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

X-rays were discovered by

Question # 2

Charge on positron is:

Question # 3

The temperature of core of nuclear reactor is:

Question # 4

First spectral series of hydrogen atom was discovered by

Question # 5

An atom can reside in excited state for

Question # 6

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

Question # 7

In Helium Neon laser, the discharge tube is filled with

Question # 8

Bremsstrahlung radiation are examples of

Question # 9

_____ has the largest de Broglie wavelength at same speed.

Question # 10

Helium Neon Laser Beam emitted from discharge tube has a colour.

Question # 11

In an electronic transition atom cannot emit.

Question # 12

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

Question # 13

X- ray diffraction reveals that these are

Question # 14

The X-rays diffraction with crystal was first studied by

Question # 15

The rest mass x ray photon is

Question # 16

The longest wavelength of Paschen series is.

Question # 17

A° is the unit of:

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FSc Part II Physics Chapter 0 Important MCQ's

Sr.# Question Answer
1 Radius of first Bohr's orbit is.
A. 0.053 nm
B. 0.053 mm
C. 0.053 micro meter
D. 0.053 m
2 Production of x rays is reverse process of
A. Photo electric effect
B. Compton effect
C. An nihilation
D. Pair production
3 The first laser was built by
A. ArthursSchawalow
B. T.H.Maiman
C. Peter Sorokin
D. C.H.Townes
4 Photons emitted in inner shell transition are.
A. Continuous X -rays
B. Discontinuous X rays
C. Characteristic X rays
D. Energetic X rays
5 For Holography we use
A. X ray
B. Laser
C. gama rays
D. Beta rays
6 Study of hydrogen visible spectrum in
A. 1886
B. 1887
C. 1895
D. 1885
7 In Helium Neon laser, discharge tube is filled with Neon gas.
A. 10%
B. 15%
C. 85%
D. 90%
8 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
9 Life time of metastable states is
A. 10-6 sec or more
B. 10-3 sec or more
C. 10-5 sec or more
D. None of these
10 If the ionization energy of hydrogen atom is 13.6 eV, its ionization potential will be
A. 136.0 volt
B. 3.0 volt
C. 13.6 volt
D. None of these

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