Second Year Physics Chapter 20 Online MCQ Test for 2nd Year Physics Chapter 20 Atomic Spectra Preparation

FSC Part 2 Physics
Chapter 20 Test

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Physics FSC Part 2 Chapter 20 Online MCQ's Test

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Question # 1

In Helium Neon laser, discharge tube is filled with Neon gas.

Question # 2

Hydrogen atom spectrum does not lie in

Question # 3

The idea of laser device was first introduced by C.H. Towners and Authers Schowlan is

Question # 4

Laser is a beam of light which is

Question # 5

Production of x rays is reverse process of

Question # 6

The value of Rydberg constant is

Question # 7

The energy of 4th Orbit in hydrogen atom is.

Question # 8

The value of Rydberg constant is:

Question # 9

Which series lies in the ultraviolet region.

Question # 10

Which is not characteristic of Laser.

Question # 11

X-rays were discovered by

Question # 12

The following gas was identified in the sun using spectroscopy

Question # 13

The X-rays diffraction with crystal was first studied by

Question # 14

If 13.6 eV energy is required to ionize the hydrogen atom, then the required energy to remove an electron from n=2 is:

Question # 15

For Paschen series, the value of 'n' starts from

Question # 16

1 rem =

Question # 17

Which is not true for X rays

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FSC Part 2 Physics Chapter 20 Online Test MCQ's

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FSc Part II Physics Chapter 0 Important MCQ's

Sr.# Question Answer
1 Which is not true for X rays
A. X rays are not defected by electric field
B. X rays are polarized
C. X rays consist of electromagnetic waves
D. X rays can be diffracted by grating
2 In according with Bohr's theory the K.E of the electron is equal to:
A. ke2/2r
B. Ze2/r
C. Ze2/r2
D. Ze2/2r2
3 Reflecting mirrors in laser is used to
A. Further stimulation
B. For producing more energetic lasers
C. Both (a) and (b)
D. None of these
4 Helium-Neon laser discharge tube contains neon
A. 82%
B. 15%
C. 25%
D. 85%
5 If 13.6 eV energy is required to ionize the hydrogen atom, then the required energy to remove an electron from n=2 is:
A. 10.2 eV
B. 0 eV
C. 3.4 eV
D. 6.8 eV
6 Photons emitted in inner shell transition are.
A. Continuous X -rays
B. Discontinuous X rays
C. Characteristic X rays
D. Energetic X rays
7 Which of the following series of hydrogen spectrum lies in ultra violet region.
A. Lyman sereis
B. Paschen series
C. Balmar series
D. Bracket series
8 In Helium Neon laser, the discharge tube is filled with
A. 80% He, 20% Neon
B. 85% He, 15% Neon
C. 83% He, 17% Neon
D. 90% He, 10% Neon
9 Bremsstrahlung radiation are examples of
A. Atomic spectra
B. Molecular spectra
C. Continuous spectra
D. Discrete spectra
10 Which of the following is one of the spectral series of atomic hydrogen?
A. Brockett series
B. Balmer series
C. P fund series
D. All of above

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