Question # 1

Potassium Cathodes in photocell emit electrons for a light.

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Visible

Infra red

Ultra violet

X rays

The radius of hydrogen atom is:

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0.53A°

0.053A°

0.53 x 10^-9

0.053 x10^-9

The potential barrier for silicon is.

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0.7 V

0.5 V

0.3 V

0.9 V

A battery is used in

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ohmmeter

Ammeter

Galvanometer

Voltemeter

If 10 A current passes through 100 mH inductor, then energy stored is.

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100 J

5 J

20 J

Zero

Mutual induction play role in.

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Generator

D.C. motor

Galvanometer

Transformer

The uncertainty principle was given by

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De-Broglie

Heisenberg

Einstein

Max Planck

EMF is induced due to change in

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Charge

Current

Magnetic flux

Electric field

Magnetic induction can be measured in units of.

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Tesla

Gauss

Weber/m2

All of the above

Commutator was invented in

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1834

1820

1840

1835

Heat generated by a 40 W bulb in one hour is.

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140 J

1440 J

14400 J

144000 J

The fraction change in resistance per Kelvin is known as:

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Temperature coefficient of Resistance

Coefficient of voltage of change

Thermal expansion

All of the above

The mutual inductance of the coils depends upon.

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Stiffness of the coils

Density of coils

Material of coils

Geometry of the coils

In RLC circuit the energy is dissipated in

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R only

R and L

R and C

L and C

Balmer Empirical formula explains the electromagnetic radiation of any excited atom in terms of their.

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Energy

Mass

Wave length

Momentum

By increasing the temperature of conductor, the flow rate of charges.

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Increase

Remains constant

Decreases

Changes exponentially

If current flowing through a solenoid becomes four times, then magnetic field inside becomes.

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two times

three times

four times

Half

The SI unit of E is NC-1 and that of B is Na-1 m-1 then the unit of E/B is.

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ms-2

ms

ms^-1

m-1s-1

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