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

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Question # 1

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

Question # 2

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

Question # 3

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

Question # 4

The value of the metastable state for Neon is

Question # 5

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

Question # 6

Braking radiation causes:

Question # 7

Balmer series was identified in:

Question # 8

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

Question # 9

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

Question # 10

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

Question # 11

Coulomb multiplied by volt by volt gives the unit called:

Question # 12

The He-Ne laser discharge tube is filled with:

Question # 13

Gaussian surface is always:

Question # 14

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

Question # 15

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

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ECAT Physics Chapter 20 Important MCQ's

Sr.# Question Answer
1 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
2 By CAT scans, we can detect the density difference of the order of:
A. 1%
B. 20%
C. 30%
D. 50%
3 Photons must have energy equal to
A. ev
B. En
C. hf
D. None of these
4 The photocopying process is called:
A. Geography
B. Sonography
C. Xerography
D. Zerography
5 The results of spectra obtained by Blamer were expressed in 1896 by
A. Bohr
B. Rydberg
C. Planck
D. Rutherford
6 Static electricity is produced by the transfer of:
A. Electrons
B. Protons
C. One fluid
D. Two fluid
7 Tick the series which lie/s in. the infra-red region.
A. Pfund series
B. Brackett series
C. Paschen series
D. All of these
8 The transitions of electrons in the hydrogen atom result in the emission of spectral lies in the:
A. Ultra red region
B. Visible region
C. Ultraviolet region
D. Any of these
9 Graph of Black body radiation is example of
A. Band spectra
B. Continuo's spectra
C. Line spectra
D. All
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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