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

The He-Ne laser discharge tube is filled with:

Question # 2

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

Question # 3

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 # 4

Graph of Black body radiation is example of

Question # 5

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

Question # 6

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

Question # 7

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

Question # 8

Energy required by an electron revolving in certain orbit to jump to an excited state is called:

Question # 9

Gaussian surface is always:

Question # 10

Ultraviolet region lies in ______ series

Question # 11

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

Question # 12

Photons must have energy equal to

Question # 13

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

Question # 14

The photocopying process is called:

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 lasing or active medium in He-Ne laser discharge tube is:
A. Nitrogen
B. Helium
C. Hydrogen
D. Neon
2 Balmer series lies in that region of electromagnetic wave spectrum which is called:
A. Visible region
B. Invisible region
C. Infra-red region
D. ultraviolet region
3 The photocopying process is called:
A. Geography
B. Sonography
C. Xerography
D. Zerography
4 CT scanning is the abbreviated name of
A. Computed Technology
B. Computed Technique
C. Computed Technology
D. Computerized Technique
5 Ultraviolet region lies in ______ series
A. Layman
B. Balmer
C. P fund
D. B racket
6 The spectrum emitted from hydrogen filled discharge tube is:
A. Line spectrum
B. Discrete spectrum
C. And spectrum
D. Absorption spectrum
7 X-ray are also known as
A. Roentgen rays
B. Maxwell rays
C. Plank range
D. Einstein rays
8 The range of wavelengths of colurs in the visible colours is
A. 140 nm to 456 nm
B. 10 nm to 56 nm
C. 410 nm to 656 nm
D. 910 nm to 956 nm
9 Consider a photon of continuous X-ray and a photon of characteristics X-ray of same wavelength. Which of the following is/are different for the two photons
A. Frequency
B. Penetrating power
C. Energy
D. Method of creation
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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