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

Question # 2

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

Question # 3

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

Question # 4

A metastable stae:

Question # 5

The results of spectra obtained by Blamer were expressed in 1896 by

Question # 6

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

Question # 7

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

Question # 8

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

Question # 9

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

Question # 10

The process of formation of spectrum is called:

Question # 11

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

Question # 12

X-ray are also known as

Question # 13

Laser is a beam of:

Question # 14

CT scanning is the abbreviated name of

Question # 15

Selenium is:

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ECAT Physics Chapter 20 Important MCQ's

Sr.# Question Answer
1 The He-Ne laser discharge tube is filled with:
A. 85% He
B. 15% He
C. 50% He
D. 60% He
2 The shell closer to the nucleus is called:
A. N shell
B.
L shell
C. K shell
D. M shell
3 Graph of Black body radiation is example of
A. Band spectra
B. Continuo's spectra
C. Line spectra
D. All
4 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
5 The inkjet printer eject a thin stream of:
A. Water
B. Oil
C. Ink
D. Any above
6 Ultraviolet region lies in ______ series
A. Layman
B. Balmer
C. P fund
D. B racket
7 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
8 Selenium is:
A. An insulator
B. A conductor
C. Both A and B
D. Excellent conductor
9 If the distance between two charges is doubled,the force between them will become:
A. Double
B. Half
C. One third
D. One fourth
10 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

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