ECAT Pre Engineering Physics Chapter 20 MCQ Test With Answer

MCQ's Test For Physics ECAT Pre Engineering Chapter 20 Atomic Spectra

Try The MCQ's Test For Physics ECAT Pre Engineering Chapter 20 Atomic Spectra

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Physics ECAT Pre Engineering Chapter 20 Atomic Spectra

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Question # 1

The transitions of electrons in the hydrogen atom result in the emission of spectral lies in the:

Question # 2

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

Question # 3

Ultraviolet region lies in ______ series

Question # 4

Static electricity is produced by the transfer of:

Question # 5

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

Question # 6

X-ray are also known as

Question # 7

The spectrum emitted from hydrogen filled discharge tube is:

Question # 8

In flesh, light element like carbon, hydrogen and oxygen predominate. Three elements allows ______ amount of incident X-ray to pass through them

Question # 9

We can excite an atom by

Question # 10

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

Question # 11

A metastable stae:

Question # 12

Graph of Black body radiation is example of

Question # 13

The inkjet printer eject a thin stream of:

Question # 14

Photons must have energy equal to

Question # 15

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

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ECAT Physics Chapter 20 Important MCQ's

Sr.# Question Answer
1 The holes created in the L and M shells are occupied by transitions of:
A. Electrons from lower states
B. Electrons from higher state
C. Positrons from higher states
D. Electrons from K shell
2 The spectrum emitted from hydrogen filled discharge tube is:
A. Line spectrum
B. Discrete spectrum
C. And spectrum
D. Absorption spectrum
3 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)
4 Ultraviolet region lies in ______ series
A. Layman
B. Balmer
C. P fund
D. B racket
5 A metastable stae:
A. Is an excited state
B. Is that in which excited electron is stable
C. Is that in which excited electron is usually unstable
D. Means a time interval of 10-8second
6 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
7 Braking radiation causes:
A. Continuous spectrum
B. Line Spectrum
C. Band spectrum
D. Discrete specturm
8 The electric field lines start from:
A. Positive charge
B. Negative charge
C. Either A and B
D. Neutron
9 The He-Ne laser discharge tube is filled with:
A. 85% He
B. 15% He
C. 50% He
D. 60% He
10 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

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