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

Tick the series which lies in the visible region:

Question # 2

The natural arrangement of colours in the spectrum of white light spectrum is

Question # 3

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

Question # 4

In helium Neon Laser Neon = 15% and Helium = 85% used. The lasing gas this unit is

Question # 5

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

Question # 6

The life time of metastable state is equal to

Question # 7

Static electricity is produced by the transfer of:

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

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

Question # 10

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

Question # 11

Balmer series was identified in:

Question # 12

A metastable stae:

Question # 13

Consider a photon of continuous X-ray and a photon of characteristics X-ray of same wavelength. Which of the following is/are different for the two photons

Question # 14

The process of formation of spectrum is called:

Question # 15

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

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ECAT Physics Chapter 20 Important MCQ's

Sr.# Question Answer
1 Ultraviolet region lies in ______ series
A. Layman
B. Balmer
C. P fund
D. B racket
2 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
3 The photocopying process is called:
A. Geography
B. Sonography
C. Xerography
D. Zerography
4 Static electricity is produced by the transfer of:
A. Electrons
B. Protons
C. One fluid
D. Two fluid
5 The first shell near the neucles is
A. L-shell
B. X-shell
C. N-shell
D. M-shell
6 The shell closer to the nucleus is called:
A. N shell
B.
L shell
C. K shell
D. M shell
7 The spectrum emitted from hydrogen filled discharge tube is:
A. Line spectrum
B. Discrete spectrum
C. And spectrum
D. Absorption spectrum
8 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
9 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
10 Gaussian surface is always:
A. Rectangular
B. Spherical
C. Cylinder
D. Box shape

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