ECAT Pre Computer Science Chapter 20 MCQ Test With Answer

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

Graph of Black body radiation is example of

Question # 2

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

Question # 3

Static electricity is produced by the transfer of:

Question # 4

Balmer series was identified in:

Question # 5

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

Question # 6

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

Question # 7

A metastable stae:

Question # 8

The life time of metastable state is equal to

Question # 9

The process of formation of spectrum is called:

Question # 10

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

Question # 11

The value of the metastable state for Neon is

Question # 12

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

Question # 13

The range of wavelengths of colurs in the visible colours is

Question # 14

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

Question # 15

We can excite an atom by

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ECAT Physics Chapter 20 Important MCQ's

Sr.# Question Answer
1 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
2 By CAT scans, we can detect the density difference of the order of:
A. 1%
B. 20%
C. 30%
D. 50%
3 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
4 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
5 Tick the series which lies in the visible region:
A. Lyman series
B. Balmer series
C. Paschen series
D. Brackett series
6 Coulomb multiplied by volt by volt gives the unit called:
A. farad
B. Ohm
C. Second
D. joule
7 The lasing or active medium in He-Ne laser discharge tube is:
A. Nitrogen
B. Helium
C. Hydrogen
D. Neon
8 Gaussian surface is always:
A. Rectangular
B. Spherical
C. Cylinder
D. Box shape
9 The natural arrangement of colours in the spectrum of white light spectrum is
A. VIBGYOR
B. ROYBGIV
C. ROYBIGV
D. BIGROYV
10 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)

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