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

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

Tick the series which lies in the visible region:

Question # 4

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

Question # 5

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

Question # 6

Graph of Black body radiation is example of

Question # 7

In flesh, light element like carbon, hydrogen and oxygen predominate. Three elements allows ______ amount of incident X-ray to pass through them

Question # 8

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

Question # 9

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

Question # 10

Braking radiation causes:

Question # 11

The electric field lines start from:

Question # 12

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

Question # 13

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

Question # 14

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

Question # 15

In case of braking radiations, when the rate of deceleration is very large, the emitted radiation corresponds to:

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ECAT Physics Chapter 20 Important MCQ's

Sr.# Question Answer
1 The transitions of electrons in the hydrogen atom result in the emission of spectral lies in the:
A. Ultra red region
B. Visible region
C. Ultraviolet region
D. Any of these
2 The results of spectra obtained by Blamer were expressed in 1896 by
A. Bohr
B. Rydberg
C. Planck
D. Rutherford
3 The lasing or active medium in He-Ne laser discharge tube is:
A. Nitrogen
B. Helium
C. Hydrogen
D. Neon
4 Energy required by an electron revolving in certain orbit to jump to an excited state is called:
A. Ionization energy
B. Ionization potential
C. Excitation energy
D. Excitation potential
5 Selenium is:
A. An insulator
B. A conductor
C. Both A and B
D. Excellent conductor
6 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
7 Tick the series which lies in the visible region:
A. Lyman series
B. Balmer series
C. Paschen series
D. Brackett series
8 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
9 The spectrum emitted from hydrogen filled discharge tube is:
A. Line spectrum
B. Discrete spectrum
C. And spectrum
D. Absorption spectrum
10 Braking radiation causes:
A. Continuous spectrum
B. Line Spectrum
C. Band spectrum
D. Discrete specturm

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