Modern Physics Multiple Choice Questions with Answers – PDF Download

MCQ 1: Rest mass energy of an electron is:

1. 1.02 MeV
2. 0.511KeV
3. 0.511 MeV
4. 2.02 MeV

MCQ 2: When K.E_max of photoelectrons is zero, then the frequency of incident photon relative to threshold frequency is:

1. less
2. equal
3. greater
4. small

MCQ 3: An inertial frame of reference is the frame:

1. in which first law of motion is valid
2. in which law of inertia is valid
3. which is not moving with uniform velocity
4. both a and b

MCQ 4: In photocell caesium, coated oxidized silver cathode emits electrons for:

1. visible light
2. ultraviolet
3. infrared light
4. x-rays

MCQ 5: According to the theory of relative mass of an object is:

1. depends on particles
2. speed of light
3. volume of object
4. area of object