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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
By CAT scans, we can detect the density difference of the order of:
Question # 2
X-rays produced in a tube operating at 105V. The speed of X-rays produced is
Question # 3
The first series which was identified in the spectrum of hydrogen is called:
Question # 4
Braking radiation causes:
Question # 5
The natural arrangement of colours in the spectrum of white light spectrum is
Question # 6
The electric field lines start from:
Question # 7
The spectrum emitted from hydrogen filled discharge tube is:
Question # 8
The shell closer to the nucleus is called:
Question # 9
The first shell near the neucles is
Question # 10
An compared to solid matter, a crack or an air bubble allows:
Question # 11
A metastable stae:
Question # 12
In flesh, light element like carbon, hydrogen and oxygen predominate. Three elements allows ______ amount of incident X-ray to pass through them
Question # 13
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 # 14
The inkjet printer eject a thin stream of:
Question # 15
The He-Ne laser discharge tube is filled with:
Top Scorers Of Physics ECAT Pre Engineering Chapter 20 Atomic Spectra MCQ`s Test
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A Abdullah Zubair 11 - Jan - 2025 03 Min 10 Sec 45/60
ECAT Physics Chapter 20 Important MCQ's
| Sr.# | Question | Answer |
|---|---|---|
| 1 | Photons must have energy equal to |
A. ev
B. En
C. hf
D. None of these
|
| 2 | In helium Neon Laser Neon = 15% and Helium = 85% used. The lasing gas this unit is |
A. Helium
B. Neon
C. Both
D. None of these
|
| 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 | 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
|
| 5 | Gaussian surface is always: |
A. Rectangular
B. Spherical
C. Cylinder
D. Box shape
|
| 6 | The shell closer to the nucleus is called: |
A. N shell
B.
L shell
C. K shell
D. M shell
|
| 7 | 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
|
| 8 | 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
|
| 9 | The range of wavelengths of colurs in the visible colours is |
A. 140 nm to 456 nm
B. 10 nm to 56 nm
C. 410 nm to 656 nm
D. 910 nm to 956 nm
|
| 10 | Braking radiation causes: |
A. Continuous spectrum
B. Line Spectrum
C. Band spectrum
D. Discrete specturm
|
Test Questions
