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

00:00
Question # 1

The first series which was identified in the spectrum of hydrogen is called:

Question # 2

Energy required by an electron revolving in certain orbit to jump to an excited state is called:

Question # 3

Tick the series which lies in the visible region:

Question # 4

Balmer series was identified in:

Question # 5

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

Question # 6

A metastable stae:

Question # 7

The electric field lines start from:

Question # 8

We can excite an atom by

Question # 9

The value of the metastable state for Neon is

Question # 10

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

Question # 11

Laser is a beam of:

Question # 12

Graph of Black body radiation is example of

Question # 13

The spectrum emitted from hydrogen filled discharge tube is:

Question # 14

Braking radiation causes:

Question # 15

The photocopying process is called:

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ECAT Physics Chapter 20 Important MCQ's

Sr.# Question Answer
1 Lyman series in the spectrum of hydrogen exists in the :
A. Infra-red region
B. Visible region
C. Ultraviolet region
D. Both(A) and (B)
2 X-ray are also known as
A. Roentgen rays
B. Maxwell rays
C. Plank range
D. Einstein rays
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 electric field lines start from:
A. Positive charge
B. Negative charge
C. Either A and B
D. Neutron
5 The results of spectra obtained by Balmer were expressed in 1896 by:
A.
Bohr
B. Rydberg
C. Planck
D. Rutherford
6 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
7 Photons must have energy equal to
A. ev
B. En
C. hf
D. None of these
8 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
9 The process of formation of spectrum is called:
A. Interference
B. Spectroscopy
C. Dispersion
D. Reflection
10 If the distance between two charges is doubled,the force between them will become:
A. Double
B. Half
C. One third
D. One fourth

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