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

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

Question # 2

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

Question # 3

The value of the metastable state for Neon is

Question # 4

Balmer series was identified in:

Question # 5

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

Question # 6

Coulomb multiplied by volt by volt gives the unit called:

Question # 7

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

Question # 8

Static electricity is produced by the transfer of:

Question # 9

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

Question # 10

The process of formation of spectrum is called:

Question # 11

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

Question # 12

Selenium is:

Question # 13

X-ray are also known as

Question # 14

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

Question # 15

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

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ECAT Physics Chapter 20 Important MCQ's

Sr.# Question Answer
1 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
2 The holes created in the L and M shells are occupied by transitions of:
A. Electrons from lower states
B. Electrons from higher state
C. Positrons from higher states
D. Electrons from K shell
3 Coulomb multiplied by volt by volt gives the unit called:
A. farad
B. Ohm
C. Second
D. joule
4 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
5 Gaussian surface is always:
A. Rectangular
B. Spherical
C. Cylinder
D. Box shape
6 The He-Ne laser discharge tube is filled with:
A. 85% He
B. 15% He
C. 50% He
D. 60% He
7 Photons must have energy equal to
A. ev
B. En
C. hf
D. None of these
8 The transitions of electrons in the hydrogen atom result in the emission of spectral lies in the:
A. Ultra red region
B. Visible region
C. Ultraviolet region
D. Any of these
9 Tick the series which lies in the visible region:
A. Lyman series
B. Balmer series
C. Paschen series
D. Brackett series
10 Graph of Black body radiation is example of
A. Band spectra
B. Continuo's spectra
C. Line spectra
D. All

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