ECAT Pre General Science Physics Chapter 20 MCQ Test With Answer

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

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Question # 1

Photons must have energy equal to

Question # 2

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

Question # 3

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

Question # 4

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

Question # 5

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

Question # 6

Lyman series in the spectrum of hydrogen exists in the :

Question # 7

A metastable stae:

Question # 8

Static electricity is produced by the transfer of:

Question # 9

Balmer series was identified in:

Question # 10

The spectrum emitted from hydrogen filled discharge tube is:

Question # 11

Braking radiation causes:

Question # 12

Ultraviolet region lies in ______ series

Question # 13

Tick the series which lies in the visible region:

Question # 14

The value of the metastable state for Neon is

Question # 15

The shell closer to the nucleus is called:

Question # 16

CT scanning is the abbreviated name of

Question # 17

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

Question # 18

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

Question # 19

Coulomb multiplied by volt by volt gives the unit called:

Question # 20

The range of wavelengths of colurs in the visible colours is

Question # 21

Laser is a beam of:

Question # 22

The He-Ne laser discharge tube is filled with:

Question # 23

Gaussian surface is always:

Question # 24

The first shell near the neucles is

Question # 25

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

Question # 26

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 # 27

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

Question # 28

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

Question # 29

In flesh, light element like carbon, hydrogen and oxygen predominate. Three elements allows ______ amount of incident X-ray to pass through them

Question # 30

Selenium is:

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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 The process of formation of spectrum is called:
A. Interference
B. Spectroscopy
C. Dispersion
D. Reflection
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 We can excite an atom by
A. Bombardment of particles
B. Radiating photons
C. Providing potential difference
D. All answer are true
5 If the distance between two charges is doubled,the force between them will become:
A. Double
B. Half
C. One third
D. One fourth
6 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
7 X-ray are also known as
A. Roentgen rays
B. Maxwell rays
C. Plank range
D. Einstein rays
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 X-rays can penetrate in a solid matte through a distance of several:
A. Kilo metres
B. Metres
C. Centimeters
D. A few angstroms
10 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

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