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

A metastable stae:

Question # 2

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

Question # 3

The minimum wavelength of X-rays produced of 1KV potential difference is applied across the anode and cathode of the tube is

Question # 4

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

Question # 5

Braking radiation causes:

Question # 6

The range of wavelengths of colurs in the visible colours is

Question # 7

Balmer series was identified in:

Question # 8

Lyman series in the spectrum of hydrogen exists in the :

Question # 9

X-ray are also known as

Question # 10

Static electricity is produced by the transfer of:

Question # 11

The electric field lines start from:

Question # 12

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

Question # 13

The first shell near the neucles is

Question # 14

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

Question # 15

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

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ECAT Physics Chapter 20 Important MCQ's

Sr.# Question Answer
1 The process of formation of spectrum is called:
A. Interference
B. Spectroscopy
C. Dispersion
D. Reflection
2 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
3 The life time of metastable state is equal to
A. Life time of excited state
B. Greater than by excited state
C. Zero
D. Less than by excited state
4 X-ray are also known as
A. Roentgen rays
B. Maxwell rays
C. Plank range
D. Einstein rays
5 Static electricity is produced by the transfer of:
A. Electrons
B. Protons
C. One fluid
D. Two fluid
6 Gaussian surface is always:
A. Rectangular
B. Spherical
C. Cylinder
D. Box shape
7 The spectrum emitted from hydrogen filled discharge tube is:
A. Line spectrum
B. Discrete spectrum
C. And spectrum
D. Absorption spectrum
8 The shell closer to the nucleus is called:
A. N shell
B.
L shell
C. K shell
D. M shell
9 The results of spectra obtained by Balmer were expressed in 1896 by:
A.
Bohr
B. Rydberg
C. Planck
D. Rutherford
10 The electric field lines start from:
A. Positive charge
B. Negative charge
C. Either A and B
D. Neutron

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