Physics Multiple Choices Questions PPSC

1. Due to the relative motion of the observer and reference frame, time is …
(A) Constant
(B) Uniform
(C) Contracts
(D) Dilates

2. Rest mass energy of an electron is …
(A) 1.02 MeV
(B) 0.422 keV
(C) 2.02 MeV
(D) 0.511 MeV

3. According to the theory of relativity, the mass of an object depends on …
(A) Particles
(B) Volume of an object
(C) Speed of light
(D) Area of an object

4. Which phenomenon is best explained by the particle nature of light?
(A) Photoelectric effect
(B) Polarization
(C) Doppler effect
(D) Interference

5. Which color of light has the greatest energy per photon?
(A) Violet
(B) Green
(C) Blue
(D) Both A & B

6. An infinite mass would require infinite ______ to accelerate it.
(A) Energy
(B) Light
(C) Power
(D) Force

7. The Compton effect confirms:
(A) Wave nature of light
(B) Dual nature
(C) Particle nature
(D) Both A & C

8. Elementary particles are the basic building blocks of …
(A) Solids
(B) Liquids
(C) Gases
(D) Matter

9. At constant pressure, the graph between V and T is …
(A) Straight line
(B) Parabola
(C) Hyperbola
(D) Ellipse

10. An isothermal process is carried out at constant …
(A) Energy
(B) Volume
(C) Temperature
(D) Pressure

11. The polarization of light shows that light waves are …
(A) Transverse
(B) Longitudinal
(C) None of these
(D) Both A & B

12. The bending of light rays or images in a denser medium is called …
(A) Refraction
(B) Reflection
(C) Transpiration
(D) Operation