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

Lyman series in the spectrum of hydrogen exists in the :

Question # 2

In case of braking radiations, when the rate of deceleration is very large, the emitted radiation corresponds to:

Question # 3

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

Question # 4

Tick the series which lie/s in. the infra-red region.

Question # 5

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

Question # 6

X-ray are also known as

Question # 7

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

Question # 8

The shell closer to the nucleus is called:

Question # 9

Balmer series was identified in:

Question # 10

Laser is a beam of:

Question # 11

Gaussian surface is always:

Question # 12

X-rays produced in a tube operating at 105V. The speed of X-rays produced is

Question # 13

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 # 14

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

Question # 15

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

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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 Graph of Black body radiation is example of
A. Band spectra
B. Continuo's spectra
C. Line spectra
D. All
3 The first shell near the neucles is
A. L-shell
B. X-shell
C. N-shell
D. M-shell
4 Spectrum represents the number of component colours present in certain light in terms of:
A. Wavelength
B. Frequency
C. Energy
D. Both (A) and (B)
5 The process of formation of spectrum is called:
A. Interference
B. Spectroscopy
C. Dispersion
D. Reflection
6 Consider a photon of continuous X-ray and a photon of characteristics X-ray of same wavelength. Which of the following is/are different for the two photons
A. Frequency
B. Penetrating power
C. Energy
D. Method of creation
7 Balmer series was identified in:
A. 1685
B. 1785
C. 1885
D. 1985
8 The He-Ne laser discharge tube is filled with:
A. 85% He
B. 15% He
C. 50% He
D. 60% He
9 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
10 The formula of Brackett series can be obtained by putting in the general formula, the value of n equal to:
A.
one
B. two
C. three
D. four

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