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

The rest mass x ray photon is

Question # 2

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

Question # 3

1 rad =

Question # 4

Which is not true for X rays

Question # 5

Life time of metastable states is

Question # 6

Which of the following is one of the spectral series of atomic hydrogen?

Question # 7

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

Question # 8

Paschen series lies in the

Question # 9

Bremsstrahlung radiation are examples of

Question # 10

In the Bohr's model of the hydrogen atom, the lowest orbit corresponds to:

Question # 11

The longest wavelength of Paschen series is.

Question # 12

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

Question # 13

For Holography we use

Question # 14

The energy of 4th Orbit in hydrogen atom is.

Question # 15

Target material used in x-rays tube have following properties.

Question # 16

Kx -Xrays are produced due to transition of electron from.

Question # 17

If the ionization energy of hydrogen atom is 13.6 eV, its ionization potential will be

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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 The X-rays diffraction with crystal was first studied by
A. W.H Bragg
B. W.L. Bragg
C. Michelson
D. None of these
2 Photons emitted in inner shell transition are.
A. Continuous X -rays
B. Discontinuous X rays
C. Characteristic X rays
D. Energetic X rays
3 Radius of first Bohr's orbit is.
A. 0.053 nm
B. 0.053 mm
C. 0.053 micro meter
D. 0.053 m
4 Reflecting mirrors in laser is used to
A. Further stimulation
B. For producing more energetic lasers
C. Both (a) and (b)
D. None of these
5 In an electronic transition atom cannot emit.
A. Infrared radiations
B. Visible radiations
C. Ultraviolet radiations
D. Gama radiations
6 Which of the following series of hydrogen spectrum lies in ultra violet region.
A. Lyman sereis
B. Paschen series
C. Balmar series
D. Bracket series
7 A° is the unit of:
A. Energy
B. Length
C. Nuclear energy
D. Work
8 1 rad =
A. 0.001Gy
B. 0.01Gy
C. 0.1Gy
D. 1.01Gy
9 The shortest wave length is Bracket series has wave length.
A. 16/Rn
B. Rn/16
C. 16 Rn
D. 4 Rn
10 The first orbit in the hydrogen atom has a radius.
A. 0.53 nm
B. 0.053 nm
C. 0.0053 nm
D. 0.00053 nm

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