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

Lyman series in the spectrum of hydrogen exists in the :

Question # 2

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

Question # 3

Balmer series was identified in:

Question # 4

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

Question # 5

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

Question # 6

CT scanning is the abbreviated name of

Question # 7

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

Question # 8

Photons must have energy equal to

Question # 9

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

Question # 10

Ultraviolet region lies in ______ series

Question # 11

Balmer series lies in that region of electromagnetic wave spectrum which is called:

Question # 12

The He-Ne laser discharge tube is filled with:

Question # 13

X-rays can penetrate in a solid matte through a distance of several:

Question # 14

The electric field lines start from:

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 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
2 Laser is a beam of:
A. Visible light
B. Infra red light
C. Ultra violet light
D. Violet light only
3 If the distance between two charges is doubled,the force between them will become:
A. Double
B. Half
C. One third
D. One fourth
4 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
5 Lyman series in the spectrum of hydrogen exists in the :
A. Infra-red region
B. Visible region
C. Ultraviolet region
D. Both(A) and (B)
6 A metastable stae:
A. Is an excited state
B. Is that in which excited electron is stable
C. Is that in which excited electron is usually unstable
D. Means a time interval of 10-8second
7 Spectrum represents the number of component colours present in certain light in terms of:
A. Wavelength
B. Frequency
C. Energy
D. Both (A) and (B)
8 The photocopying process is called:
A. Geography
B. Sonography
C. Xerography
D. Zerography
9 Energy required by an electron revolving in certain orbit to jump to an excited state is called:
A. Ionization energy
B. Ionization potential
C. Excitation energy
D. Excitation potential
10 The spectrum emitted from hydrogen filled discharge tube is:
A. Line spectrum
B. Discrete spectrum
C. And spectrum
D. Absorption spectrum

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