Key word for this website is "mdcat stmi" write this on google and click the menu line on left top corner and then click on test , then practice mcqs.
You may like to see:
Download Pakistan's No 1 Handwritten Notes
Q1:The maximum value of photo electric current is called:
A) Base current
B) Emitter current
C) Saturation current
D) Emitter current
C) Saturation current
Q2: Which phenomenon best supports the theory that matter has a wave nature?
A) Electron momentum
B) Electron diffraction
C) Photon momentum
D) Photon diffraction
B) Electron diffraction
Q3: The fast moving light absorbing photons are:
A) alpha radiations
B) gamma radiations
C) beta radiations
D) no radiations
B) Gamma Radiations
Q4: Photon is made up _______ quarks.
A) Basons
B) No quark
C) Quarks in hadrons
D) masons
C) Quarks in hadrons
Q5: Black body radiation light:
A) Emit
B) Absorbed
C) Both
D) None
C) Both
Q6: Find De-Broglie wavelength if mass of 150g and velocity is 50m/s:
A) 3.1 x 10^-18 m
B) 8.81 x 10^-35 m
C) 4.41 x 10^-34 m
D) 3.31 x 10^-38 m
B) 8.81 x 10^-35 m
Q7: What is de-Broglie wavelength associated with an electron , accelerated through a potential difference of 200 volts?
A) 1nm
B) 0.5nm
C) 0.0056nm
D) 0.086nm
D) 0.086nm
Q8: Black body radiations are:
A) Infrared and visible light rays
B) All radiations
C) Visible and ultraviolet rays
D) Ultraviolet rays
B) All radiations
Q9: Where does the energy lost by fast moving electron goes:
A) Appear as photon
B) Appears as electron-positron pair.
C) Appears as its K.E
D) It vanishes
A) Appear as photon
Q10: Photoelectric effect is not given by:
A) X-rays
B) Gamma
C) Beta
D) All
D) All
Q11: The photon when scattered from mirror its momentum becomes:
A) Double
B) Half
C) Remain Same
D) Zero
A) Double
Q12: Calculate the energy of photon of wavelength 6600 angstroms.
A) 0.3 x 10^-19J
B) 3 x 10^-19J
C) 30 x 10^-19J
D) 300 x 10^-19J
B) 3 x 10^-19J
Q13: Life time of an excited state is:
A) 10^-6s
B) 10^-7s
C) 10^-8s
D) 10^-3s
C) 10-3
.png)
0 Comments