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General Knowledge :: Physics

  1. A person does some work of 1,000 J in 2 s. His power will be ________

  2. A.

     1000W

    B.

     25W

    C.

     500W

    D.

     50W


  3. Which results in an increase in power?

  4. A.

     Doing more work in less time.

    B.

     Doing less work in more time.

    C.

     Doing less work in less time.

    D.

     Doing more work in more time.


  5. What device converts light energy to electrical energy?

  6. A.

     Photodiode

    B.

     Photovoltaic cell

    C.

     Thermocouple

    D.

     Heliostats


  7. In a water lifting electric pump, we convert

  8. A.

     Electrical energy into Potential energy

    B.

     Kinetic energy into Electrical energy

    C.

     Kinetic energy into Potential energy

    D.

     Electrical energy into Kinetic energy


  9. The device which converts sound energy into electrical energy is called

  10. A.

     Amplifier

    B.

     Speaker

    C.

     Microphone

    D.

     Transmitter


  11. What is the SI unit of Power?

  12. A.

     Boyle

    B.

     Watt

    C.

     Newton

    D.

     Pascal


  13. For which one of the following does the centre of mass lie outside the body?

  14. A.

     A fountain pen

    B.

     A cricket ball

    C.

     A ring

    D.

     A book


  15. When a pail of water is swung in a vertical circle, the water does not fall out at the top of the loop when the speed is

  16. A.

     Below a certain minimum value irrespective of amount of water in the pail

    B.

     Above a certain minimum value irrespective of amount of water in the pail

    C.

     Above a certain minimum value depending on amount of water in the pail

    D.

     Below a certain minimum value depending on amount of water in the pail


  17. Fat can be seperated from milk in a cream seperator because of :

  18. A.

     Cohesive Force

    B.

     Gravitational Force

    C.

     Centripetal Force

    D.

     Centrifugal Force


  19. In case of uniform circular motion, the acceleration is

  20. A.

     Variable in magnitude but constant in direction

    B.

     Constant in magnitude and directed radially inwards

    C.

     Variable in magnitude but tangential to the circle

    D.

     Zero