Question # 1

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

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1%

20%

30%

50%

70%

Ultraviolet region lies in ______ series

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Layman

Balmer

P fund

B racket

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)

Static electricity is produced by the transfer of:

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Electrons

Protons

One fluid

Two fluid

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

The first series which was identified in the spectrum of hydrogen is called:

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Lyman series

Balmer series

Paschen series

Brackett series

Pfund series

Coulomb multiplied by volt by volt gives the unit called:

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farad

Ohm

Second

joule

Watt

We can excite an atom by

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Bombardment of particles

Radiating photons

Providing potential difference

All answer are true

The photocopying process is called:

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Geography

Sonography

Xerography

Zerography

None 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

X-ray are also known as

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Roentgen rays

Maxwell rays

Plank range

Einstein rays

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 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

The process of formation of spectrum is called:

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Interference

Spectroscopy

Dispersion

Reflection

Botha (A) and (D)

Consider a photon of continuous X-ray and a photon of characteristics X-ray of same wavelength. Which of the following is/are different for the two photons

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Frequency

Penetrating power

Energy

Method of creation

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

The He-Ne laser discharge tube is filled with:

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85% He

15% He

50% He

60% He

85% Ne

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

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Nitrogen

Helium

Hydrogen

Neon

None of these

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)

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 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

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