Question # 1

Ultraviolet region lies in ______ series

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Layman

Balmer

P fund

B racket

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

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

Photons must have energy equal to

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ev

En

hf

None 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

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

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

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VIBGYOR

ROYBGIV

ROYBIGV

BIGROYV

None of these

The value of the metastable state for Neon is

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20.66eV

20.61eV

19.23eV

18.70eV

Balmer series was identified in:

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1685

1785

1885

1985

1585

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

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1%

20%

30%

50%

70%

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

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Double

Half

One third

One fourth

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

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

The process of formation of spectrum is called:

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Interference

Spectroscopy

Dispersion

Reflection

Botha (A) 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

Selenium is:

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An insulator

A conductor

Both A and B

Excellent conductor

None of these

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