Modern Physics MCQs
1. In photocell cesium is coated with oxidized silver cathode emits electrons for…
A. visible light
B. ultraviolet
C. infrared light
D. x-rays
2. An inertial frame of reference is frame
A. in which first law of motion and inertia is valid
B. inertia is valid
C. which is not moving with uniform velocity
D. both a and b
3. Rest mass energy of an electron is
A. 1.02 MeV(Million Electron Volts)
B. 0.511KeV(kilo Electron Volts)
C. 0.511 MeV
D. 2.02 MeV
4. According to the theory of relative mass of an object is equal to…
A. depends on particles
B. speed of light
C. volume of the object
D. area of the object
5.According to the special theory of relativity which one is not an absolute quantity?
A. Time and mass
B. mass
C. height
D. none of above
6. The special theory of relativity treats problems involving to which frame of reference …
A. inertial frame of reference
B. non-inertial frame of reference
C. non-accelerated frame of reference
D. accelerated frame of reference
7. Quantum effects are important only when observing
A. small objects
B. very large objects
C. atomic spectra
D. atomic size objects
8. A statement saying that energy is radiated or absorbed in discrete packets is given by
A. plank(1.616229(38)×10-35 meters)
B. Einstein
C. Stephen
D. Wien
9. Phenomena that cannot be understood with the framework of classical physics is
A. blackbody radiation, atomic spectra
B. atomic spectra
C. inertial frame
D. none of above
10. The behavior of matter on an atomic level cannot be explained in which of the following.
A. modern physics
B. classical physics
C. relativistic mechanics
D. atomic spectra
11. Max K.E(Kinetic Energy) of photo electrons depend upon light’s
A. intensity
B. frequency
C. wavelength
D. energy
12. Earth can be considered as which type of frame
A. inertial frame
B. non-inertial frame
C. accelerated frame
D. velocity frame
