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.

21. Consider the following statements with respect to the Thermionic emission:
1. It is caused by electrons or ions that break loose from the metal surface due to heat energy
2. A metal cannot emit thermions at all temperatures
Which among the above statements is / are correct ?

[A] Only 1
[B] Only 2
[C] Both 1 & 2
[D] Neither 1 nor 2

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22. 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

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23.     Consider the following statements:

  1. Speed of sound increases with increase in density of the medium
  2. Speed of sound increases with increase in temperature of the medium

   Which of the above statements is/are correct?

[A] 1 Only
[B] 2 Only
[C] Both 1 & 2
[D] Neither 1 nor 2

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

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

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25. Optical Fibre technology works on which of these principles of Physics?

[A] Bernoulli’s Principle
[B] Newton’s law of Motion
[C] Total internal reflection of Light
[D] Photoelectric effect

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26. Which of the following is not a valid conservation law of classical Physics?

[A] Law of conservation of energy
[B] Law of conservation of current
[C] Law of conservation of angular momentum
[D] Law of conservation of charge

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27. What is the range of masses involved in the study of Physics?

[A] 10-19 kg to 1038 kg
[B] 10-30 kg to 1055kg
[C] 10-30 kg to 1030kg
[D] 10-19 kg to 1055 kg

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28. Who among the following is credited for the discovery of ‘Expanding Universe’?

[A] Edwin Hubble
[B] Niels Bohr
[C] S Chandra Shekhar
[D] C.V Raman

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29. Who among the following gave the Uncertainity principle?

[A] R.A Milkman
[B] Ernset Rutherford
[C] S.N Bose
[D] Werner Heisenberg

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30. The force between charged particles is called as:

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

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