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 life time of metastable state is equal to

Question # 2

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

Question # 3

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 # 4

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

Question # 5

Tick the series which lie/s in. the infra-red region.

Question # 6

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

Question # 7

Static electricity is produced by the transfer of:

Question # 8

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

Question # 9

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

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

The process of formation of spectrum is called:

Question # 12

The shell closer to the nucleus is called:

Question # 13

Balmer series was identified in:

Question # 14

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

Question # 15

The range of wavelengths of colurs in the visible colours is

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ECAT Physics Chapter 20 Important MCQ's

Sr.# Question Answer
1 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
2 The photocopying process is called:
A. Geography
B. Sonography
C. Xerography
D. Zerography
3 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
4 Tick the series which lies in the visible region:
A. Lyman series
B. Balmer series
C. Paschen series
D. Brackett series
5 Photons must have energy equal to
A. ev
B. En
C. hf
D. None of these
6 The results of spectra obtained by Balmer were expressed in 1896 by:
A.
Bohr
B. Rydberg
C. Planck
D. Rutherford
7 CT scanning is the abbreviated name of
A. Computed Technology
B. Computed Technique
C. Computed Technology
D. Computerized Technique
8 The electric field lines start from:
A. Positive charge
B. Negative charge
C. Either A and B
D. Neutron
9 Braking radiation causes:
A. Continuous spectrum
B. Line Spectrum
C. Band spectrum
D. Discrete specturm
10 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

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