ECAT Pre Computer Science Chapter 20 MCQ Test With Answer

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

CT scanning is the abbreviated name of

Question # 2

The He-Ne laser discharge tube is filled with:

Question # 3

Selenium is:

Question # 4

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

Question # 5

We can excite an atom by

Question # 6

The process of formation of spectrum is called:

Question # 7

Ultraviolet region lies in ______ series

Question # 8

The life time of metastable state is equal to

Question # 9

The electric field lines start from:

Question # 10

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

Question # 11

In case of braking radiations, when the rate of deceleration is very large, the emitted radiation corresponds to:

Question # 12

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

Question # 13

In flesh, light element like carbon, hydrogen and oxygen predominate. Three elements allows ______ amount of incident X-ray to pass through them

Question # 14

Spectrum represents the number of component colours present in certain light in terms of:

Question # 15

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

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ECAT Physics Chapter 20 Important MCQ's

Sr.# Question Answer
1 The electric field lines start from:
A. Positive charge
B. Negative charge
C. Either A and B
D. Neutron
2 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
3 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
4 Laser is a beam of:
A. Visible light
B. Infra red light
C. Ultra violet light
D. Violet light only
5 The photocopying process is called:
A. Geography
B. Sonography
C. Xerography
D. Zerography
6 A metastable stae:
A. Is an excited state
B. Is that in which excited electron is stable
C. Is that in which excited electron is usually unstable
D. Means a time interval of 10-8second
7 The value of the metastable state for Neon is
A. 20.66eV
B. 20.61eV
C. 19.23eV
D. 18.70eV
8 Static electricity is produced by the transfer of:
A. Electrons
B. Protons
C. One fluid
D. Two fluid
9 Selenium is:
A. An insulator
B. A conductor
C. Both A and B
D. Excellent conductor
10 Braking radiation causes:
A. Continuous spectrum
B. Line Spectrum
C. Band spectrum
D. Discrete specturm

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