Question # 1

The energy of the photon of wavelength 500 nm is.

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3.10 eV

2.49 eV

1.77 eV

1.52 eV

The effective value of any sinusoidal alternating current or voltage is

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None of the above

If V_rms be the root mean square value of emf then its peak to peak value is given by

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The potential difference between the top and bottom of a cloud chamber is of the order of

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290 v

400 v

1 kv

None of above

Compton shift is maximum for scattering angle of photon

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0^o

90^o

180^o

45^o

Closeness of the electric field lines is the measure of.

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Direction of field

Strength of field

Potential difference

Uniformity of field

The phase difference between current and voltage in an inductive circuit is.

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zero

90 ^o

180 ^o

45^o

Lenz's law was given by Heinrich lenz in:

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1894

1904

1854

1834

The potential difference across depletion region in case of Si is

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0.6 volt

0.9 volt

0.7 volt

0.2 volt

When a very high energy modeules such as y radiation interact with matter, the phenomenon arising will be.

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Photoelectric effect

Compton effect

Pair production

Annihilation of matter

What is difference is isotopes

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Number of protons

Number of neutrons

Number of electrons

Charge number

A moving charge is surrounded by:

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2 Fields

3 Fields

4 Fields

None of these

Which of the following quantities remain constant in step up transformer?

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Current

Voltage

Power

Heat

The electric potential at a mid point in an electric dipole is.

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0 V

0.5 V

1 V

1.5 V

If a charge is at rest in a magnetic field then force on charge is

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Zero

Double

One fourth

Four times

The symbol of p-n-p transistor is

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Which one of the following physical quantities change with relativistic speed?

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Length

Time

Mass

All of above

A simple device that prevents the direction of current from changing is called.

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Commutator

Rotor

Armature

Detector

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