2nd Year Physics Chapter 20 Online MCQ Test for 12th Class Physics Chapter 20 (Atomic Spectra)

ICS Part 2 Physics
Chapter 20 Test

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Physics ICS Part 2 Chapter 20 Online MCQ's Test

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Question # 1

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

Question # 2

The velocity of electron moving is 1st orbit of hydrogen atom is:

Question # 3

Life time of metastable states is

Question # 4

The X-rays diffraction with crystal was first studied by

Question # 5

The unit of Rh is.

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

_____ has the largest de Broglie wavelength at same speed.

Question # 8

Laser is a device which can produce:

Question # 9

Frequency of x-rays depends upon.

Question # 10

Electron volt is unit of:

Question # 11

Energy produced due to fission of uranium atom is:

Question # 12

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

Question # 13

Paschen series lies in the

Question # 14

The shortest wave length is Bracket series has wave length.

Question # 15

The first spectral lines were discovered in 1885, were

Question # 16

Balmer series lies in

Question # 17

Laser is a beam of light which is

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ICS 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 If 13.6 eV energy is required to ionize the hydrogen atom, then the required energy to remove an electron from n=2 is:
A. 10.2 eV
B. 0 eV
C. 3.4 eV
D. 6.8 eV
2 Earth orbital speed is
A. 10 km/s
B. 20 km/s
C. 30 km/s
D. 40 km/s
3 X-rays were discovered by
A. Curie
B. Henry Becquerel
C. Rontgen
D. None of these
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 Helium Neon Laser Beam emitted from discharge tube has a colour.
A. Blue
B. Green
C. Red
D. Black
6 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
7 The radius of 10th orbit in hydrogen atom is.
A. 0.053 nm
B. 0.53 nm
C. 5.3 nm
D. 53 nm
8 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
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 Frequency of x-rays depends upon.
A. Number of electrons striking target
B. Accelerating potencial
C. Nature of the target
D. Both B and C

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