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

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

Question # 2

We can excite an atom by

Question # 3

Gaussian surface is always:

Question # 4

Static electricity is produced by the transfer of:

Question # 5

In helium Neon Laser Neon = 15% and Helium = 85% used. The lasing gas this unit is

Question # 6

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

Question # 7

In flesh, light element like carbon, hydrogen and oxygen predominate. Three elements allows ______ amount of incident X-ray to pass through them

Question # 8

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

Question # 9

The electric field lines start from:

Question # 10

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

Question # 11

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

Question # 12

CT scanning is the abbreviated name of

Question # 13

The range of wavelengths of colurs in the visible colours is

Question # 14

The process of formation of spectrum is called:

Question # 15

Tick the series which lies in the visible region:

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ECAT Physics Chapter 20 Important MCQ's

Sr.# Question Answer
1 The He-Ne laser discharge tube is filled with:
A. 85% He
B. 15% He
C. 50% He
D. 60% He
2 X-ray are also known as
A. Roentgen rays
B. Maxwell rays
C. Plank range
D. Einstein rays
3 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)
4 The inkjet printer eject a thin stream of:
A. Water
B. Oil
C. Ink
D. Any above
5 Static electricity is produced by the transfer of:
A. Electrons
B. Protons
C. One fluid
D. Two fluid
6 Tick the series which lies in the visible region:
A. Lyman series
B. Balmer series
C. Paschen series
D. Brackett series
7 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)
8 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
9 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
10 Balmer series was identified in:
A. 1685
B. 1785
C. 1885
D. 1985

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