Physics MCQs

Physics Objective (Multiple Choice) General Knowledge & General Science Questions & Answers for SSC-CGL, UPPSC, NDA, CDS and all one day examinations of India.

21. Which of the following is correct about the rate of loss of heat of the body, as per the Newton’s law of cooling?
[A] It is directly proportional to the difference of body’s temperature and the surroundings
[B] It is inversely proportional to the difference of body’s temperature and the surroundings
[C] It is equal to the difference of body’s temperature and the surroundings
[D] None of the above

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22. What is the refractive index of water?
[A] 1
[B] 1.01
[C] 1.33
[D] 1.78

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23. Which of the following is true about a concave lens?
[A] power of a concave lens is positive
[B] power of a concave lens is negative
[C] power of a concave lens is zero
[D] None of the above

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24. For how long approximately an image persists on the retina before vanishing?
[A] 1/8 seconds
[B] 1/16 seconds
[C] 1/32 seconds
[D] 1 second

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25. What number does orange colour represent in the resistance colour code?
[A] 1
[B] 2
[C] 3
[D] 4

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26. Which of the following is a commonly used moderator in a Nuclear reactor?
[A] Heavy water
[B] Graphite
[C] Water
[D] All of the above

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27. Which of the following metal foils was used in the Rutherford’s alpha particle scattering experiment?
[A] Copper
[B] Silver
[C] Gold
[D] Aluminium

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28. What is the charge of a p-type semiconductor?
[A] Positive
[B] Negative
[C] Neutral
[D] None of the above

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29. What is the reason for formation of Mirage in desert?
[A] Refraction of light
[B] Reflection of light
[C] Total internal reflection of light
[D] Both Refraction and Total internal reflection of light

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30. Which of the following is the distance between the two successive nodes of a standing wave?
[A] 1
[B] 1/2
[C] 3/4
[D] 1/3

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