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

First spectral series of hydrogen atom was discovered by

Question # 2

Earth orbital speed is

Question # 3

Production of x rays is reverse process of

Question # 4

X-rays were discovered by

Question # 5

The X-rays diffraction with crystal was first studied by

Question # 6

The energy of 4th Orbit in hydrogen atom is.

Question # 7

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

Question # 8

The rest mass x ray photon is

Question # 9

Photons emitted in inner shell transition are.

Question # 10

Charge on positron is:

Question # 11

Electron volt is unit of:

Question # 12

Reflecting mirrors in laser is used to

Question # 13

For Holography we use

Question # 14

Radius of first orbit of an atom is r1= 0.053 nm, Radius of second orbit r2 will be.

Question # 15

For an atom of hydrogen atom the radius of the first orbit is given by:

Question # 16

Life time of metastable states is

Question # 17

An electron in H -atom is excited from ground state n=4 , How many spectral lines are possible in this case.

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FSc Part II Physics Chapter 0 Important MCQ's

Sr.# Question Answer
1 Kx -Xrays are produced due to transition of electron from.
A. K to L shell
B. L to K shell
C. M to K shell
D. M to L shell
2 Energy produced due to fission of uranium atom is:
A. 500MeV
B. 200MeV
C. 700MeV
D. 750MEV
3 Laser is a device which can produce:
A. Intense beam of light
B. Coherant beam of light
C. Monochromatic beam of light
D. All of the above
4 Helium-Neon laser discharge tube contains neon
A. 82%
B. 15%
C. 25%
D. 85%
5 In an electronic transition atom cannot emit.
A. Infrared radiations
B. Visible radiations
C. Ultraviolet radiations
D. Gama radiations
6 The following gas was identified in the sun using spectroscopy
A. Hydrogen
B. Helium
C. Carbon
D. Nitrogen
7 Target material used in x-rays tube have following properties.
A. High atomic number and high melting pouint
B. High atomic number and low melting pouint
C. Low atomic number and low melting pouint
D. High atomic number only
8 Boher proposed his atomic model in:
A. 1910
B. 1911
C. 1912
D. 1913
9 In Helium Neon laser, discharge tube is filled with Neon gas.
A. 10%
B. 15%
C. 85%
D. 90%
10 The first laser was built by
A. ArthursSchawalow
B. T.H.Maiman
C. Peter Sorokin
D. C.H.Townes

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