ECAT Pre Engineering Physics Chapter 20 MCQ Test With Answer

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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Physics ECAT Pre Engineering Chapter 20 Atomic Spectra

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Question # 1

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

Question # 2

Tick the series which lie/s in. the infra-red region.

Question # 3

The range of wavelengths of colurs in the visible colours is

Question # 4

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

Question # 5

An electron of the hydrogen atom in the second orbit is called its:

Question # 6

The life time of metastable state is equal to

Question # 7

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

Question # 8

Braking radiation causes:

Question # 9

Selenium is:

Question # 10

The inkjet printer eject a thin stream of:

Question # 11

Photons must have energy equal to

Question # 12

Coulomb multiplied by volt by volt gives the unit called:

Question # 13

If the distance between two charges is doubled,the force between them will become:

Question # 14

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

Question # 15

The He-Ne laser discharge tube is filled with:

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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 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
3 The electric field lines start from:
A. Positive charge
B. Negative charge
C. Either A and B
D. Neutron
4 X-ray are also known as
A. Roentgen rays
B. Maxwell rays
C. Plank range
D. Einstein rays
5 The He-Ne laser discharge tube is filled with:
A. 85% He
B. 15% He
C. 50% He
D. 60% He
6 Tick the series which lie/s in. the infra-red region.
A. Pfund series
B. Brackett series
C. Paschen series
D. All of these
7 The results of spectra obtained by Balmer were expressed in 1896 by:
A.
Bohr
B. Rydberg
C. Planck
D. Rutherford
8 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
9 Gaussian surface is always:
A. Rectangular
B. Spherical
C. Cylinder
D. Box shape
10 Lyman series in the spectrum of hydrogen exists in the :
A. Infra-red region
B. Visible region
C. Ultraviolet region
D. Both(A) and (B)

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