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

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

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

X-ray are also known as

Question # 5

Ultraviolet region lies in ______ series

Question # 6

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

Question # 7

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

Question # 8

The results of spectra obtained by Blamer were expressed in 1896 by

Question # 9

We can excite an atom by

Question # 10

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

Question # 11

Static electricity is produced by the transfer of:

Question # 12

By CAT scans, we can detect the density difference of the order of:

Question # 13

Lyman series in the spectrum of hydrogen exists in the :

Question # 14

Consider a photon of continuous X-ray and a photon of characteristics X-ray of same wavelength. Which of the following is/are different for the two photons

Question # 15

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

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ECAT Physics Chapter 20 Important MCQ's

Sr.# Question Answer
1 The value of the metastable state for Neon is
A. 20.66eV
B. 20.61eV
C. 19.23eV
D. 18.70eV
2 The lasing or active medium in He-Ne laser discharge tube is:
A. Nitrogen
B. Helium
C. Hydrogen
D. Neon
3 Gaussian surface is always:
A. Rectangular
B. Spherical
C. Cylinder
D. Box shape
4 In case of braking radiations, when the rate of deceleration is very large, the emitted radiation corresponds to:
A. Short wavelength
B. Large wavelength
C. Very large wavelenth
D. Low frequency
5 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
6 Spectrum represents the number of component colours present in certain light in terms of:
A. Wavelength
B. Frequency
C. Energy
D. Both (A) and (B)
7 Graph of Black body radiation is example of
A. Band spectra
B. Continuo's spectra
C. Line spectra
D. All
8 If the distance between two charges is doubled,the force between them will become:
A. Double
B. Half
C. One third
D. One fourth
9 Photons must have energy equal to
A. ev
B. En
C. hf
D. None of these
10 Balmer series was identified in:
A. 1685
B. 1785
C. 1885
D. 1985

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