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

00:00
Question # 1

Laser is a beam of:

Question # 2

Ultraviolet region lies in ______ series

Question # 3

Static electricity is produced by the transfer of:

Question # 4

Braking radiation causes:

Question # 5

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

Question # 6

A metastable stae:

Question # 7

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

Question # 8

X-ray are also known as

Question # 9

The inkjet printer eject a thin stream of:

Question # 10

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

Question # 11

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

Question # 12

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

Question # 13

Coulomb multiplied by volt by volt gives the unit called:

Question # 14

The process of formation of spectrum is called:

Question # 15

Tick the series which lies in the visible region:

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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 X-rays produced in a tube operating at 105V. The speed of X-rays produced is
A. 3 x 108m/s
B. 3.1 x 108m/s
C. 2.8 x 108m/s
D. 1.88 x 108m/s
3 The He-Ne laser discharge tube is filled with:
A. 85% He
B. 15% He
C. 50% He
D. 60% He
4 Ultraviolet region lies in ______ series
A. Layman
B. Balmer
C. P fund
D. B racket
5 If the distance between two charges is doubled,the force between them will become:
A. Double
B. Half
C. One third
D. One fourth
6 An electron of the hydrogen atom in the second orbit is called its:
A. Ground state
B. Excited state
C. Ionized state
D. Any of these
7 The holes created in the L and M shells are occupied by transitions of:
A. Electrons from lower states
B. Electrons from higher state
C. Positrons from higher states
D. Electrons from K shell
8 The lasing or active medium in He-Ne laser discharge tube is:
A. Nitrogen
B. Helium
C. Hydrogen
D. Neon
9 The results of spectra obtained by Balmer were expressed in 1896 by:
A.
Bohr
B. Rydberg
C. Planck
D. Rutherford
10 The spectrum emitted from hydrogen filled discharge tube is:
A. Line spectrum
B. Discrete spectrum
C. And spectrum
D. Absorption spectrum

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