Question # 1

Graph of Black body radiation is example of

Choose an answer

Band spectra

Continuo's spectra

Line spectra

All

X-rays can penetrate in a solid matte through a distance of several:

Choose an answer

Kilo metres

Metres

Centimeters

A few angstroms

One micrometer

X-ray are also known as

Choose an answer

Roentgen rays

Maxwell rays

Plank range

Einstein rays

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

Choose an answer

3 x 10⁸m/s

3.1 x 10⁸m/s

2.8 x 10⁸m/s

1.88 x 10⁸m/s

The shell closer to the nucleus is called:

Choose an answer

N shell

L shell

K shell

M shell

O shell

The inkjet printer eject a thin stream of:

Choose an answer

Water

Oil

Ink

Any above

None of these

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

Choose an answer

Lyman series

Balmer series

Paschen series

Brackett series

Pfund series

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

Choose an answer

Frequency

Penetrating power

Energy

Method of creation

The range of wavelengths of colurs in the visible colours is

Choose an answer

140 nm to 456 nm

10 nm to 56 nm

410 nm to 656 nm

910 nm to 956 nm

None of these

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

Choose an answer

VIBGYOR

ROYBGIV

ROYBIGV

BIGROYV

None of these

Gaussian surface is always:

Choose an answer

Rectangular

Spherical

Cylinder

Box shape

Any of these

The value of the metastable state for Neon is

Choose an answer

20.66eV

20.61eV

19.23eV

18.70eV

The life time of metastable state is equal to

Choose an answer

Life time of excited state

Greater than by excited state

Zero

Less than by excited state

We can excite an atom by

Choose an answer

Bombardment of particles

Radiating photons

Providing potential difference

All answer are true

In helium Neon Laser Neon = 15% and Helium = 85% used. The lasing gas this unit is

Choose an answer

Helium

Neon

Both

None of these

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

Choose an answer

1%

20%

30%

50%

70%

The first shell near the neucles is

Choose an answer

L-shell

X-shell

N-shell

M-shell

Laser is a beam of:

Choose an answer

Visible light

Infra red light

Ultra violet light

Violet light only

yellow light only

An electron of the hydrogen atom in the second orbit is called its:

Choose an answer

Ground state

Excited state

Ionized state

Any of these

None of these

Braking radiation causes:

Choose an answer

Continuous spectrum

Line Spectrum

Band spectrum

Discrete specturm

All of these

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

Choose an answer

Less than atmospheric pressure

Much less than atmospheric pressure

Greater than atmospheric pressure

Much greater than atmospheric pressure

Both C and D

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

Choose an answer

Nitrogen

Helium

Hydrogen

Neon

None of these

Balmer series lies in that region of electromagnetic wave spectrum which is called:

Choose an answer

Visible region

Invisible region

Infra-red region

ultraviolet region

None of these

The spectrum emitted from hydrogen filled discharge tube is:

Choose an answer

Line spectrum

Discrete spectrum

And spectrum

Absorption spectrum

Both (A) and (B)

Energy required by an electron revolving in certain orbit to jump to an excited state is called:

Choose an answer

Ionization energy

Ionization potential

Excitation energy

Excitation potential

None of these

A metastable stae:

Choose an answer

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

Choose an answer

Bohr

Rydberg

Planck

Rutherford

Coulomb

In flesh, light element like carbon, hydrogen and oxygen predominate. Three elements allows ______ amount of incident X-ray to pass through them

Choose an answer

Small

Greater

Equal

Sometimes

The He-Ne laser discharge tube is filled with:

Choose an answer

85% He

15% He

50% He

60% He

85% Ne

Static electricity is produced by the transfer of:

Choose an answer

Electrons

Protons

One fluid

Two fluid

None of these

More Classes

Other Links

ECAT Pre General Science Physics Chapter 20 Atomic Spectra Online Test MCQs With Answers

Choose an answer

Choose an answer

Choose an answer

Choose an answer

Choose an answer

Choose an answer

Choose an answer

Choose an answer

Choose an answer

Choose an answer

Choose an answer

Choose an answer

Choose an answer

Choose an answer

Choose an answer

Choose an answer

Choose an answer

Choose an answer

Choose an answer

Choose an answer

Choose an answer

Choose an answer

Choose an answer

Choose an answer

Choose an answer

Choose an answer

Choose an answer

Choose an answer

Choose an answer

Choose an answer