ECAT Pre Computer Science Chapter 20 MCQ Test With Answer

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

Balmer series was identified in:

Question # 2

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

Question # 3

The shell closer to the nucleus is called:

Question # 4

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

Question # 5

The range of wavelengths of colurs in the visible colours is

Question # 6

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

Question # 7

The He-Ne laser discharge tube is filled with:

Question # 8

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

Question # 9

Lyman series in the spectrum of hydrogen exists in the :

Question # 10

A metastable stae:

Question # 11

The first shell near the neucles is

Question # 12

The photocopying process is called:

Question # 13

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

Question # 14

Selenium is:

Question # 15

The value of the metastable state for Neon is

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ECAT Physics Chapter 20 Important MCQ's

Sr.# Question Answer
1 Tick the series which lies in the visible region:
A. Lyman series
B. Balmer series
C. Paschen series
D. Brackett series
2 The minimum wavelength of X-rays produced of 1KV potential difference is applied across the anode and cathode of the tube is
A. 1.24 x 10-10m
B. 7.92 x 10-20m
C. 2.78 x 10-14m
D. 3.88 x 10-11m
3 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
4 The results of spectra obtained by Balmer were expressed in 1896 by:
A.
Bohr
B. Rydberg
C. Planck
D. Rutherford
5 Selenium is:
A. An insulator
B. A conductor
C. Both A and B
D. Excellent conductor
6 Laser is a beam of:
A. Visible light
B. Infra red light
C. Ultra violet light
D. Violet light only
7 Photons must have energy equal to
A. ev
B. En
C. hf
D. None of these
8 Ultraviolet region lies in ______ series
A. Layman
B. Balmer
C. P fund
D. B racket
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 The electric field lines start from:
A. Positive charge
B. Negative charge
C. Either A and B
D. Neutron

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