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 first series which was identified in the spectrum of hydrogen is called:

Question # 2

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

Question # 3

The range of wavelengths of colurs in the visible colours is

Question # 4

Graph of Black body radiation is example of

Question # 5

Ultraviolet region lies in ______ series

Question # 6

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

Question # 7

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

Question # 8

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

Question # 9

In helium Neon Laser Neon = 15% and Helium = 85% used. The lasing gas this unit is

Question # 10

The process of formation of spectrum is called:

Question # 11

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

Question # 12

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

Question # 13

Photons must have energy equal to

Question # 14

The spectrum emitted from hydrogen filled discharge tube is:

Question # 15

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

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ECAT Physics Chapter 20 Important MCQ's

Sr.# Question Answer
1 If the distance between two charges is doubled,the force between them will become:
A. Double
B. Half
C. One third
D. One fourth
2 Graph of Black body radiation is example of
A. Band spectra
B. Continuo's spectra
C. Line spectra
D. All
3 The value of the metastable state for Neon is
A. 20.66eV
B. 20.61eV
C. 19.23eV
D. 18.70eV
4 The process of formation of spectrum is called:
A. Interference
B. Spectroscopy
C. Dispersion
D. Reflection
5 Gaussian surface is always:
A. Rectangular
B. Spherical
C. Cylinder
D. Box shape
6 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
7 Balmer series was identified in:
A. 1685
B. 1785
C. 1885
D. 1985
8 The inkjet printer eject a thin stream of:
A. Water
B. Oil
C. Ink
D. Any above
9 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
10 Photons must have energy equal to
A. ev
B. En
C. hf
D. None of these

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