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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
Balmer series lies in that region of electromagnetic wave spectrum which is called:
Question # 2
Coulomb multiplied by volt by volt gives the unit called:
Question # 3
X-rays can penetrate in a solid matte through a distance of several:
Question # 4
Spectrum represents the number of component colours present in certain light in terms of:
Question # 5
The electric field lines start from:
Question # 6
The range of wavelengths of colurs in the visible colours is
Question # 7
The results of spectra obtained by Balmer were expressed in 1896 by:
Question # 8
Selenium is:
Question # 9
X-rays produced in a tube operating at 105V. The speed of X-rays produced is
Question # 10
An electron of the hydrogen atom in the second orbit is called its:
Question # 11
A metastable stae:
Question # 12
The holes created in the L and M shells are occupied by transitions of:
Question # 13
The shell closer to the nucleus is called:
Question # 14
The formula of Brackett series can be obtained by putting in the general formula, the value of n equal to:
Question # 15
An compared to solid matter, a crack or an air bubble allows:
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C Computer mail 28 - Apr - 2026 03 Min 26 Sec 48/60
ECAT Physics Chapter 20 Important MCQ's
| Sr.# | Question | Answer |
|---|---|---|
| 1 | Selenium is: |
A. An insulator
B. A conductor
C. Both A and B
D. Excellent conductor
|
| 2 | The value of the metastable state for Neon is |
A. 20.66eV
B. 20.61eV
C. 19.23eV
D. 18.70eV
|
| 3 | 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
|
| 4 | If the distance between two charges is doubled,the force between them will become: |
A. Double
B. Half
C. One third
D. One fourth
|
| 5 | 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
|
| 6 | 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
|
| 7 | The inkjet printer eject a thin stream of: |
A. Water
B. Oil
C. Ink
D. Any above
|
| 8 | The process of formation of spectrum is called: |
A. Interference
B. Spectroscopy
C. Dispersion
D. Reflection
|
| 9 | X-rays can penetrate in a solid matte through a distance of several: |
A. Kilo metres
B. Metres
C. Centimeters
D. A few angstroms
|
| 10 | Photons must have energy equal to |
A. ev
B. En
C. hf
D. None of these
|
Test Questions
Share your comments & questions here
Salmankhan
01 Feb 2018Some mcqs having wrong answers.