ECAT Pre Computer Science Chapter 20 MCQ Test With Answer

MCQ's Test For ECAT Physics Chapter 20 Atomic Spectra

Try The MCQ's Test For ECAT Physics Chapter 20 Atomic Spectra

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ECAT Physics Chapter 20 Atomic Spectra

00:00
Question # 1

The value of the metastable state for Neon is

Question # 2

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

Question # 3

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

Question # 4

The life time of metastable state is equal to

Question # 5

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

Question # 6

Coulomb multiplied by volt by volt gives the unit called:

Question # 7

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

Question # 8

The range of wavelengths of colurs in the visible colours is

Question # 9

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

Question # 10

Lyman series in the spectrum of hydrogen exists in the :

Question # 11

The photocopying process is called:

Question # 12

The He-Ne laser discharge tube is filled with:

Question # 13

Braking radiation causes:

Question # 14

A metastable stae:

Question # 15

Photons must have energy equal to

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ECAT Physics Chapter 20 Important MCQ's

Sr.# Question Answer
1 Static electricity is produced by the transfer of:
A. Electrons
B. Protons
C. One fluid
D. Two fluid
2 In flesh, light element like carbon, hydrogen and oxygen predominate. Three elements allows ______ amount of incident X-ray to pass through them
A. Small
B. Greater
C. Equal
D. Sometimes
3 The value of the metastable state for Neon is
A. 20.66eV
B. 20.61eV
C. 19.23eV
D. 18.70eV
4 The He-Ne laser discharge tube is filled with:
A. 85% He
B. 15% He
C. 50% He
D. 60% He
5 Balmer series was identified in:
A. 1685
B. 1785
C. 1885
D. 1985
6 Gaussian surface is always:
A. Rectangular
B. Spherical
C. Cylinder
D. Box shape
7 An electron of the hydrogen atom in the second orbit is called its:
A. Ground state
B. Excited state
C. Ionized state
D. Any of these
8 Tick the series which lie/s in. the infra-red region.
A. Pfund series
B. Brackett series
C. Paschen series
D. All of these
9 Coulomb multiplied by volt by volt gives the unit called:
A. farad
B. Ohm
C. Second
D. joule
10 X-rays can penetrate in a solid matte through a distance of several:
A. Kilo metres
B. Metres
C. Centimeters
D. A few angstroms

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