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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 record physical happenings at a distant place ?

  • Thermostat
  • Tonometer
  • Telemeter
  • Transponder

Answer: Option C

Explanation:

Thermostat - is used to regulate the temperature at a particular point.

Tonometer - is used to measure the pitch of a sound,

Transponder - is used to receive a signal and transmit a reply immediately.

2. What is the maximum value of deforming force upto which a material shows elastic property and above which the material loses it ?

  • Elasticity
  • Strain
  • Elastic Limit
  • Stress

Answer: Option C

3. What is the relation between wavelength, frequency and velocity ?

  • velocity of wave = frequency * wavelength
  • velocity of wave = frequency/wavelength
  • velocity of wave = wavelength/frequency
  • None of above

Answer: Option A

4. Which are the primary Colours ?

  • Yellow, Green, Blue
  • Red, Magenta, Blue
  • Red, Green, White
  • Red, Green, Blue

Answer: Option D

Explanation:

Red, Green, Blue are primary colours. All the colours can be produced by them by mixing in different proportions. Interesting :)

5. If no external force acts on a system of bodies, the total linear momentum of the system of bodies remains constant. Which law states this ?

  • Newton first law
  • Newton second law
  • Newton third law
  • Principle of conservation of linear momentum

Answer: Option D

Read more from - Physics Questions Answers
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