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MCQ's Test For Physics ECAT Pre Engineering Chapter 20 Atomic Spectra
Try The MCQ's Test For Physics ECAT Pre Engineering Chapter 20 Atomic Spectra
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Total Questions15
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Time Allowed20
Physics ECAT Pre Engineering Chapter 20 Atomic Spectra
00:00
Question # 1
The lasing or active medium in He-Ne laser discharge tube is:
Question # 2
The results of spectra obtained by Blamer were expressed in 1896 by
Question # 3
We can excite an atom by
Question # 4
X-rays can penetrate in a solid matte through a distance of several:
Question # 5
Lyman series in the spectrum of hydrogen exists in the :
Question # 6
The spectrum emitted from hydrogen filled discharge tube is:
Question # 7
The minimum wavelength of X-rays produced of 1KV potential difference is applied across the anode and cathode of the tube is
Question # 8
The inkjet printer eject a thin stream of:
Question # 9
Coulomb multiplied by volt by volt gives the unit called:
Question # 10
The holes created in the L and M shells are occupied by transitions of:
Question # 11
Spectrum represents the number of component colours present in certain light in terms of:
Question # 12
If the distance between two charges is doubled,the force between them will become:
Question # 13
In helium Neon Laser Neon = 15% and Helium = 85% used. The lasing gas this unit is
Question # 14
Balmer series lies in that region of electromagnetic wave spectrum which is called:
Question # 15
Laser is a beam of:
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ECAT Physics Chapter 20 Important MCQ's
| Sr.# | Question | Answer |
|---|---|---|
| 1 | 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
|
| 2 | 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
|
| 3 | X-rays can penetrate in a solid matte through a distance of several: |
A. Kilo metres
B. Metres
C. Centimeters
D. A few angstroms
|
| 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 | 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
|
| 6 | Static electricity is produced by the transfer of: |
A. Electrons
B. Protons
C. One fluid
D. Two fluid
|
| 7 | 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
|
| 8 | Tick the series which lie/s in. the infra-red region. |
A. Pfund series
B. Brackett series
C. Paschen series
D. All of these
|
| 9 | The process of formation of spectrum is called: |
A. Interference
B. Spectroscopy
C. Dispersion
D. Reflection
|
| 10 | Ultraviolet region lies in ______ series |
A. Layman
B. Balmer
C. P fund
D. B racket
|
Test Questions