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

X-ray are also known as

Question # 2

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

Question # 3

The He-Ne laser discharge tube is filled with:

Question # 4

Laser is a beam of:

Question # 5

Braking radiation causes:

Question # 6

Lyman series in the spectrum of hydrogen exists in the :

Question # 7

The process of formation of spectrum is called:

Question # 8

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

Question # 9

Coulomb multiplied by volt by volt gives the unit called:

Question # 10

The electric field lines start from:

Question # 11

Graph of Black body radiation is example of

Question # 12

CT scanning is the abbreviated name of

Question # 13

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

Question # 14

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

Question # 15

Gaussian surface is always:

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ECAT Physics Chapter 20 Important MCQ's

Sr.# Question Answer
1 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
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 Coulomb multiplied by volt by volt gives the unit called:
A. farad
B. Ohm
C. Second
D. joule
4 Graph of Black body radiation is example of
A. Band spectra
B. Continuo's spectra
C. Line spectra
D. All
5 Balmer series was identified in:
A. 1685
B. 1785
C. 1885
D. 1985
6 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)
7 The life time of metastable state is equal to
A. Life time of excited state
B. Greater than by excited state
C. Zero
D. Less than by excited state
8 The first shell near the neucles is
A. L-shell
B. X-shell
C. N-shell
D. M-shell
9 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
10 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

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