Question # 1

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

Ultraviolet region lies in ______ series

Choose an answer

Layman

Balmer

P fund

B racket

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

Choose an answer

Bohr

Rydberg

Planck

Rutherford

Coulomb

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

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 photocopying process is called:

Choose an answer

Geography

Sonography

Xerography

Zerography

None of these

The He-Ne laser discharge tube is filled with:

Choose an answer

85% He

15% He

50% He

60% He

85% Ne

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

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

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

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

Choose an answer

Nitrogen

Helium

Hydrogen

Neon

None of these

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

Choose an answer

Wavelength

Frequency

Energy

Both (A) and (B)

All of these

Gaussian surface is always:

Choose an answer

Rectangular

Spherical

Cylinder

Box shape

Any of these

The shell closer to the nucleus is called:

Choose an answer

N shell

L shell

K shell

M shell

O shell

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 Blamer were expressed in 1896 by

Choose an answer

Bohr

Rydberg

Planck

Rutherford

Coulomb

Laser is a beam of:

Choose an answer

Visible light

Infra red light

Ultra violet light

Violet light only

yellow light only

Braking radiation causes:

Choose an answer

Continuous spectrum

Line Spectrum

Band spectrum

Discrete specturm

All of these

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

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

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

The value of the metastable state for Neon is

Choose an answer

20.66eV

20.61eV

19.23eV

18.70eV

More Classes

Other Links

Physics ECAT Pre Engineering Chapter 20 Atomic Spectra Physics 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