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

00:00
Question # 1

Energy required by an electron revolving in certain orbit to jump to an excited state is called:

Question # 2

Gaussian surface is always:

Question # 3

The electric field lines start from:

Question # 4

The He-Ne laser discharge tube is filled with:

Question # 5

Coulomb multiplied by volt by volt gives the unit called:

Question # 6

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

Question # 7

The first series which was identified in the spectrum of hydrogen is called:

Question # 8

Lyman series in the spectrum of hydrogen exists in the :

Question # 9

The lasing or active medium in He-Ne laser discharge tube is:

Question # 10

The photocopying process is called:

Question # 11

Photons must have energy equal to

Question # 12

We can excite an atom by

Question # 13

X-rays can penetrate in a solid matte through a distance of several:

Question # 14

Static electricity is produced by the transfer of:

Question # 15

The life time of metastable state is equal to

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ECAT Physics Chapter 20 Important MCQ's

Sr.# Question Answer
1 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
2 Selenium is:
A. An insulator
B. A conductor
C. Both A and B
D. Excellent conductor
3 The results of spectra obtained by Balmer were expressed in 1896 by:
A.
Bohr
B. Rydberg
C. Planck
D. Rutherford
4 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
5 Gaussian surface is always:
A. Rectangular
B. Spherical
C. Cylinder
D. Box shape
6 The results of spectra obtained by Blamer were expressed in 1896 by
A. Bohr
B. Rydberg
C. Planck
D. Rutherford
7 Laser is a beam of:
A. Visible light
B. Infra red light
C. Ultra violet light
D. Violet light only
8 Braking radiation causes:
A. Continuous spectrum
B. Line Spectrum
C. Band spectrum
D. Discrete specturm
9 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
10 The first series which was identified in the spectrum of hydrogen is called:
A. Lyman series
B. Balmer series
C. Paschen series
D. Brackett series

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