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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
Spectrum represents the number of component colours present in certain light in terms of:
Question # 2
The results of spectra obtained by Blamer were expressed in 1896 by
Question # 3
Tick the series which lies in the visible region:
Question # 4
The first shell near the neucles is
Question # 5
The results of spectra obtained by Balmer were expressed in 1896 by:
Question # 6
Photons must have energy equal to
Question # 7
A metastable stae:
Question # 8
Gaussian surface is always:
Question # 9
X-rays produced in a tube operating at 105V. The speed of X-rays produced is
Question # 10
An compared to solid matter, a crack or an air bubble allows:
Question # 11
Balmer series was identified in:
Question # 12
In case of braking radiations, when the rate of deceleration is very large, the emitted radiation corresponds to:
Question # 13
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 # 14
An electron of the hydrogen atom in the second orbit is called its:
Question # 15
The formula of Brackett series can be obtained by putting in the general formula, the value of n equal to:
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ECAT Physics Chapter 20 Important MCQ's
| Sr.# | Question | Answer |
|---|---|---|
| 1 | Gaussian surface is always: |
A. Rectangular
B. Spherical
C. Cylinder
D. Box shape
|
| 2 | The photocopying process is called: |
A. Geography
B. Sonography
C. Xerography
D. Zerography
|
| 3 | 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)
|
| 4 | In case of braking radiations, when the rate of deceleration is very large, the emitted radiation corresponds to: |
A. Short wavelength
B. Large wavelength
C. Very large wavelenth
D. Low frequency
|
| 5 | The lasing or active medium in He-Ne laser discharge tube is: |
A. Nitrogen
B. Helium
C. Hydrogen
D. Neon
|
| 6 | Balmer series was identified in: |
A. 1685
B. 1785
C. 1885
D. 1985
|
| 7 | The minimum wavelength of X-rays produced of 1KV potential difference is applied across the anode and cathode of the tube is |
A. 1.24 x 10-10m
B. 7.92 x 10-20m
C. 2.78 x 10-14m
D. 3.88 x 10-11m
|
| 8 | The value of the metastable state for Neon is |
A. 20.66eV
B. 20.61eV
C. 19.23eV
D. 18.70eV
|
| 9 | 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
|
| 10 | The electric field lines start from: |
A. Positive charge
B. Negative charge
C. Either A and B
D. Neutron
|
Test Questions
Share your comments & questions here
Salmankhan
01 Feb 2018Some mcqs having wrong answers.