20th Chapter

FSC Part 2 Physics Chapter 20 Online Test MCQ's

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

FSC Part 2 Physics
Chapter 20 Test

Start Chapter 20 Test

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

Sr. # Questions Answers Choice
1 Laser is a beam of light which is
  • A. Monochromatic
  • B. Coherent
  • C. Unidirectional
  • D. All of these
2 The series in visible region is:
  • A. Balmer series
  • B. Pfund series
  • C. Paschen series
  • D. None of above
3 Radius of first orbit of an atom is r1= 0.053 nm, Radius of second orbit r2 will be.
  • A. 0.106 nm
  • B. 0.212 nm
  • C. 0.053 nm
  • D. 0.53 x 10<sup><a href="null">-10</a></sup> nm
4 The X-rays diffraction with crystal was first studied by
  • A. W.H Bragg
  • B. W.L. Bragg
  • C. Michelson
  • D. None of these
5 In Helium Neon laser, discharge tube is filled with Neon gas.
  • A. 10%
  • B. 15%
  • C. 85%
  • D. 90%
6 The Balmer series is obtained when all the transition of electrons terminate on
  • A. 1<sup>st</sup> orbit
  • B. 2nd orbit
  • C. 3rd orbit
  • D. 4th orbit
7 Balmer Empirical formula explains the electromagnetic radiation of any excited atom in terms of their.
  • A. Energy
  • B. Mass
  • C. Wave length
  • D. Momentum
8 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
9 A° is the unit of:
  • A. Energy
  • B. Length
  • C. Nuclear energy
  • D. Work
10 The idea of laser device was first introduced by C.H. Towners and Authers Schowlan is
  • A. 1972
  • B. 1965
  • C. 1958
  • D. 1913

Top Scorers of Physics FSC Part 2 Chapter 20 Online MCQ's Test

U

Umar Hassan

Lahore28 - Jun - 2025

17/17
02 Mins 05 Sec
A

Awais Farooq

Lahore20 - Apr - 2025

16/17
50 Sec
A

Awais Farooq

Lahore20 - Apr - 2025

16/17
55 Sec
4

416 Alina Abbas

Lahore29 - Apr - 2025

16/17
01 Mins 36 Sec
M

Muhammad Hazim Abdullah

Lahore27 - Apr - 2025

16/17
01 Mins 39 Sec
H

Hamza Khaleel

Lahore03 - May - 2025

16/17
03 Mins 08 Sec
N

Nazia Farhat

Lahore26 - Apr - 2025

16/17
06 Mins 10 Sec
M

Muhammad Hazim Abdullah

Lahore27 - Apr - 2025

15/17
02 Mins 39 Sec
H

Hamza Khaleel

Lahore03 - May - 2025

15/17
03 Mins 35 Sec
A

Awais Farooq

Lahore20 - Apr - 2025

14/17
42 Sec
A

Awais Farooq

Lahore20 - Apr - 2025

14/17
01 Mins 07 Sec
A

Awais Farooq

Lahore20 - Apr - 2025

14/17
01 Mins 07 Sec
A

Awais Farooq

Lahore20 - Apr - 2025

14/17
01 Mins 08 Sec
U

Umar Hassan

Lahore28 - Jun - 2025

14/17
01 Mins 55 Sec
A

Aqleema Noor

Lahore13 - May - 2025

14/17
01 Mins 57 Sec

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