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

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

Question # 2

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

Question # 3

The value of the metastable state for Neon is

Question # 4

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

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 spectrum emitted from hydrogen filled discharge tube is:

Question # 7

The photocopying process is called:

Question # 8

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

Question # 9

Balmer series was identified in:

Question # 10

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

Question # 11

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

Question # 12

The process of formation of spectrum is called:

Question # 13

Static electricity is produced by the transfer of:

Question # 14

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

Question # 15

CT scanning is the abbreviated name of

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ECAT Physics Chapter 20 Important MCQ's

Sr.# Question Answer
1 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)
2 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
3 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
4 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
5 The electric field lines start from:
A. Positive charge
B. Negative charge
C. Either A and B
D. Neutron
6 If the distance between two charges is doubled,the force between them will become:
A. Double
B. Half
C. One third
D. One fourth
7 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
8 The lasing or active medium in He-Ne laser discharge tube is:
A. Nitrogen
B. Helium
C. Hydrogen
D. Neon
9 Selenium is:
A. An insulator
B. A conductor
C. Both A and B
D. Excellent conductor
10 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

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