ECAT Pre General Science Physics Chapter 20 MCQ Test With Answer

MCQ's Test For ECAT Pre General Science Physics Chapter 20 Atomic Spectra

Try The MCQ's Test For ECAT Pre General Science Physics Chapter 20 Atomic Spectra

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ECAT Pre General Science Physics Chapter 20 Atomic Spectra

00:00
Question # 1

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

Question # 2

Graph of Black body radiation is example of

Question # 3

Ultraviolet region lies in ______ series

Question # 4

The transitions of electrons in the hydrogen atom result in the emission of spectral lies in the:

Question # 5

Laser is a beam of:

Question # 6

The shell closer to the nucleus is called:

Question # 7

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

Question # 8

The spectrum emitted from hydrogen filled discharge tube is:

Question # 9

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

Question # 10

Balmer series was identified in:

Question # 11

Braking radiation causes:

Question # 12

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

Question # 13

Selenium is:

Question # 14

The process of formation of spectrum is called:

Question # 15

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

Question # 16

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 # 17

The first shell near the neucles is

Question # 18

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

Question # 19

Static electricity is produced by the transfer of:

Question # 20

The inkjet printer eject a thin stream of:

Question # 21

The electric field lines start from:

Question # 22

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

Question # 23

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

Question # 24

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

Question # 25

X-ray are also known as

Question # 26

The life time of metastable state is equal to

Question # 27

We can excite an atom by

Question # 28

Spectrum represents the number of component colours present in certain light in terms of:

Question # 29

Lyman series in the spectrum of hydrogen exists in the :

Question # 30

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

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ECAT Physics Chapter 20 Important MCQ's

Sr.# Question Answer
1 The electric field lines start from:
A. Positive charge
B. Negative charge
C. Either A and B
D. Neutron
2 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
3 Tick the series which lie/s in. the infra-red region.
A. Pfund series
B. Brackett series
C. Paschen series
D. All of these
4 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
5 CT scanning is the abbreviated name of
A. Computed Technology
B. Computed Technique
C. Computed Technology
D. Computerized Technique
6 Energy required by an electron revolving in certain orbit to jump to an excited state is called:
A. Ionization energy
B. Ionization potential
C. Excitation energy
D. Excitation potential
7 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
8 Braking radiation causes:
A. Continuous spectrum
B. Line Spectrum
C. Band spectrum
D. Discrete specturm
9 Photons must have energy equal to
A. ev
B. En
C. hf
D. None of these
10 The first series which was identified in the spectrum of hydrogen is called:
A. Lyman series
B. Balmer series
C. Paschen series
D. Brackett series

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