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 process of formation of spectrum is called:

Question # 2

Balmer series was identified in:

Question # 3

Tick the series which lies in the visible region:

Question # 4

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

Question # 5

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

Question # 6

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

Question # 7

The life time of metastable state is equal to

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

X-ray are also known as

Question # 10

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

Question # 11

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

Question # 12

The photocopying process is called:

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

Question # 15

Ultraviolet region lies in ______ series

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ECAT Physics Chapter 20 Important MCQ's

Sr.# Question Answer
1 Spectrum represents the number of component colours present in certain light in terms of:
A. Wavelength
B. Frequency
C. Energy
D. Both (A) and (B)
2 The He-Ne laser discharge tube is filled with:
A. 85% He
B. 15% He
C. 50% He
D. 60% He
3 The results of spectra obtained by Balmer were expressed in 1896 by:
A.
Bohr
B. Rydberg
C. Planck
D. Rutherford
4 The natural arrangement of colours in the spectrum of white light spectrum is
A. VIBGYOR
B. ROYBGIV
C. ROYBIGV
D. BIGROYV
5 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
6 If the distance between two charges is doubled,the force between them will become:
A. Double
B. Half
C. One third
D. One fourth
7 Static electricity is produced by the transfer of:
A. Electrons
B. Protons
C. One fluid
D. Two fluid
8 Braking radiation causes:
A. Continuous spectrum
B. Line Spectrum
C. Band spectrum
D. Discrete specturm
9 Laser is a beam of:
A. Visible light
B. Infra red light
C. Ultra violet light
D. Violet light only
10 Lyman series in the spectrum of hydrogen exists in the :
A. Infra-red region
B. Visible region
C. Ultraviolet region
D. Both(A) and (B)

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