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

Study of hydrogen visible spectrum in

Question # 2

Electron volt is unit of:

Question # 3

Which series lies in the ultraviolet region.

Question # 4

The first laser was built by

Question # 5

Radius of first Bohr's orbit is.

Question # 6

When meta I is heated sufficiently electrons are given off by the metal. This phenomenon is known as.

Question # 7

The first theory about the structure of an atom was introduced by

Question # 8

The line radiations emitted from by hydrogen filled discharge tube can be analyzed into.

Question # 9

Production of x rays is reverse process of

Question # 10

A° is the unit of:

Question # 11

The following gas was identified in the sun using spectroscopy

Question # 12

The series in infrared region is:

Question # 13

The value of Rydberg constant is:

Question # 14

The X-rays diffraction with crystal was first studied by

Question # 15

 Charge on an atom is:

Question # 16

The value of Rydberg constant is

Question # 17

An atom can reside in excited state for

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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 The longest wavelength of Paschen series is.
A. 656 nm
B. 1094 nm
C. 1875 nm
D. 2000 nm
2 Study of hydrogen visible spectrum in
A. 1886
B. 1887
C. 1895
D. 1885
3 In Helium Neon laser, discharge tube is filled with Neon gas.
A. 10%
B. 15%
C. 85%
D. 90%
4 The velocity of electron moving is 1st orbit of hydrogen atom is:
A. 2.09 x 106 ms-1 
B. 2.18 x106 ms-1
C. 2.19 x 106 ms-1
D. 3.18 x106 ms-1
5 Laser is a beam of light which is
A. Monochromatic
B. Coherent
C. Unidirectional
D. All of these
6 When meta I is heated sufficiently electrons are given off by the metal. This phenomenon is known as.
A. Photoelectric effect
B. Piezo electric effect
C. Thermionic emission
D. Secondary emission
7 The idea of laser device was first introduced by C.H. Towners and Authers Schowlan is
A. 1972
B. 1965
C. 1958
D. 1913
8 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 10-10 nm
9 1 rad =
A. 0.001Gy
B. 0.01Gy
C. 0.1Gy
D. 1.01Gy
10 An electron in H -atom is excited from ground state n=4 , How many spectral lines are possible in this case.
A. 6
B. 5
C. 4
D. 3

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