Question # 1

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

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1%

20%

30%

50%

70%

Gaussian surface is always:

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Rectangular

Spherical

Cylinder

Box shape

Any of these

If the distance between two charges is doubled,the force between them will become:

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Double

Half

One third

One fourth

Balmer series lies in that region of electromagnetic wave spectrum which is called:

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Visible region

Invisible region

Infra-red region

ultraviolet region

None of these

Balmer series was identified in:

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1685

1785

1885

1985

1585

In case of braking radiations, when the rate of deceleration is very large, the emitted radiation corresponds to:

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Short wavelength

Large wavelength

Very large wavelenth

Low frequency

Both (B) and (C)

Laser is a beam of:

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Visible light

Infra red light

Ultra violet light

Violet light only

yellow light only

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

Tick the series which lies in the visible region:

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Lyman series

Balmer series

Paschen series

Brackett series

P fund series

The natural arrangement of colours in the spectrum of white light spectrum is

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VIBGYOR

ROYBGIV

ROYBIGV

BIGROYV

None of these

Static electricity is produced by the transfer of:

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Electrons

Protons

One fluid

Two fluid

None of these

The He-Ne laser discharge tube is filled with:

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85% He

15% He

50% He

60% He

85% Ne

The electric field lines start from:

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Positive charge

Negative charge

Either A and B

Neutron

An atom

The transitions of electrons in the hydrogen atom result in the emission of spectral lies in the:

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Ultra red region

Visible region

Ultraviolet region

Any of these

None of these

An compared to solid matter, a crack or an air bubble allows:

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Great amount of X-rays to pass

Smallast amount of X-rays to pass

Very samall amount of X-rays to pass

Any of these

None of these

Energy required by an electron revolving in certain orbit to jump to an excited state is called:

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Ionization energy

Ionization potential

Excitation energy

Excitation potential

None of these

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