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

An electron of the hydrogen atom in the second orbit is called its:

Question # 2

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

Question # 3

Selenium is:

Question # 4

The life time of metastable state is equal to

Question # 5

The He-Ne laser discharge tube is filled with:

Question # 6

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

Question # 7

Balmer series was identified in:

Question # 8

In case of braking radiations, when the rate of deceleration is very large, the emitted radiation corresponds to:

Question # 9

The electric field lines start from:

Question # 10

Gaussian surface is always:

Question # 11

The inkjet printer eject a thin stream of:

Question # 12

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

Question # 13

Tick the series which lies in the visible region:

Question # 14

The value of the metastable state for Neon is

Question # 15

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

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ECAT Physics Chapter 20 Important MCQ's

Sr.# Question Answer
1 The results of spectra obtained by Blamer were expressed in 1896 by
A. Bohr
B. Rydberg
C. Planck
D. Rutherford
2 The transitions of electrons in the hydrogen atom result in the emission of spectral lies in the:
A. Ultra red region
B. Visible region
C. Ultraviolet region
D. Any of these
3 If the distance between two charges is doubled,the force between them will become:
A. Double
B. Half
C. One third
D. One fourth
4 Tick the series which lie/s in. the infra-red region.
A. Pfund series
B. Brackett series
C. Paschen series
D. All of these
5 Graph of Black body radiation is example of
A. Band spectra
B. Continuo's spectra
C. Line spectra
D. All
6 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
7 The process of formation of spectrum is called:
A. Interference
B. Spectroscopy
C. Dispersion
D. Reflection
8 Gaussian surface is always:
A. Rectangular
B. Spherical
C. Cylinder
D. Box shape
9 X-ray are also known as
A. Roentgen rays
B. Maxwell rays
C. Plank range
D. Einstein rays
10 Photons must have energy equal to
A. ev
B. En
C. hf
D. None of these

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