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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 changes in volume of substances ?

  • Dyanamo
  • Dilatometer
  • Cyclotron
  • Electroscope

Answer: Option B

Explanation:

Dyanamo - is used to convert mechanical energy into electrical energy,

Cyclotron - is a charged particle accelerator which can accelerate charged particles to high energies,

Electroscope - is used to detect the presence of an electric charge.

2. Atom is the smallest part of matter which takes part in chemical reactions.

  • True
  • False

Answer: Option A

3. When a body is immersed partly or wholly in a liquid, there is an apparent loss in weight of the body which is equal to the weight of liquid displaced by the body.

  • True
  • False

Answer: Option A

Explanation:

TRUE, it is Archimedes Principle.

4. The rotational effect of a force on a body about an axis of rotation is described in terms of

  • Centre of gravity
  • Centripetal force
  • Centrifugal force
  • Moment of force

Answer: Option D

5. Atmospheric pressure is measured by

  • Tonometer
  • Pyrometer
  • Barometer
  • Thermometer

Answer: Option C

Read more from - Physics Questions Answers
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