12th Physics unit 19 Dawn of modern Physics Past papers MCQs. While MCQs are collected from Inter Boards of Lahore. Similarly MCQs from Punjab Boards.
12th Physics Unit 19 MCQs
2nd Year Physics Unit Dawn of Modern Physics:
Wave nature of light appears in:
(A) Pair production
(B) Compton effect
(C) Photo electric
(D) Interference
The value of Stefan’s constant is: (SWI. GI, 2017)
(A) 2.9×10-‘mk
(B) 1.0974×10’m-
(C) 6.63×10-34]
D 5.67×10-8w-mk4
The Compton shift is equal to Compton wavelength at (DGK. GI, 2017)
(B) 120°
(C) 45°
Which is the most refined form of matter? (DGK. GI, 2015)
(A) Smoke
(B) Fog
(C) Light
(D) Electron
If a particle of mass “m” is moving with speed “y” then de-Broglie wavelength 2 associated
with it will be: (BWP. GI, 2017)
(A) 1 =>
(Β) λ=:
την
mv
2my
The energy of photon is given by: (BWP. GI, 2017)
(A)
(B) hf
(C) ve
(D) m.ca
The principle regarding the dual nature of light was first discovered by: (BWP. GI, 2015)
(A) Compton
(B) J.J Thomson
(C) De-Broglie
(D) Heisenberg
Application of wave like nature of particle is: (GRW.GI, 2015) (MLN. 2018)
(A) Photodiode
(B) Optical microscope
C) Electron microscope
(D) Compound microscope
Pair production can take place only when the energy of radiation is equal and greater than 1.02
MeV, thus correct option is: (BWP. GI, 2017)
(A) X-rays
(B) Heat Radiation
C) Y-rays
(D) Ultraviolet rays
Dawn of Modern Physics 2nd Year Physics MCQs:
Inertial frame is a frame in which: (DGK. GI, 2015)
(A) ist law holds
(B) 2nd law holds
C 3rd law hold
(D) Kelvin’s law holds
The wavelength associated with the proton moving at a speed of 40 m/s is: (LHR. GI, 2018)
(A) 7.20 nm
(B) 9.02 nm
(C) 15.7 nm
(D) 17.3 nm
The energy of the photon of wavelength 500 nm is: (LHR. GI, 2018)
A) 3.10 eV
(B) 2.49 eV
(C) 1.77 eV
(D) 1.52 eV
- The photon with energy greater than 1.02 MeV can interact with matter as: (LHR. GII, 2018)
(A) Photoelectric effect
(B) Compton effect
C) Pair production
(D) Annihilation of matter
By modern system of NAVSTAR, the speed anywhere on the earth can be determined to
accuracy about (GRW.2018)
(A) 20 ms
(B) 10 ms-
(C) 2 cms-
(D) 2 ms-!
Which one is low energy photon? (FBD. 2018)
(A) Visible light
B) Infrared light
(C) Ultra violet light
(D) X-rays
The unit of Plank’s constant is: (FBD. 2018)
(A) Joule
B Joule-s
(C) Watt
(D) Candela
Platinum wire becomes yellow at a temperature of: (SWL 2018)
(A) 1100 K
(B) 1300 K
(C) 1573 K
(D) 1873 K
When the speed of the object is half of the speed of light, then (SGD. GII, 2018)
(B) = 27
(A) 1=
(C) –