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

Laser is a beam of:

Question # 2

CT scanning is the abbreviated name of

Question # 3

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

Question # 4

The He-Ne laser discharge tube is filled with:

Question # 5

Graph of Black body radiation is example of

Question # 6

The spectrum emitted from hydrogen filled discharge tube is:

Question # 7

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

Question # 8

The electric field lines start from:

Question # 9

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

Question # 10

The process of formation of spectrum is called:

Question # 11

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

Question # 12

Coulomb multiplied by volt by volt gives the unit called:

Question # 13

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

Question # 14

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

Question # 15

Lyman series in the spectrum of hydrogen exists in the :

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ECAT Physics Chapter 20 Important MCQ's

Sr.# Question Answer
1 CT scanning is the abbreviated name of
A. Computed Technology
B. Computed Technique
C. Computed Technology
D. Computerized Technique
2 X-ray are also known as
A. Roentgen rays
B. Maxwell rays
C. Plank range
D. Einstein rays
3 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
4 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
5 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)
6 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
7 Photons must have energy equal to
A. ev
B. En
C. hf
D. None of these
8 Balmer series was identified in:
A. 1685
B. 1785
C. 1885
D. 1985
9 Gaussian surface is always:
A. Rectangular
B. Spherical
C. Cylinder
D. Box shape
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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