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

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Question # 1

Tick the series which lies in the visible region:

Question # 2

Balmer series was identified in:

Question # 3

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

Question # 4

The He-Ne laser discharge tube is filled with:

Question # 5

The inkjet printer eject a thin stream of:

Question # 6

X-ray are also known as

Question # 7

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

Question # 8

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

Question # 9

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

Question # 10

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

Question # 11

Braking radiation causes:

Question # 12

The photocopying process is called:

Question # 13

We can excite an atom by

Question # 14

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

Question # 15

The process of formation of spectrum is called:

Question # 16

The range of wavelengths of colurs in the visible colours is

Question # 17

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

Question # 18

CT scanning is the abbreviated name of

Question # 19

Gaussian surface is always:

Question # 20

Lyman series in the spectrum of hydrogen exists in the :

Question # 21

Selenium is:

Question # 22

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 # 23

The value of the metastable state for Neon is

Question # 24

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

Question # 25

Ultraviolet region lies in ______ series

Question # 26

Coulomb multiplied by volt by volt gives the unit called:

Question # 27

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

Question # 28

The spectrum emitted from hydrogen filled discharge tube is:

Question # 29

The shell closer to the nucleus is called:

Question # 30

The life time of metastable state is equal to

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ECAT Physics Chapter 20 Important MCQ's

Sr.# Question Answer
1 X-rays can penetrate in a solid matte through a distance of several:
A. Kilo metres
B. Metres
C. Centimeters
D. A few angstroms
2 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
3 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
4 The electric field lines start from:
A. Positive charge
B. Negative charge
C. Either A and B
D. Neutron
5 Graph of Black body radiation is example of
A. Band spectra
B. Continuo's spectra
C. Line spectra
D. All
6 The process of formation of spectrum is called:
A. Interference
B. Spectroscopy
C. Dispersion
D. Reflection
7 By CAT scans, we can detect the density difference of the order of:
A. 1%
B. 20%
C. 30%
D. 50%
8 We can excite an atom by
A. Bombardment of particles
B. Radiating photons
C. Providing potential difference
D. All answer are true
9 Ultraviolet region lies in ______ series
A. Layman
B. Balmer
C. P fund
D. B racket
10 X-ray are also known as
A. Roentgen rays
B. Maxwell rays
C. Plank range
D. Einstein rays

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