ECAT Pre Engineering Physics Chapter 20 MCQ Test With Answer

MCQ's Test For Physics ECAT Pre Engineering Chapter 20 Atomic Spectra

Try The MCQ's Test For Physics ECAT Pre Engineering Chapter 20 Atomic Spectra

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Physics ECAT Pre Engineering Chapter 20 Atomic Spectra

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Question # 1

Photons must have energy equal to

Question # 2

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

Question # 3

X-rays can penetrate in a solid matte through a distance of several:

Question # 4

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

Question # 5

Selenium is:

Question # 6

Static electricity is produced by the transfer of:

Question # 7

The photocopying process is called:

Question # 8

Balmer series was identified in:

Question # 9

Tick the series which lies in the visible region:

Question # 10

The spectrum emitted from hydrogen filled discharge tube is:

Question # 11

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

Question # 12

The life time of metastable state is equal to

Question # 13

The range of wavelengths of colurs in the visible colours is

Question # 14

The formula of Brackett series can be obtained by putting in the general formula, the value of n equal to:

Question # 15

The value of the metastable state for Neon is

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ECAT Physics Chapter 20 Important MCQ's

Sr.# Question Answer
1 Laser is a beam of:
A. Visible light
B. Infra red light
C. Ultra violet light
D. Violet light only
2 The results of spectra obtained by Blamer were expressed in 1896 by
A. Bohr
B. Rydberg
C. Planck
D. Rutherford
3 In flesh, light element like carbon, hydrogen and oxygen predominate. Three elements allows ______ amount of incident X-ray to pass through them
A. Small
B. Greater
C. Equal
D. Sometimes
4 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
5 By CAT scans, we can detect the density difference of the order of:
A. 1%
B. 20%
C. 30%
D. 50%
6 Graph of Black body radiation is example of
A. Band spectra
B. Continuo's spectra
C. Line spectra
D. All
7 CT scanning is the abbreviated name of
A. Computed Technology
B. Computed Technique
C. Computed Technology
D. Computerized Technique
8 Tick the series which lies in the visible region:
A. Lyman series
B. Balmer series
C. Paschen series
D. Brackett series
9 We can excite an atom by
A. Bombardment of particles
B. Radiating photons
C. Providing potential difference
D. All answer are true
10 The holes created in the L and M shells are occupied by transitions of:
A. Electrons from lower states
B. Electrons from higher state
C. Positrons from higher states
D. Electrons from K shell

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