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

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

Question # 2

Which series lies in the ultraviolet region.

Question # 3

1 rad =

Question # 4

Laser is a device which can produce:

Question # 5

The radius of 10th orbit in hydrogen atom is.

Question # 6

The first laser was built by

Question # 7

A° is the unit of:

Question # 8

Production of x rays is reverse process of

Question # 9

For Holography we use

Question # 10

X- ray diffraction reveals that these are

Question # 11

Paschen series lies in the

Question # 12

First spectral series of hydrogen atom was discovered by

Question # 13

Electron volt is unit of:

Question # 14

Photons emitted in inner shell transition are.

Question # 15

The value of Rydberg constant is:

Question # 16

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

Question # 17

Balmer Empirical formula explains the electromagnetic radiation of any excited atom in terms of their.

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FSc Part II Physics Chapter 0 Important MCQ's

Sr.# Question Answer
1 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
2 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
3 An atom can reside in excited state for
A. 10-8 second
B. One second
C. 10-10 second
D. More than one second
4 The rest mass x ray photon is
A. Infinite
B. Zero
C. 1.67 X-17 kg
D. All of the above
5 When an electron in an atom goes from a lower to higher orbit its:
A. K.E increases , P.E decreases
B. K.E increases , P.E increases
C. K.E decreases , P.E increases
D. K.E decreases , P.E decreases
6 The unit of Rh is.
A. ms-1
B. m
C. m2
D. m-1
7 Laser is a beam of light which is
A. Monochromatic
B. Coherent
C. Unidirectional
D. All of these
8 In the Bohr's model of the hydrogen atom, the lowest orbit corresponds to:
A. Infinite energy
B. Maximum energy
C. Minimum energy
D. Zero energy
9 Boher proposed his atomic model in:
A. 1910
B. 1911
C. 1912
D. 1913
10 For an atom of hydrogen atom the radius of the first orbit is given by:
A. H/me2
B. me/4h2
C. h2/4π2 kme2
D. h2 me2

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