ECAT Pre Computer Science Chapter 20 MCQ Test With Answer

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

Tick the series which lies in the visible region:

Question # 2

Gaussian surface is always:

Question # 3

The electric field lines start from:

Question # 4

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

Question # 5

The value of the metastable state for Neon is

Question # 6

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

Question # 7

Coulomb multiplied by volt by volt gives the unit called:

Question # 8

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

Question # 9

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

Question # 10

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

Question # 11

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

Question # 12

Ultraviolet region lies in ______ series

Question # 13

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

Question # 14

Lyman series in the spectrum of hydrogen exists in the :

Question # 15

We can excite an atom by

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ECAT Physics Chapter 20 Important MCQ's

Sr.# Question Answer
1 In case of braking radiations, when the rate of deceleration is very large, the emitted radiation corresponds to:
A. Short wavelength
B. Large wavelength
C. Very large wavelenth
D. Low frequency
2 Tick the series which lie/s in. the infra-red region.
A. Pfund series
B. Brackett series
C. Paschen series
D. All of these
3 We can excite an atom by
A. Bombardment of particles
B. Radiating photons
C. Providing potential difference
D. All answer are true
4 The shell closer to the nucleus is called:
A. N shell
B.
L shell
C. K shell
D. M shell
5 Photons must have energy equal to
A. ev
B. En
C. hf
D. None of these
6 Static electricity is produced by the transfer of:
A. Electrons
B. Protons
C. One fluid
D. Two fluid
7 The life time of metastable state is equal to
A. Life time of excited state
B. Greater than by excited state
C. Zero
D. Less than by excited state
8 The lasing or active medium in He-Ne laser discharge tube is:
A. Nitrogen
B. Helium
C. Hydrogen
D. Neon
9 Gaussian surface is always:
A. Rectangular
B. Spherical
C. Cylinder
D. Box shape
10 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

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