Question # 1

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

Braking radiation causes:

Choose an answer

Continuous spectrum

Line Spectrum

Band spectrum

Discrete specturm

All of these

Gaussian surface is always:

Choose an answer

Rectangular

Spherical

Cylinder

Box shape

Any of these

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

We can excite an atom by

Choose an answer

Bombardment of particles

Radiating photons

Providing potential difference

All answer are true

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 formula of Brackett series can be obtained by putting in the general formula, the value of n equal to:

Choose an answer

one

two

three

four

five

The electric field lines start from:

Choose an answer

Positive charge

Negative charge

Either A and B

Neutron

An atom

The He-Ne laser discharge tube is filled with:

Choose an answer

85% He

15% He

50% He

60% He

85% Ne

Selenium is:

Choose an answer

An insulator

A conductor

Both A and B

Excellent conductor

None of these

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

Choose an answer

1%

20%

30%

50%

70%

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

In case of braking radiations, when the rate of deceleration is very large, the emitted radiation corresponds to:

Choose an answer

Short wavelength

Large wavelength

Very large wavelenth

Low frequency

Both (B) and (C)

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

The inkjet printer eject a thin stream of:

Choose an answer

Water

Oil

Ink

Any above

None of these

Static electricity is produced by the transfer of:

Choose an answer

Electrons

Protons

One fluid

Two fluid

None of these

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

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

Choose an answer

1.24 x 10^-10m

7.92 x 10^-20m

2.78 x 10^-14m

3.88 x 10^-11m

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

Choose an answer

Double

Half

One third

One fourth

Coulomb multiplied by volt by volt gives the unit called:

Choose an answer

farad

Ohm

Second

joule

Watt

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

The value of the metastable state for Neon is

Choose an answer

20.66eV

20.61eV

19.23eV

18.70eV

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