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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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Total Questions15
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Time Allowed20
ECAT Physics Chapter 20 Atomic Spectra
00:00
Question # 1
The lasing or active medium in He-Ne laser discharge tube is:
Question # 2
The process of formation of spectrum is called:
Question # 3
The spectrum emitted from hydrogen filled discharge tube is:
Question # 4
In helium Neon Laser Neon = 15% and Helium = 85% used. The lasing gas this unit is
Question # 5
In flesh, light element like carbon, hydrogen and oxygen predominate. Three elements allows ______ amount of incident X-ray to pass through them
Question # 6
Laser is a beam of:
Question # 7
The value of the metastable state for Neon is
Question # 8
X-rays produced in a tube operating at 105V. The speed of X-rays produced is
Question # 9
Consider a photon of continuous X-ray and a photon of characteristics X-ray of same wavelength. Which of the following is/are different for the two photons
Question # 10
The results of spectra obtained by Blamer were expressed in 1896 by
Question # 11
Tick the series which lie/s in. the infra-red region.
Question # 12
The transitions of electrons in the hydrogen atom result in the emission of spectral lies in the:
Question # 13
Gaussian surface is always:
Question # 14
The holes created in the L and M shells are occupied by transitions of:
Question # 15
Photons must have energy equal to
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ECAT Physics Chapter 20 Important MCQ's
| Sr.# | Question | Answer |
|---|---|---|
| 1 | 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
|
| 2 | 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
|
| 3 | 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
|
| 4 | The lasing or active medium in He-Ne laser discharge tube is: |
A. Nitrogen
B. Helium
C. Hydrogen
D. Neon
|
| 5 | Tick the series which lie/s in. the infra-red region. |
A. Pfund series
B. Brackett series
C. Paschen series
D. All of these
|
| 6 | 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
|
| 7 | X-rays produced in a tube operating at 105V. The speed of X-rays produced is |
A. 3 x 108m/s
B. 3.1 x 108m/s
C. 2.8 x 108m/s
D. 1.88 x 108m/s
|
| 8 | The spectrum emitted from hydrogen filled discharge tube is: |
A. Line spectrum
B. Discrete spectrum
C. And spectrum
D. Absorption spectrum
|
| 9 | The shell closer to the nucleus is called: |
A. N shell
B.
L shell
C. K shell
D. M shell
|
| 10 | Photons must have energy equal to |
A. ev
B. En
C. hf
D. None of these
|
Test Questions
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