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 photocopying process is called:

Question # 2

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

Question # 3

The first shell near the neucles is

Question # 4

The holes created in the L and M shells are occupied by transitions of:

Question # 5

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

Question # 6

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

Question # 7

The results of spectra obtained by Balmer were expressed in 1896 by:

Question # 8

The inkjet printer eject a thin stream of:

Question # 9

Static electricity is produced by the transfer of:

Question # 10

CT scanning is the abbreviated name of

Question # 11

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

Question # 12

Laser is a beam of:

Question # 13

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

Question # 14

Gaussian surface is always:

Question # 15

The range of wavelengths of colurs in the visible colours is

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ECAT Physics Chapter 20 Important MCQ's

Sr.# Question Answer
1 The process of formation of spectrum is called:
A. Interference
B. Spectroscopy
C. Dispersion
D. Reflection
2 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
3 Balmer series lies in that region of electromagnetic wave spectrum which is called:
A. Visible region
B. Invisible region
C. Infra-red region
D. ultraviolet region
4 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
A. Less than atmospheric pressure
B. Much less than atmospheric pressure
C. Greater than atmospheric pressure
D. Much greater than atmospheric pressure
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 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
7 Coulomb multiplied by volt by volt gives the unit called:
A. farad
B. Ohm
C. Second
D. joule
8 An compared to solid matter, a crack or an air bubble allows:
A. Great amount of X-rays to pass
B. Smallast amount of X-rays to pass
C. Very samall amount of X-rays to pass
D. Any of these
9 Graph of Black body radiation is example of
A. Band spectra
B. Continuo's spectra
C. Line spectra
D. All
10 The results of spectra obtained by Blamer were expressed in 1896 by
A. Bohr
B. Rydberg
C. Planck
D. Rutherford

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