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

Ultraviolet region lies in ______ series

Question # 2

Laser is a beam of:

Question # 3

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

Question # 4

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

Question # 5

The spectrum emitted from hydrogen filled discharge tube is:

Question # 6

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

Question # 7

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

Question # 8

The formula of Brackett series can be obtained by putting in the general formula, the value of n equal to:

Question # 9

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

Question # 10

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

Question # 11

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

Question # 12

Balmer series was identified in:

Question # 13

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

Question # 14

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

Question # 15

Graph of Black body radiation is example of

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ECAT Physics Chapter 20 Important MCQ's

Sr.# Question Answer
1 The process of formation of spectrum is called:
A. Interference
B. Spectroscopy
C. Dispersion
D. Reflection
2 Balmer series lies in that region of electromagnetic wave spectrum which is called:
A. Visible region
B. Invisible region
C. Infra-red region
D. ultraviolet region
3 Coulomb multiplied by volt by volt gives the unit called:
A. farad
B. Ohm
C. Second
D. joule
4 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)
5 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)
6 Balmer series was identified in:
A. 1685
B. 1785
C. 1885
D. 1985
7 The natural arrangement of colours in the spectrum of white light spectrum is
A. VIBGYOR
B. ROYBGIV
C. ROYBIGV
D. BIGROYV
8 Tick the series which lies in the visible region:
A. Lyman series
B. Balmer series
C. Paschen series
D. Brackett series
9 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
10 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

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