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 inkjet printer eject a thin stream of:

Question # 2

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

Question # 3

An compared to solid matter, a crack or an air bubble allows:

Question # 4

Tick the series which lies in the visible region:

Question # 5

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

Question # 6

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

Question # 7

Gaussian surface is always:

Question # 8

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

Question # 9

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

Question # 10

Selenium is:

Question # 11

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

Question # 12

The photocopying process is called:

Question # 13

The first shell near the neucles is

Question # 14

Laser is a beam of:

Question # 15

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

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ECAT Physics Chapter 20 Important MCQ's

Sr.# Question Answer
1 Tick the series which lie/s in. the infra-red region.
A. Pfund series
B. Brackett series
C. Paschen series
D. All of these
2 Tick the series which lies in the visible region:
A. Lyman series
B. Balmer series
C. Paschen series
D. Brackett series
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 In helium Neon Laser Neon = 15% and Helium = 85% used. The lasing gas this unit is
A. Helium
B. Neon
C. Both
D. None of these
5 An electron of the hydrogen atom in the second orbit is called its:
A. Ground state
B. Excited state
C. Ionized state
D. Any of these
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 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
8 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)
9 The minimum wavelength of X-rays produced of 1KV potential difference is applied across the anode and cathode of the tube is
A. 1.24 x 10-10m
B. 7.92 x 10-20m
C. 2.78 x 10-14m
D. 3.88 x 10-11m
10 The He-Ne laser discharge tube is filled with:
A. 85% He
B. 15% He
C. 50% He
D. 60% He

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