Question # 1

An compared to solid matter, a crack or an air bubble allows:

Choose an answer

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

Static electricity is produced by the transfer of:

Choose an answer

Electrons

Protons

One fluid

Two fluid

None of these

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

Choose an answer

Bohr

Rydberg

Planck

Rutherford

Coulomb

Tick the series which lie/s in. the infra-red region.

Choose an answer

Pfund series

Brackett series

Paschen series

All of these

None of these

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

Choose an answer

Nitrogen

Helium

Hydrogen

Neon

None of these

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

Choose an answer

Double

Half

One third

One fourth

The electric field lines start from:

Choose an answer

Positive charge

Negative charge

Either A and B

Neutron

An atom

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

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

Choose an answer

1%

20%

30%

50%

70%

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

CT scanning is the abbreviated name of

Choose an answer

Computed Technology

Computed Technique

Computed Technology

Computerized Technique

The transitions of electrons in the hydrogen atom result in the emission of spectral lies in the:

Choose an answer

Ultra red region

Visible region

Ultraviolet region

Any of these

None of these

The holes created in the L and M shells are occupied by transitions of:

Choose an answer

Electrons from lower states

Electrons from higher state

Positrons from higher states

Electrons from K shell

Both (A) and (B)

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

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)

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

Coulomb multiplied by volt by volt gives the unit called:

Choose an answer

farad

Ohm

Second

joule

Watt

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 spectrum emitted from hydrogen filled discharge tube is:

Choose an answer

Line spectrum

Discrete spectrum

And spectrum

Absorption spectrum

Both (A) and (B)

The results of spectra obtained by Blamer were expressed in 1896 by

Choose an answer

Bohr

Rydberg

Planck

Rutherford

Coulomb

Lyman series in the spectrum of hydrogen exists in the :

Choose an answer

Infra-red region

Visible region

Ultraviolet region

Both(A) and (B)

None of these

The photocopying process is called:

Choose an answer

Geography

Sonography

Xerography

Zerography

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