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

The spectrum emitted from hydrogen filled discharge tube is:

Question # 2

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

Question # 3

An electron of the hydrogen atom in the second orbit is called its:

Question # 4

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

Question # 5

Photons must have energy equal to

Question # 6

Selenium is:

Question # 7

An compared to solid matter, a crack or an air bubble allows:

Question # 8

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

Question # 9

The photocopying process is called:

Question # 10

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

Question # 11

Gaussian surface is always:

Question # 12

CT scanning is the abbreviated name of

Question # 13

X-rays produced in a tube operating at 105V. The speed of X-rays produced is

Question # 14

Balmer series was identified in:

Question # 15

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

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ECAT Physics Chapter 20 Important MCQ's

Sr.# Question Answer
1 The results of spectra obtained by Balmer were expressed in 1896 by:
A.
Bohr
B. Rydberg
C. Planck
D. Rutherford
2 Braking radiation causes:
A. Continuous spectrum
B. Line Spectrum
C. Band spectrum
D. Discrete specturm
3 The life time of metastable state is equal to
A. Life time of excited state
B. Greater than by excited state
C. Zero
D. Less than by excited state
4 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
5 Graph of Black body radiation is example of
A. Band spectra
B. Continuo's spectra
C. Line spectra
D. All
6 Static electricity is produced by the transfer of:
A. Electrons
B. Protons
C. One fluid
D. Two fluid
7 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
8 X-ray are also known as
A. Roentgen rays
B. Maxwell rays
C. Plank range
D. Einstein rays
9 Ultraviolet region lies in ______ series
A. Layman
B. Balmer
C. P fund
D. B racket
10 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
A. Frequency
B. Penetrating power
C. Energy
D. Method of creation

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