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

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

Question # 2

The holes created in the L and M shells are occupied by transitions of:

Question # 3

Coulomb multiplied by volt by volt gives the unit called:

Question # 4

The results of spectra obtained by Blamer were expressed in 1896 by

Question # 5

We can excite an atom by

Question # 6

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

Question # 7

The spectrum emitted from hydrogen filled discharge tube is:

Question # 8

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

Question # 9

The formula of Brackett series can be obtained by putting in the general formula, the value of n equal to:

Question # 10

Laser is a beam of:

Question # 11

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 # 12

X-ray are also known as

Question # 13

Gaussian surface is always:

Question # 14

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

Question # 15

The life time of metastable state is equal to

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ECAT Physics Chapter 20 Important MCQ's

Sr.# Question Answer
1 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
2 The photocopying process is called:
A. Geography
B. Sonography
C. Xerography
D. Zerography
3 Graph of Black body radiation is example of
A. Band spectra
B. Continuo's spectra
C. Line spectra
D. All
4 The spectrum emitted from hydrogen filled discharge tube is:
A. Line spectrum
B. Discrete spectrum
C. And spectrum
D. Absorption spectrum
5 By CAT scans, we can detect the density difference of the order of:
A. 1%
B. 20%
C. 30%
D. 50%
6 Photons must have energy equal to
A. ev
B. En
C. hf
D. None of these
7 An electron of the hydrogen atom in the second orbit is called its:
A. Ground state
B. Excited state
C. Ionized state
D. Any of these
8 The process of formation of spectrum is called:
A. Interference
B. Spectroscopy
C. Dispersion
D. Reflection
9 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
10 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)

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