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

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

Question # 2

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

Question # 3

The life time of metastable state is equal to

Question # 4

X-rays can penetrate in a solid matte through a distance of several:

Question # 5

X-rays produced in a tube operating at 105V. The speed of X-rays produced is

Question # 6

Lyman series in the spectrum of hydrogen exists in the :

Question # 7

The electric field lines start from:

Question # 8

Coulomb multiplied by volt by volt gives the unit called:

Question # 9

The range of wavelengths of colurs in the visible colours is

Question # 10

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

Question # 11

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

Question # 12

Ultraviolet region lies in ______ series

Question # 13

We can excite an atom by

Question # 14

X-ray are also known as

Question # 15

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

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ECAT Physics Chapter 20 Important MCQ's

Sr.# Question Answer
1 Static electricity is produced by the transfer of:
A. Electrons
B. Protons
C. One fluid
D. Two fluid
2 Graph of Black body radiation is example of
A. Band spectra
B. Continuo's spectra
C. Line spectra
D. All
3 The formula of Brackett series can be obtained by putting in the general formula, the value of n equal to:
A.
one
B. two
C. three
D. four
4 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
5 Ultraviolet region lies in ______ series
A. Layman
B. Balmer
C. P fund
D. B racket
6 In flesh, light element like carbon, hydrogen and oxygen predominate. Three elements allows ______ amount of incident X-ray to pass through them
A. Small
B. Greater
C. Equal
D. Sometimes
7 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
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 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)
10 The lasing or active medium in He-Ne laser discharge tube is:
A. Nitrogen
B. Helium
C. Hydrogen
D. Neon

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