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

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

Question # 2

Ultraviolet region lies in ______ series

Question # 3

The shell closer to the nucleus is called:

Question # 4

The process of formation of spectrum is called:

Question # 5

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

Question # 6

Tick the series which lies in the visible region:

Question # 7

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

Question # 8

Lyman series in the spectrum of hydrogen exists in the :

Question # 9

Coulomb multiplied by volt by volt gives the unit called:

Question # 10

X-ray are also known as

Question # 11

Balmer series was identified in:

Question # 12

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

Question # 13

Gaussian surface is always:

Question # 14

In case of braking radiations, when the rate of deceleration is very large, the emitted radiation corresponds to:

Question # 15

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

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ECAT Physics Chapter 20 Important MCQ's

Sr.# Question Answer
1 Balmer series was identified in:
A. 1685
B. 1785
C. 1885
D. 1985
2 Photons must have energy equal to
A. ev
B. En
C. hf
D. None of these
3 Ultraviolet region lies in ______ series
A. Layman
B. Balmer
C. P fund
D. B racket
4 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
5 We can excite an atom by
A. Bombardment of particles
B. Radiating photons
C. Providing potential difference
D. All answer are true
6 The value of the metastable state for Neon is
A. 20.66eV
B. 20.61eV
C. 19.23eV
D. 18.70eV
7 The spectrum emitted from hydrogen filled discharge tube is:
A. Line spectrum
B. Discrete spectrum
C. And spectrum
D. Absorption spectrum
8 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)
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 Tick the series which lie/s in. the infra-red region.
A. Pfund series
B. Brackett series
C. Paschen series
D. All of these

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