ECAT Pre Engineering Physics Chapter 20 MCQ Test With Answer

MCQ's Test For Physics ECAT Pre Engineering Chapter 20 Atomic Spectra

Try The MCQ's Test For Physics ECAT Pre Engineering Chapter 20 Atomic Spectra

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Physics ECAT Pre Engineering Chapter 20 Atomic Spectra

00:00
Question # 1

The shell closer to the nucleus is called:

Question # 2

A metastable stae:

Question # 3

The He-Ne laser discharge tube is filled with:

Question # 4

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

Question # 5

Coulomb multiplied by volt by volt gives the unit called:

Question # 6

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

Question # 7

The inkjet printer eject a thin stream 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 first series which was identified in the spectrum of hydrogen is called:

Question # 10

Laser is a beam of:

Question # 11

The electric field lines start from:

Question # 12

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

Question # 13

Gaussian surface is always:

Question # 14

Balmer series was identified in:

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 The first shell near the neucles is
A. L-shell
B. X-shell
C. N-shell
D. M-shell
2 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
3 Tick the series which lie/s in. the infra-red region.
A. Pfund series
B. Brackett series
C. Paschen series
D. All of these
4 Static electricity is produced by the transfer of:
A. Electrons
B. Protons
C. One fluid
D. Two fluid
5 X-rays produced in a tube operating at 105V. The speed of X-rays produced is
A. 3 x 108m/s
B. 3.1 x 108m/s
C. 2.8 x 108m/s
D. 1.88 x 108m/s
6 The photocopying process is called:
A. Geography
B. Sonography
C. Xerography
D. Zerography
7 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)
8 Energy required by an electron revolving in certain orbit to jump to an excited state is called:
A. Ionization energy
B. Ionization potential
C. Excitation energy
D. Excitation potential
9 The first series which was identified in the spectrum of hydrogen is called:
A. Lyman series
B. Balmer series
C. Paschen series
D. Brackett series
10 Photons must have energy equal to
A. ev
B. En
C. hf
D. None of these

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  • Salmankhan

    Salmankhan

    01 Feb 2018

    Some mcqs having wrong answers.

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