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

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

Question # 2

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

Question # 3

The holes created in the L and M shells are occupied by transitions of:

Question # 4

Braking radiation causes:

Question # 5

Selenium is:

Question # 6

A metastable stae:

Question # 7

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

Question # 8

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

Question # 9

The value of the metastable state for Neon is

Question # 10

The life time of metastable state is equal to

Question # 11

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

Question # 12

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

Question # 13

The spectrum emitted from hydrogen filled discharge tube is:

Question # 14

The inkjet printer eject a thin stream of:

Question # 15

Laser is a beam of:

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ECAT Physics Chapter 20 Important MCQ's

Sr.# Question Answer
1 Static electricity is produced by the transfer of:
A. Electrons
B. Protons
C. One fluid
D. Two fluid
2 The lasing or active medium in He-Ne laser discharge tube is:
A. Nitrogen
B. Helium
C. Hydrogen
D. Neon
3 The results of spectra obtained by Blamer were expressed in 1896 by
A. Bohr
B. Rydberg
C. Planck
D. Rutherford
4 X-ray are also known as
A. Roentgen rays
B. Maxwell rays
C. Plank range
D. Einstein rays
5 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
6 A metastable stae:
A. Is an excited state
B. Is that in which excited electron is stable
C. Is that in which excited electron is usually unstable
D. Means a time interval of 10-8second
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 The electric field lines start from:
A. Positive charge
B. Negative charge
C. Either A and B
D. Neutron
9 Photons must have energy equal to
A. ev
B. En
C. hf
D. None of these
10 Laser is a beam of:
A. Visible light
B. Infra red light
C. Ultra violet light
D. Violet light only

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