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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 life time of metastable state is equal to
Question # 2
The process of formation of spectrum is called:
Question # 3
Photons must have energy equal to
Question # 4
A metastable stae:
Question # 5
The range of wavelengths of colurs in the visible colours is
Question # 6
The results of spectra obtained by Blamer were expressed in 1896 by
Question # 7
Graph of Black body radiation is example of
Question # 8
The value of the metastable state for Neon is
Question # 9
The formula of Brackett series can be obtained by putting in the general formula, the value of n equal to:
Question # 10
CT scanning is the abbreviated name of
Question # 11
The transitions of electrons in the hydrogen atom result in the emission of spectral lies in the:
Question # 12
An compared to solid matter, a crack or an air bubble allows:
Question # 13
The holes created in the L and M shells are occupied by transitions of:
Question # 14
We can excite an atom by
Question # 15
Gaussian surface is always:
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ECAT Physics Chapter 20 Important MCQ's
| Sr.# | Question | Answer |
|---|---|---|
| 1 | 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
|
| 2 | X-rays can penetrate in a solid matte through a distance of several: |
A. Kilo metres
B. Metres
C. Centimeters
D. A few angstroms
|
| 3 | The photocopying process is called: |
A. Geography
B. Sonography
C. Xerography
D. Zerography
|
| 4 | The holes created in the L and M shells are occupied by transitions of: |
A. Electrons from lower states
B. Electrons from higher state
C. Positrons from higher states
D. Electrons from K shell
|
| 5 | The shell closer to the nucleus is called: |
A. N shell
B.
L shell
C. K shell
D. M shell
|
| 6 | 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 |
A. Frequency
B. Penetrating power
C. Energy
D. Method of creation
|
| 7 | 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
|
| 8 | Tick the series which lie/s in. the infra-red region. |
A. Pfund series
B. Brackett series
C. Paschen series
D. All of these
|
| 9 | The results of spectra obtained by Blamer were expressed in 1896 by |
A. Bohr
B. Rydberg
C. Planck
D. Rutherford
|
| 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