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

Question # 2

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

Question # 3

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

Question # 4

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

Question # 5

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

Question # 6

The life time of metastable state is equal to

Question # 7

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 # 8

The minimum wavelength of X-rays produced of 1KV potential difference is applied across the anode and cathode of the tube is

Question # 9

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

Question # 10

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

Question # 11

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

Question # 12

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

Question # 13

Ultraviolet region lies in ______ series

Question # 14

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

Question # 15

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

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ECAT Physics Chapter 20 Important MCQ's

Sr.# Question Answer
1 By CAT scans, we can detect the density difference of the order of:
A. 1%
B. 20%
C. 30%
D. 50%
2 The transitions of electrons in the hydrogen atom result in the emission of spectral lies in the:
A. Ultra red region
B. Visible region
C. Ultraviolet region
D. Any of these
3 Photons must have energy equal to
A. ev
B. En
C. hf
D. None of these
4 The value of the metastable state for Neon is
A. 20.66eV
B. 20.61eV
C. 19.23eV
D. 18.70eV
5 The process of formation of spectrum is called:
A. Interference
B. Spectroscopy
C. Dispersion
D. Reflection
6 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
7 Selenium is:
A. An insulator
B. A conductor
C. Both A and B
D. Excellent conductor
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
A. Less than atmospheric pressure
B. Much less than atmospheric pressure
C. Greater than atmospheric pressure
D. Much greater than atmospheric pressure
9 X-rays can penetrate in a solid matte through a distance of several:
A. Kilo metres
B. Metres
C. Centimeters
D. A few angstroms
10 Ultraviolet region lies in ______ series
A. Layman
B. Balmer
C. P fund
D. B racket

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