ECAT Pre Engineering Physics Chapter 20 MCQ Test With Answer

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

X-ray are also known as

Question # 2

The minimum wavelength of X-rays produced of 1KV potential difference is applied across the anode and cathode of the tube is

Question # 3

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

Question # 4

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

Question # 5

Static electricity is produced by the transfer of:

Question # 6

Tick the series which lies in the visible region:

Question # 7

CT scanning is the abbreviated name of

Question # 8

We can excite an atom by

Question # 9

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

Question # 10

The value of the metastable state for Neon is

Question # 11

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

Question # 12

The natural arrangement of colours in the spectrum of white light spectrum is

Question # 13

Gaussian surface is always:

Question # 14

The range of wavelengths of colurs in the visible colours is

Question # 15

The process of formation of spectrum is called:

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ECAT Physics Chapter 20 Important MCQ's

Sr.# Question Answer
1 The lasing or active medium in He-Ne laser discharge tube is:
A. Nitrogen
B. Helium
C. Hydrogen
D. Neon
2 Gaussian surface is always:
A. Rectangular
B. Spherical
C. Cylinder
D. Box shape
3 The spectrum emitted from hydrogen filled discharge tube is:
A. Line spectrum
B. Discrete spectrum
C. And spectrum
D. Absorption spectrum
4 Coulomb multiplied by volt by volt gives the unit called:
A. farad
B. Ohm
C. Second
D. joule
5 By CAT scans, we can detect the density difference of the order of:
A. 1%
B. 20%
C. 30%
D. 50%
6 The shell closer to the nucleus is called:
A. N shell
B.
L shell
C. K shell
D. M shell
7 Selenium is:
A. An insulator
B. A conductor
C. Both A and B
D. Excellent conductor
8 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
A. Less than atmospheric pressure
B. Much less than atmospheric pressure
C. Greater than atmospheric pressure
D. Much greater than atmospheric pressure
9 The results of spectra obtained by Balmer were expressed in 1896 by:
A.
Bohr
B. Rydberg
C. Planck
D. Rutherford
10 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

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