Question # 1

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

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Double

Half

One third

One fourth

The range of wavelengths of colurs in the visible colours is

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140 nm to 456 nm

10 nm to 56 nm

410 nm to 656 nm

910 nm to 956 nm

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 formula of Brackett series can be obtained by putting in the general formula, the value of n equal to:

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one

two

three

four

five

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

The holes created in the L and M shells are occupied by transitions of:

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Electrons from lower states

Electrons from higher state

Positrons from higher states

Electrons from K shell

Both (A) and (B)

X-ray are also known as

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Roentgen rays

Maxwell rays

Plank range

Einstein rays

The photocopying process is called:

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Geography

Sonography

Xerography

Zerography

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 results of spectra obtained by Balmer were expressed in 1896 by:

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Bohr

Rydberg

Planck

Rutherford

Coulomb

The shell closer to the nucleus is called:

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N shell

L shell

K shell

M shell

O shell

A metastable stae:

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Is an excited state

Is that in which excited electron is stable

Is that in which excited electron is usually unstable

Means a time interval of 10^-8second

Both (A) and (C)

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

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1%

20%

30%

50%

70%

The life time of metastable state is equal to

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Life time of excited state

Greater than by excited state

Zero

Less than by excited state

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

Tick the series which lies in the visible region:

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Lyman series

Balmer series

Paschen series

Brackett series

P fund series

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

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

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

Tick the series which lie/s in. the infra-red region.

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Pfund series

Brackett series

Paschen series

All of these

None of these

The results of spectra obtained by Blamer were expressed in 1896 by

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Bohr

Rydberg

Planck

Rutherford

Coulomb

The process of formation of spectrum is called:

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Interference

Spectroscopy

Dispersion

Reflection

Botha (A) and (D)

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