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

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

Question # 2

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

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

Question # 5

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

Question # 6

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

Question # 7

The first shell near the neucles is

Question # 8

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

Question # 9

Balmer series lies in that region of electromagnetic wave spectrum which is called:

Question # 10

The He-Ne laser discharge tube is filled with:

Question # 11

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

Question # 12

The spectrum emitted from hydrogen filled discharge tube is:

Question # 13

Balmer series was identified in:

Question # 14

Photons must have energy equal to

Question # 15

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

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ECAT Physics Chapter 20 Important MCQ's

Sr.# Question Answer
1 Ultraviolet region lies in ______ series
A. Layman
B. Balmer
C. P fund
D. B racket
2 X-ray are also known as
A. Roentgen rays
B. Maxwell rays
C. Plank range
D. Einstein rays
3 If the distance between two charges is doubled,the force between them will become:
A. Double
B. Half
C. One third
D. One fourth
4 The He-Ne laser discharge tube is filled with:
A. 85% He
B. 15% He
C. 50% He
D. 60% He
5 Lyman series in the spectrum of hydrogen exists in the :
A. Infra-red region
B. Visible region
C. Ultraviolet region
D. Both(A) and (B)
6 The results of spectra obtained by Balmer were expressed in 1896 by:
A.
Bohr
B. Rydberg
C. Planck
D. Rutherford
7 The electric field lines start from:
A. Positive charge
B. Negative charge
C. Either A and B
D. Neutron
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 The process of formation of spectrum is called:
A. Interference
B. Spectroscopy
C. Dispersion
D. Reflection
10 In case of braking radiations, when the rate of deceleration is very large, the emitted radiation corresponds to:
A. Short wavelength
B. Large wavelength
C. Very large wavelenth
D. Low frequency

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