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

CT scanning is the abbreviated name of

Question # 2

The first shell near the neucles is

Question # 3

Photons must have energy equal to

Question # 4

The He-Ne laser discharge tube is filled with:

Question # 5

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

Question # 6

The value of the metastable state for Neon is

Question # 7

The electric field lines start from:

Question # 8

Balmer series was identified in:

Question # 9

Graph of Black body radiation is example of

Question # 10

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

Question # 11

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

Question # 12

The process of formation of spectrum is called:

Question # 13

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

Question # 14

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

Question # 15

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

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ECAT Physics Chapter 20 Important MCQ's

Sr.# Question Answer
1 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
2 Balmer series lies in that region of electromagnetic wave spectrum which is called:
A. Visible region
B. Invisible region
C. Infra-red region
D. ultraviolet region
3 The holes created in the L and M shells are occupied by transitions of:
A. Electrons from lower states
B. Electrons from higher state
C. Positrons from higher states
D. Electrons from K shell
4 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
5 Laser is a beam of:
A. Visible light
B. Infra red light
C. Ultra violet light
D. Violet light only
6 The results of spectra obtained by Balmer were expressed in 1896 by:
A.
Bohr
B. Rydberg
C. Planck
D. Rutherford
7 The shell closer to the nucleus is called:
A. N shell
B.
L shell
C. K shell
D. M shell
8 The formula of Brackett series can be obtained by putting in the general formula, the value of n equal to:
A.
one
B. two
C. three
D. four
9 The results of spectra obtained by Blamer were expressed in 1896 by
A. Bohr
B. Rydberg
C. Planck
D. Rutherford
10 An compared to solid matter, a crack or an air bubble allows:
A. Great amount of X-rays to pass
B. Smallast amount of X-rays to pass
C. Very samall amount of X-rays to pass
D. Any of these

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