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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
Coulomb multiplied by volt by volt gives the unit called:
Question # 2
If the distance between two charges is doubled,the force between them will become:
Question # 3
The range of wavelengths of colurs in the visible colours is
Question # 4
Balmer series was identified in:
Question # 5
X-rays can penetrate in a solid matte through a distance of several:
Question # 6
We can excite an atom by
Question # 7
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 # 8
Graph of Black body radiation is example of
Question # 9
Laser is a beam of:
Question # 10
The first series which was identified in the spectrum of hydrogen is called:
Question # 11
The life time of metastable state is equal to
Question # 12
Photons must have energy equal to
Question # 13
The minimum wavelength of X-rays produced of 1KV potential difference is applied across the anode and cathode of the tube is
Question # 14
The electric field lines start from:
Question # 15
The photocopying process is called:
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ECAT Physics Chapter 20 Important MCQ's
| Sr.# | Question | Answer |
|---|---|---|
| 1 | 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
|
| 2 | An compared to solid matter, a crack or an air bubble allows: |
A. Great amount of X-rays to pass
B. Smallast amount of X-rays to pass
C. Very samall amount of X-rays to pass
D. Any of these
|
| 3 | 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
|
| 4 | Photons must have energy equal to |
A. ev
B. En
C. hf
D. None of these
|
| 5 | Graph of Black body radiation is example of |
A. Band spectra
B. Continuo's spectra
C. Line spectra
D. All
|
| 6 | Ultraviolet region lies in ______ series |
A. Layman
B. Balmer
C. P fund
D. B racket
|
| 7 | Energy required by an electron revolving in certain orbit to jump to an excited state is called: |
A. Ionization energy
B. Ionization potential
C. Excitation energy
D. Excitation potential
|
| 8 | The value of the metastable state for Neon is |
A. 20.66eV
B. 20.61eV
C. 19.23eV
D. 18.70eV
|
| 9 | 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
|
| 10 | The lasing or active medium in He-Ne laser discharge tube is: |
A. Nitrogen
B. Helium
C. Hydrogen
D. Neon
|
Test Questions
Share your comments & questions here
Salmankhan
01 Feb 2018Some mcqs having wrong answers.