# General Science - Physics MCQs

Physics Objective (Multiple Choice) General Knowledge & General Science Questions & Answers for SSC-CGL, UPPSC, UPSC, NDA, CDS and UPSC Civil Services Prelims Examinations.

11. Consider the following physical quantities:

1. Entropy
2. Work
3. Momentum
4. Force

Which of the above are vector quantities?

[A] 1 & 2
[B] 2 & 3
[C] 3 & 4
[D] 1 & 4

12. The propagation of the Radio Waves in the atmosphere of earth is affected by ___:
1. Reflection
2. Refraction
3. Diffraction
4. Absorption
Choose the correct option from the codes given below:

[A] Only 1, 2 & 3
[B] Only 1, 3 & 4
[C] Only 1, 2 & 4
[D] 1, 2, 3 & 4

13. In which of the following respects, the ultra-violet radiations are similar to white light?

1. Both obey the laws of reflection and refraction
2. Both travel with same speed in vacuum
3. Both are equally active chemically
4. Both are scattered equally

Select the correct option from the codes given below:

[A] Only 1
[B] Only 1 & 2
[C] Only 1, 2 & 3
[D] 1, 2, 3 & 4

14. Which of the following makes a CD or DVD show rainbow pattern?

[A] Diffraction of the Light
[B] Thin-Film Interference of the light
[C] Scattering of the light
[D] Polarisation of the light

15. Due to which of the following phenomena, the coloured glass appears white when crushed into fine powder?

[A] Total Internal Reflection
[B] Diffraction
[C] Scattering
[D] Refraction

16. Who among the following is credited to work for the unification of electricity, magnetism and optics field of Physics?

[A] James Clerk Maxwell
[C] Haris Christian Oersted
[D] Isaac Newton

17. The force between charged particles is called as:

[A] Nuclear Force
[B] Gravitational Force
[C] Centrifugal Force
[D] Electromagnetic Force

18. What is the time taken by the earth to complete one rotation about its axis with regard to a fixed star?

[A] Sidereal day
[B] Solar day
[C] Shake
[D] Tropical year

19. Which of the following units is NOT used for measuring length?

[A] Astronomical Unit
[B] Light year
[C] Par sec
[D] slug