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. These questions are part of GKToday’s 35000+ MCQs Bank Course in GKToday Android App

21. Which of the following conditions will not show any Doppler effect?

[A] When source and listener both are at rest
[B] When medium alone is moving
[C] When source and listener are moving in mutually perpendicular directions
[D] All of the above

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22. Which of the following is correct about the speed of the sound, at same temperature?

[A] sound travels faster in humid air than in dry air
[B] sound travels slower in humid air than in dry air
[C] speed of sound is same in humid air and dry air
[D] None of the above

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23. What do we call the ratio of the radiant energy absorbed by a body in a given time to the total radiant energy incident on it in the same time?

[A] Coefficient of volume expansion
[B] Thermal strain
[C] Absorptive power
[D] Radiation limit

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24. What do we call the process in which no exchange of heat energy takes place between the gas and the surroundings?

[A] Adiabatic
[B] Isothermal
[C] Isochoric
[D] Isobaric

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25. What do we call the process taking place at constant volume?

[A] Adiabatic
[B] Isothermal
[C] Isochoric
[D] Isobaric

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26. What is the S.I. unit of power of a lens?

[A] metre
[B] watt
[C] dioptre
[D] second

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27. What is the size of the image formed by a concave mirror when the object is at focus?

[A] Enlarged
[B] Point sized
[C] Same size
[D] Highly enlarged

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28. What is the nature of image formed by a convex mirror when the object is placed at infinity?

[A] Real and inverted
[B] Virtual and erect
[C] Virtual and inverted
[D] Real and erect

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29. What is the magnetic field at any point in the open space inside the toroid?

[A] zero
[B] one
[C] Depends on the current in the turns
[D] Depends on number of turns

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30. What is the relationship between the magnetisation of a paramagnetic material and the absolute temperature?

[A] they are directly proportional to each other
[B] they are inversely proportional to each other
[C] they are independent of each other
[D] None

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