ECAT Pre Computer Science Chapter 20 MCQ Test With Answer

MCQ's Test For ECAT Physics Chapter 20 Atomic Spectra

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

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ECAT Physics Chapter 20 Atomic Spectra

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Question # 1

Photons must have energy equal to

Question # 2

CT scanning is the abbreviated name of

Question # 3

Coulomb multiplied by volt by volt gives the unit called:

Question # 4

The spectrum emitted from hydrogen filled discharge tube is:

Question # 5

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

Question # 6

The He-Ne laser discharge tube is filled with:

Question # 7

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

Question # 8

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

Question # 9

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

Question # 10

Static electricity is produced by the transfer of:

Question # 11

The life time of metastable state is equal to

Question # 12

Laser is a beam of:

Question # 13

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

Question # 14

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

Question # 15

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

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ECAT Physics Chapter 20 Important MCQ's

Sr.# Question Answer
1 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
2 The lasing or active medium in He-Ne laser discharge tube is:
A. Nitrogen
B. Helium
C. Hydrogen
D. Neon
3 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
4 The shell closer to the nucleus is called:
A. N shell
B.
L shell
C. K shell
D. M shell
5 Static electricity is produced by the transfer of:
A. Electrons
B. Protons
C. One fluid
D. Two fluid
6 An electron of the hydrogen atom in the second orbit is called its:
A. Ground state
B. Excited state
C. Ionized state
D. Any of these
7 The value of the metastable state for Neon is
A. 20.66eV
B. 20.61eV
C. 19.23eV
D. 18.70eV
8 X-rays can penetrate in a solid matte through a distance of several:
A. Kilo metres
B. Metres
C. Centimeters
D. A few angstroms
9 Selenium is:
A. An insulator
B. A conductor
C. Both A and B
D. Excellent conductor
10 We can excite an atom by
A. Bombardment of particles
B. Radiating photons
C. Providing potential difference
D. All answer are true

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