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

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

Question # 2

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

Question # 3

Graph of Black body radiation is example of

Question # 4

The shell closer to the nucleus is called:

Question # 5

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

Question # 6

Gaussian surface is always:

Question # 7

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 # 8

Laser is a beam of:

Question # 9

Coulomb multiplied by volt by volt gives the unit called:

Question # 10

X-rays produced in a tube operating at 105V. The speed of X-rays produced is

Question # 11

The life time of metastable state is equal to

Question # 12

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

Question # 13

We can excite an atom by

Question # 14

By CAT scans, we can detect the density difference of the order of:

Question # 15

Tick the series which lies in the visible region:

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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 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
3 The results of spectra obtained by Balmer were expressed in 1896 by:
A.
Bohr
B. Rydberg
C. Planck
D. Rutherford
4 Selenium is:
A. An insulator
B. A conductor
C. Both A and B
D. Excellent conductor
5 X-rays can penetrate in a solid matte through a distance of several:
A. Kilo metres
B. Metres
C. Centimeters
D. A few angstroms
6 The formula of Brackett series can be obtained by putting in the general formula, the value of n equal to:
A.
one
B. two
C. three
D. four
7 Photons must have energy equal to
A. ev
B. En
C. hf
D. None of these
8 The He-Ne laser discharge tube is filled with:
A. 85% He
B. 15% He
C. 50% He
D. 60% He
9 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
10 X-ray are also known as
A. Roentgen rays
B. Maxwell rays
C. Plank range
D. Einstein rays

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