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

In flesh, light element like carbon, hydrogen and oxygen predominate. Three elements allows ______ amount of incident X-ray to pass through them

Question # 2

Coulomb multiplied by volt by volt gives the unit called:

Question # 3

The range of wavelengths of colurs in the visible colours is

Question # 4

Tick the series which lies in the visible region:

Question # 5

Photons must have energy equal to

Question # 6

Balmer series was identified in:

Question # 7

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

Question # 8

The holes created in the L and M shells are occupied by transitions of:

Question # 9

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

Question # 10

A metastable stae:

Question # 11

The value of the metastable state for Neon is

Question # 12

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

Question # 13

The He-Ne laser discharge tube is filled with:

Question # 14

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

Question # 15

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

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ECAT Physics Chapter 20 Important MCQ's

Sr.# Question Answer
1 X-rays can penetrate in a solid matte through a distance of several:
A. Kilo metres
B. Metres
C. Centimeters
D. A few angstroms
2 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
3 The He-Ne laser discharge tube is filled with:
A. 85% He
B. 15% He
C. 50% He
D. 60% He
4 The life time of metastable state is equal to
A. Life time of excited state
B. Greater than by excited state
C. Zero
D. Less than by excited state
5 Gaussian surface is always:
A. Rectangular
B. Spherical
C. Cylinder
D. Box shape
6 If the distance between two charges is doubled,the force between them will become:
A. Double
B. Half
C. One third
D. One fourth
7 The first series which was identified in the spectrum of hydrogen is called:
A. Lyman series
B. Balmer series
C. Paschen series
D. Brackett series
8 Graph of Black body radiation is example of
A. Band spectra
B. Continuo's spectra
C. Line spectra
D. All
9 The photocopying process is called:
A. Geography
B. Sonography
C. Xerography
D. Zerography
10 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
A. Less than atmospheric pressure
B. Much less than atmospheric pressure
C. Greater than atmospheric pressure
D. Much greater than atmospheric pressure

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