Question # 1

If an electron is prijected in a magnetic field with velocity V, it will experience a force

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Photons emitted in inner shell transition are.

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Continuous X -rays

Discontinuous X rays

Characteristic X rays

Energetic X rays

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

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Energy

Mass

Wave length

Momentum

Very weak magnetic field produced by brain can be detected by

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MRI

CAT scans

Squid

CRO

In A.C circuit through a capacitor which one is:

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Current leads voltage by 90^∘

Current lags behind voltage by 90^∘

Both will be in phase

None of above

If the potential difference across two plates of capacitor is doubled, then energy stored in it will be.

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Two times

Eight times

Four times

Remain same

If an object moves with speed of light, its mass will be.

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Zero

Maximum

Minimum

infinity

The number of neutrons in Li are

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2

3

4

7

The sensitivity of galvanometer directly depends upon

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Magnetic field

Area of coil

Both a and b

None of a, b, c

In nuclear radiation , track of alpha particle is.

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Thin

Discontinuous

Erratic

Continuous

The electric field lines are closer where the field is

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Strong

Weak

Uniform

Variable

If the energy of photon is 10 eV and work function is 5 eV, then the a value of stopping potential will be

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50 V

2 V

5 V

15 V

The total charge of any nucleus is:

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Ze

Z

Both a and b

None of above

A light emitting diode emits light only when

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Reverse biased

Forward biased

Unbiased

None of these

The energy of photon is givne by

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mv2/2

hf

Va e

mac¹

Which is not true for X rays

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X rays are not defected by electric field

X rays are polarized

X rays consist of electromagnetic waves

X rays can be diffracted by grating

Einstein photoelectric equation is

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None of these

Drum of photocopier is made of.

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Copper

Aluminum

Nickel

Cobalt

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