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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 :)

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. Which law states, "The rate of loss of heat by a body is directly proportional to the difference in temperature between the body and the surroundings."

  • Doppler's Effect
  • Newton's law of cooling
  • Kirchhoff's Law
  • Stefan's Law

Answer: Option B

Explanation:

Doppler's Effect - The Doppler effect can be described as the effect produced by a moving source of waves in which there is an apparent upward shift in frequency for observers towards whom the source is approaching and an apparent downward shift in frequency for observers from whom the source is receding.

Kirchhoff's Law - Kirchhoff's Law signifies that good absorbers are good emitters.

Stefan's Law - The radiant energy emitted by a black body per unit area per unit time is directly proportional to the fourth power of its absolute temperature.

3. Name of the instrument to measure atomspheric pressure ?

  • Barometer
  • Barograph
  • Bolometer
  • Callipers

Answer: Option A

Explanation:

Barograph - Recordings of atmospheric pressure,
Bolometer - Used to measure heat radiation,
Callipers - Used to measure inner and outer diameters of bodies.

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. Electric Motor converts

  • Electrical energy into mechanical energy
  • Mechanical energy into Electrical energy
  • Electrical energy into light energy
  • None of above

Answer: Option A

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