ECAT Pre Computer Science Chapter 20 MCQ Test With Answer

MCQ's Test For ECAT Physics Chapter 20 Atomic Spectra

Try The MCQ's Test For ECAT Physics Chapter 20 Atomic Spectra

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ECAT Physics Chapter 20 Atomic Spectra

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Question # 1

The life time of metastable state is equal to

Question # 2

CT scanning is the abbreviated name of

Question # 3

Lyman series in the spectrum of hydrogen exists in the :

Question # 4

The results of spectra obtained by Balmer were expressed in 1896 by:

Question # 5

The minimum wavelength of X-rays produced of 1KV potential difference is applied across the anode and cathode of the tube is

Question # 6

Selenium is:

Question # 7

An compared to solid matter, a crack or an air bubble allows:

Question # 8

Balmer series was identified in:

Question # 9

Laser is a beam of:

Question # 10

Ultraviolet region lies in ______ series

Question # 11

The formula of Brackett series can be obtained by putting in the general formula, the value of n equal to:

Question # 12

X-rays produced in a tube operating at 105V. The speed of X-rays produced is

Question # 13

The He-Ne laser discharge tube is filled with:

Question # 14

The transitions of electrons in the hydrogen atom result in the emission of spectral lies in the:

Question # 15

Balmer series lies in that region of electromagnetic wave spectrum which is called:

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ECAT Physics Chapter 20 Important MCQ's

Sr.# Question Answer
1 Braking radiation causes:
A. Continuous spectrum
B. Line Spectrum
C. Band spectrum
D. Discrete specturm
2 In flesh, light element like carbon, hydrogen and oxygen predominate. Three elements allows ______ amount of incident X-ray to pass through them
A. Small
B. Greater
C. Equal
D. Sometimes
3 The He-Ne laser discharge tube is filled with:
A. 85% He
B. 15% He
C. 50% He
D. 60% He
4 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
5 Ultraviolet region lies in ______ series
A. Layman
B. Balmer
C. P fund
D. B racket
6 We can excite an atom by
A. Bombardment of particles
B. Radiating photons
C. Providing potential difference
D. All answer are true
7 Balmer series lies in that region of electromagnetic wave spectrum which is called:
A. Visible region
B. Invisible region
C. Infra-red region
D. ultraviolet region
8 Gaussian surface is always:
A. Rectangular
B. Spherical
C. Cylinder
D. Box shape
9 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
10 The results of spectra obtained by Balmer were expressed in 1896 by:
A.
Bohr
B. Rydberg
C. Planck
D. Rutherford

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