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

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

Tick the series which lies in the visible region:

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Lyman series

Balmer series

Paschen series

Brackett series

P fund series

Spectrum represents the number of component colours present in certain light in terms of:

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Wavelength

Frequency

Energy

Both (A) and (B)

All 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

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 spectrum emitted from hydrogen filled discharge tube is:

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Line spectrum

Discrete spectrum

And spectrum

Absorption spectrum

Both (A) and (B)

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

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1%

20%

30%

50%

70%

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

Static electricity is produced by the transfer of:

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Electrons

Protons

One fluid

Two fluid

None of these

Laser is a beam of:

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Visible light

Infra red light

Ultra violet light

Violet light only

yellow light only

Photons must have energy equal to

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ev

En

hf

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)

Ultraviolet region lies in ______ series

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Layman

Balmer

P fund

B racket

The process of formation of spectrum is called:

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Interference

Spectroscopy

Dispersion

Reflection

Botha (A) and (D)

CT scanning is the abbreviated name of

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Computed Technology

Computed Technique

Computed Technology

Computerized Technique

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

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VIBGYOR

ROYBGIV

ROYBIGV

BIGROYV

None of these

Gaussian surface is always:

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Rectangular

Spherical

Cylinder

Box shape

Any of these

The electric field lines start from:

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Positive charge

Negative charge

Either A and B

Neutron

An atom

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 inkjet printer eject a thin stream of:

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Water

Oil

Ink

Any above

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

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 lie/s in. the infra-red region.

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Pfund series

Brackett series

Paschen series

All of these

None of these

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)

The minimum wavelength of X-rays produced of 1KV potential difference is applied across the anode and cathode of the tube is

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1.24 x 10^-10m

7.92 x 10^-20m

2.78 x 10^-14m

3.88 x 10^-11m

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

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