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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 electric field lines start from:
Question # 2
The transitions of electrons in the hydrogen atom result in the emission of spectral lies in the:
Question # 3
X-rays produced in a tube operating at 105V. The speed of X-rays produced is
Question # 4
The natural arrangement of colours in the spectrum of white light spectrum is
Question # 5
The formula of Brackett series can be obtained by putting in the general formula, the value of n equal to:
Question # 6
The first series which was identified in the spectrum of hydrogen is called:
Question # 7
If the distance between two charges is doubled,the force between them will become:
Question # 8
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 # 9
Energy required by an electron revolving in certain orbit to jump to an excited state is called:
Question # 10
Lyman series in the spectrum of hydrogen exists in the :
Question # 11
The holes created in the L and M shells are occupied by transitions of:
Question # 12
Coulomb multiplied by volt by volt gives the unit called:
Question # 13
The results of spectra obtained by Blamer were expressed in 1896 by
Question # 14
CT scanning is the abbreviated name of
Question # 15
Selenium is:
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ECAT Physics Chapter 20 Important MCQ's
| Sr.# | Question | Answer |
|---|---|---|
| 1 | 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
|
| 2 | By CAT scans, we can detect the density difference of the order of: |
A. 1%
B. 20%
C. 30%
D. 50%
|
| 3 | If the distance between two charges is doubled,the force between them will become: |
A. Double
B. Half
C. One third
D. One fourth
|
| 4 | X-rays can penetrate in a solid matte through a distance of several: |
A. Kilo metres
B. Metres
C. Centimeters
D. A few angstroms
|
| 5 | Photons must have energy equal to |
A. ev
B. En
C. hf
D. None of these
|
| 6 | Ultraviolet region lies in ______ series |
A. Layman
B. Balmer
C. P fund
D. B racket
|
| 7 | 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
|
| 8 | Braking radiation causes: |
A. Continuous spectrum
B. Line Spectrum
C. Band spectrum
D. Discrete specturm
|
| 9 | 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
|
| 10 | The shell closer to the nucleus is called: |
A. N shell
B.
L shell
C. K shell
D. M shell
|
Test Questions
Share your comments & questions here
Salmankhan
01 Feb 2018Some mcqs having wrong answers.