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Which instrument is used to measure the power of electric circuit ?

  • Voltmeter
  • Wattmeter
  • Wavemeter
  • Viscometer

Answer: Option B

Explanation:

Voltmeter - is used to measure electric potential difference between two points,
Wavemeter - is used to measure the wavelength of a radiowave,
Viscometer - is used measure viscosity of liquid.

Similar Questions :

1. Which instrument is used to measure the scattering of light by particles suspended in a liquid ?

  • Nephetometer
  • Ohmmeter
  • Ondometer
  • Pyrometer

Answer: Option A

Explanation:

Ohmmeter - is used to measure electrical resistance in ohms,

Ondometer - is used to measure frequency of electromagnetic waves,

Pyrometer - is used to measure very high temperature.

2. What is newton third law of motion ?

  • Every body maintains its initial state rest or motion unless no external force is applied.
  • The rate of change in momentum of a body is directly proportional to the applied force on the body and takes place in the direction of force.
  • To every action there is equal and opposite reaction.
  • None of above.

Answer: Option C

Explanation:

Newton First Law of Motion : Every body maintains its initial state rest or motion unless no external force is applied.

Newton Second Law of Motion : The rate of change in momentum of a body is directly proportional to the applied force on the body and takes place in the direction of force.

3. The nuclear reaction in which a heavy nucleus splits into two nuclei of nearly equal mass is called

  • Nuclear fusion
  • Nuclear fission
  • Nuclear reaction
  • Fast breeding

Answer: Option B

4. Which instrument is used to determine the intensity of colours ?

  • Cathetometer
  • Chronometer
  • Colorimeter
  • Commutator

Answer: Option C

Explanation:

Cathetometer - is used to determine heights,

Chronometer - is used to longitude of a vessel at sea,

Commutator - is used to convert AC to DC.

5. What is unit of Work and Energy ?

  • Joule
  • kilogram
  • amphere
  • meter

Answer: Option A

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