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

Gaussian surface is always:

Question # 2

Braking radiation causes:

Question # 3

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

Question # 4

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

Question # 5

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

Question # 6

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

Question # 7

The value of the metastable state for Neon is

Question # 8

Lyman series in the spectrum of hydrogen exists in the :

Question # 9

The range of wavelengths of colurs in the visible colours is

Question # 10

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

Question # 11

Balmer series lies in that region of electromagnetic wave spectrum which is called:

Question # 12

The life time of metastable state is equal to

Question # 13

Graph of Black body radiation is example of

Question # 14

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

Question # 15

X-ray are also known as

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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 Braking radiation causes:
A. Continuous spectrum
B. Line Spectrum
C. Band spectrum
D. Discrete specturm
3 An compared to solid matter, a crack or an air bubble allows:
A. Great amount of X-rays to pass
B. Smallast amount of X-rays to pass
C. Very samall amount of X-rays to pass
D. Any of these
4 The electric field lines start from:
A. Positive charge
B. Negative charge
C. Either A and B
D. Neutron
5 Selenium is:
A. An insulator
B. A conductor
C. Both A and B
D. Excellent conductor
6 If the distance between two charges is doubled,the force between them will become:
A. Double
B. Half
C. One third
D. One fourth
7 Tick the series which lies in the visible region:
A. Lyman series
B. Balmer series
C. Paschen series
D. Brackett series
8 The transitions of electrons in the hydrogen atom result in the emission of spectral lies in the:
A. Ultra red region
B. Visible region
C. Ultraviolet region
D. Any of these
9 X-rays produced in a tube operating at 105V. The speed of X-rays produced is
A. 3 x 108m/s
B. 3.1 x 108m/s
C. 2.8 x 108m/s
D. 1.88 x 108m/s
10 By CAT scans, we can detect the density difference of the order of:
A. 1%
B. 20%
C. 30%
D. 50%

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  • Salmankhan

    Salmankhan

    01 Feb 2018

    Some mcqs having wrong answers.

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