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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 value of the metastable state for Neon is
Question # 2
In helium Neon Laser Neon = 15% and Helium = 85% used. The lasing gas this unit is
Question # 3
The inkjet printer eject a thin stream of:
Question # 4
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
Question # 5
X-rays can penetrate in a solid matte through a distance of several:
Question # 6
Coulomb multiplied by volt by volt gives the unit called:
Question # 7
Photons must have energy equal to
Question # 8
The lasing or active medium in He-Ne laser discharge tube is:
Question # 9
Energy required by an electron revolving in certain orbit to jump to an excited state is called:
Question # 10
The formula of Brackett series can be obtained by putting in the general formula, the value of n equal to:
Question # 11
The electric field lines start from:
Question # 12
The process of formation of spectrum is called:
Question # 13
X-rays produced in a tube operating at 105V. The speed of X-rays produced is
Question # 14
Graph of Black body radiation is example of
Question # 15
The minimum wavelength of X-rays produced of 1KV potential difference is applied across the anode and cathode of the tube is
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ECAT Physics Chapter 20 Important MCQ's
| Sr.# | Question | Answer |
|---|---|---|
| 1 | 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
|
| 2 | By CAT scans, we can detect the density difference of the order of: |
A. 1%
B. 20%
C. 30%
D. 50%
|
| 3 | 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
|
| 4 | Ultraviolet region lies in ______ series |
A. Layman
B. Balmer
C. P fund
D. B racket
|
| 5 | The inkjet printer eject a thin stream of: |
A. Water
B. Oil
C. Ink
D. Any above
|
| 6 | Balmer series was identified in: |
A. 1685
B. 1785
C. 1885
D. 1985
|
| 7 | 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)
|
| 8 | The process of formation of spectrum is called: |
A. Interference
B. Spectroscopy
C. Dispersion
D. Reflection
|
| 9 | The electric field lines start from: |
A. Positive charge
B. Negative charge
C. Either A and B
D. Neutron
|
| 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
|
Test Questions