Question # 1

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

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

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Nitrogen

Helium

Hydrogen

Neon

None of these

Graph of Black body radiation is example of

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Band spectra

Continuo's spectra

Line spectra

All

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

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 electric field lines start from:

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Positive charge

Negative charge

Either A and B

Neutron

An atom

Coulomb multiplied by volt by volt gives the unit called:

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farad

Ohm

Second

joule

Watt

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

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Bohr

Rydberg

Planck

Rutherford

Coulomb

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 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 inkjet printer eject a thin stream of:

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Water

Oil

Ink

Any above

None of these

Selenium is:

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An insulator

A conductor

Both A and B

Excellent conductor

None of these

X-rays produced in a tube operating at 10⁵V. The speed of X-rays produced is

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3 x 10⁸m/s

3.1 x 10⁸m/s

2.8 x 10⁸m/s

1.88 x 10⁸m/s

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

Gaussian surface is always:

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Rectangular

Spherical

Cylinder

Box shape

Any of these

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