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

31. Which of the following is true about working of a photo diode?

[A] It is operated under reverse bias
[B] It is operated under forward bias
[C] Both a and b
[D] None

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32. Which of these instruments is used to measure the wind speed?

[A] Inclinometer
[B] Calorimeter
[C] Anemometer
[D] Fathometer

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33. Which of the following devices is best suited for measuring the temperature inside metallurgical furnaces?

[A] Pyrometer
[B] Thermistor
[C] Thermocouple
[D] Thermometer

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34. Which of the following energy transformation takes place in microphone?

[A] Sound into electrical energy
[B] Electrical into sound energy
[C] Sound into mechanical energy
[D] Mechanical into sound energy

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35. Which of the following conversions is used in Microphone?

[A] Sound waves are converted into electrical energy and then reconverted into sound after transmission
[B] Sound waves are directly transmitted
[C] Electrical energy is converted into sound waves directly
[D] Amplification is not required at all

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36. A boat filled with some stones is floating in water. If the stones are dropped into the water what will happen to the level of the water?

[A] Rise
[B] Decrease
[C] Remain the same
[D] Insufficient data to predict

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37. Total internal reflection can take place when light travels from?

[A] diamond to glass
[B] water to glass
[C] air to water
[D] air to glass

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38. Which of the following fundamental forces of nature is responsible for the conversion of a neutron into a proton, an electron and an anti-neutrino?

[A] Gravitational force
[B] Weak Nuclear force
[C] Strong Nuclear force
[D] Electromagnetic force

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39. What happens to the density of water when it freezes?

[A] Decreases
[B] Becomes Zero
[C] Remains constant
[D] Increases

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40. Soap bubbles look colourful in white light due to__:

[A] Diffraction
[B] Scattering
[C] Reflection
[D] Interference

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