Question # 1

Gaussian surface is always:

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Rectangular

Spherical

Cylinder

Box shape

Any of these

Ultraviolet region lies in ______ series

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Layman

Balmer

P fund

B racket

The lasing or active medium in He-Ne laser discharge tube is:

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Nitrogen

Helium

Hydrogen

Neon

None of these

By CAT scans, we can detect the density difference of the order of:

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1%

20%

30%

50%

70%

The electric field lines start from:

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Positive charge

Negative charge

Either A and B

Neutron

An atom

We can excite an atom by

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Bombardment of particles

Radiating photons

Providing potential difference

All answer are true

Photons must have energy equal to

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ev

En

hf

None of these

Static electricity is produced by the transfer of:

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Electrons

Protons

One fluid

Two fluid

None of these

Lyman series in the spectrum of hydrogen exists in the :

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Infra-red region

Visible region

Ultraviolet region

Both(A) and (B)

None of these

Atoms of hydrogen gas can be excited by passing electric current through it when the gas is filled into the discharge tube at a pressure which is

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Less than atmospheric pressure

Much less than atmospheric pressure

Greater than atmospheric pressure

Much greater than atmospheric pressure

Both C and D

Braking radiation causes:

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Continuous spectrum

Line Spectrum

Band spectrum

Discrete specturm

All of these

In helium Neon Laser Neon = 15% and Helium = 85% used. The lasing gas this unit is

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Helium

Neon

Both

None of these

X-rays can penetrate in a solid matte through a distance of several:

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Kilo metres

Metres

Centimeters

A few angstroms

One micrometer

The process of formation of spectrum is called:

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Interference

Spectroscopy

Dispersion

Reflection

Botha (A) and (D)

An electron of the hydrogen atom in the second orbit is called its:

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Ground state

Excited state

Ionized state

Any of these

None of these

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