10 ¹⁸ eV

An A.C. voltmeter reads 220 V, its peak value will be

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225 V

240 V

311.12 V

300 V

The radius of 10th orbit in hydrogen atom is.

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0.053 nm

0.53 nm

5.3 nm

53 nm

Two down and one up quarks make

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Proton

Neutron

~~photon~~

Positron

Which one is pentavalent impurity

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Boron

Gallium

Antimony

Indium

Two parallel wires carrying currents in the opposite direction.

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Repel each other

Attract each other

Have no effect upon each other

They cancel out their individual magnetic fields.

The application of mutual induction is a.

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D.C. motor

Radio

Television

Transformer

The SI unit of stress is same as that of.

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Pressure

Force

Momentum

Work

If a charged body is moved against the electric field it will gain.

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P.E.

K.E.

Mechanical energy

Electrical potential energy

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