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

Energy required by an electron revolving in certain orbit to jump to an excited state is called:

Question # 2

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

Question # 3

The life time of metastable state is equal to

Question # 4

The spectrum emitted from hydrogen filled discharge tube is:

Question # 5

Photons must have energy equal to

Question # 6

CT scanning is the abbreviated name of

Question # 7

The range of wavelengths of colurs in the visible colours is

Question # 8

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

Question # 9

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

Question # 10

Lyman series in the spectrum of hydrogen exists in the :

Question # 11

Graph of Black body radiation is example of

Question # 12

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

Question # 13

Selenium is:

Question # 14

Spectrum represents the number of component colours present in certain light in terms of:

Question # 15

Laser is a beam of:

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ECAT Physics Chapter 20 Important MCQ's

Sr.# Question Answer
1 The results of spectra obtained by Balmer were expressed in 1896 by:
A.
Bohr
B. Rydberg
C. Planck
D. Rutherford
2 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
3 The photocopying process is called:
A. Geography
B. Sonography
C. Xerography
D. Zerography
4 Coulomb multiplied by volt by volt gives the unit called:
A. farad
B. Ohm
C. Second
D. joule
5 Photons must have energy equal to
A. ev
B. En
C. hf
D. None of these
6 The electric field lines start from:
A. Positive charge
B. Negative charge
C. Either A and B
D. Neutron
7 The minimum wavelength of X-rays produced of 1KV potential difference is applied across the anode and cathode of the tube is
A. 1.24 x 10-10m
B. 7.92 x 10-20m
C. 2.78 x 10-14m
D. 3.88 x 10-11m
8 Braking radiation causes:
A. Continuous spectrum
B. Line Spectrum
C. Band spectrum
D. Discrete specturm
9 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
10 If the distance between two charges is doubled,the force between them will become:
A. Double
B. Half
C. One third
D. One fourth

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