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

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

Question # 2

Laser is a beam of:

Question # 3

The inkjet printer eject a thin stream of:

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

Coulomb multiplied by volt by volt gives the unit called:

Question # 6

The holes created in the L and M shells are occupied by transitions of:

Question # 7

Graph of Black body radiation is example of

Question # 8

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

Question # 9

The first series which was identified in the spectrum of hydrogen is called:

Question # 10

Ultraviolet region lies in ______ series

Question # 11

Tick the series which lies in the visible region:

Question # 12

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

Question # 13

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 # 14

The life time of metastable state is equal to

Question # 15

We can excite an atom by

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ECAT Physics Chapter 20 Important MCQ's

Sr.# Question Answer
1 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
2 The value of the metastable state for Neon is
A. 20.66eV
B. 20.61eV
C. 19.23eV
D. 18.70eV
3 In helium Neon Laser Neon = 15% and Helium = 85% used. The lasing gas this unit is
A. Helium
B. Neon
C. Both
D. None of these
4 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
5 The spectrum emitted from hydrogen filled discharge tube is:
A. Line spectrum
B. Discrete spectrum
C. And spectrum
D. Absorption spectrum
6 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
7 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
8 The lasing or active medium in He-Ne laser discharge tube is:
A. Nitrogen
B. Helium
C. Hydrogen
D. Neon
9 Gaussian surface is always:
A. Rectangular
B. Spherical
C. Cylinder
D. Box shape
10 Ultraviolet region lies in ______ series
A. Layman
B. Balmer
C. P fund
D. B racket

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