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

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

Question # 2

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

Question # 3

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

Question # 4

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

Question # 5

The first shell near the neucles is

Question # 6

The value of the metastable state for Neon is

Question # 7

CT scanning is the abbreviated name of

Question # 8

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

Question # 9

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

Question # 10

Graph of Black body radiation is example of

Question # 11

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

Question # 12

The process of formation of spectrum is called:

Question # 13

By CAT scans, we can detect the density difference of the order of:

Question # 14

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

Question # 15

Laser is a beam of:

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ECAT Physics Chapter 20 Important MCQ's

Sr.# Question Answer
1 Balmer series was identified in:
A. 1685
B. 1785
C. 1885
D. 1985
2 Static electricity is produced by the transfer of:
A. Electrons
B. Protons
C. One fluid
D. Two fluid
3 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
4 Gaussian surface is always:
A. Rectangular
B. Spherical
C. Cylinder
D. Box shape
5 The electric field lines start from:
A. Positive charge
B. Negative charge
C. Either A and B
D. Neutron
6 X-rays produced in a tube operating at 105V. The speed of X-rays produced is
A. 3 x 108m/s
B. 3.1 x 108m/s
C. 2.8 x 108m/s
D. 1.88 x 108m/s
7 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
8 Photons must have energy equal to
A. ev
B. En
C. hf
D. None of these
9 Laser is a beam of:
A. Visible light
B. Infra red light
C. Ultra violet light
D. Violet light only
10 Braking radiation causes:
A. Continuous spectrum
B. Line Spectrum
C. Band spectrum
D. Discrete specturm

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