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 spectrum emitted from hydrogen filled discharge tube is:

Question # 2

The photocopying process is called:

Question # 3

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

Question # 4

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

Question # 5

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

Question # 6

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

Question # 7

Energy required by an electron revolving in certain orbit to jump to an excited state is called:

Question # 8

The range of wavelengths of colurs in the visible colours is

Question # 9

Laser is a beam of:

Question # 10

The first shell near the neucles is

Question # 11

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 # 12

The shell closer to the nucleus is called:

Question # 13

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

Question # 14

Braking radiation causes:

Question # 15

The life time of metastable state is equal to

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ECAT Physics Chapter 20 Important MCQ's

Sr.# Question Answer
1 The shell closer to the nucleus is called:
A. N shell
B.
L shell
C. K shell
D. M shell
2 The results of spectra obtained by Balmer were expressed in 1896 by:
A.
Bohr
B. Rydberg
C. Planck
D. Rutherford
3 Balmer series was identified in:
A. 1685
B. 1785
C. 1885
D. 1985
4 The He-Ne laser discharge tube is filled with:
A. 85% He
B. 15% He
C. 50% He
D. 60% He
5 Gaussian surface is always:
A. Rectangular
B. Spherical
C. Cylinder
D. Box shape
6 The first shell near the neucles is
A. L-shell
B. X-shell
C. N-shell
D. M-shell
7 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
8 Ultraviolet region lies in ______ series
A. Layman
B. Balmer
C. P fund
D. B racket
9 Graph of Black body radiation is example of
A. Band spectra
B. Continuo's spectra
C. Line spectra
D. All
10 The natural arrangement of colours in the spectrum of white light spectrum is
A. VIBGYOR
B. ROYBGIV
C. ROYBIGV
D. BIGROYV

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