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

Balmer series lies in that region of electromagnetic wave spectrum which is called:

Question # 2

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

Question # 3

A metastable stae:

Question # 4

Braking radiation causes:

Question # 5

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

Question # 6

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

Question # 7

Balmer series was identified in:

Question # 8

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

Question # 9

The shell closer to the nucleus is called:

Question # 10

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

Question # 11

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

Question # 12

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

Question # 13

The life time of metastable state is equal to

Question # 14

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

Question # 15

Gaussian surface is always:

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ECAT Physics Chapter 20 Important MCQ's

Sr.# Question Answer
1 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
2 The value of the metastable state for Neon is
A. 20.66eV
B. 20.61eV
C. 19.23eV
D. 18.70eV
3 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)
4 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
A. Less than atmospheric pressure
B. Much less than atmospheric pressure
C. Greater than atmospheric pressure
D. Much greater than atmospheric pressure
5 Tick the series which lies in the visible region:
A. Lyman series
B. Balmer series
C. Paschen series
D. Brackett series
6 Laser is a beam of:
A. Visible light
B. Infra red light
C. Ultra violet light
D. Violet light only
7 The first shell near the neucles is
A. L-shell
B. X-shell
C. N-shell
D. M-shell
8 Graph of Black body radiation is example of
A. Band spectra
B. Continuo's spectra
C. Line spectra
D. All
9 X-ray are also known as
A. Roentgen rays
B. Maxwell rays
C. Plank range
D. Einstein rays
10 The inkjet printer eject a thin stream of:
A. Water
B. Oil
C. Ink
D. Any above

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  • Salmankhan

    Salmankhan

    01 Feb 2018

    Some mcqs having wrong answers.

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