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Sunday, 21 July 2019

Energy from the sun reaches Earth mostly by

  By GK Planet Team       Sunday, 21 July 2019
Q. Energy from the sun reaches Earth mostly by
  1. conduction.
  2. convection.
  3. radiation.
  4. thermal expansion.
Answer: Radiation

Heat from sun reaches us by radiation. Air between is not heated.
In physics, radiation is the emission or transmission of energy in the form of waves or particles through space or through a material medium.
Q.
Assertion: Heat from the sun reaches the earth by convection.
Reason: Air can be heated only by convection
  1. If both, Assertion and Reason are true and Reason is the correct explanation of the Assertion.
  2. If both, Assertion and Reason are true but Reason is not a correct explanation of the Assertion.
  3. If Assertion is true but the Reason is false.
  4. If A is false but R is true
Answer:D
When a fluid, such as air or a liquid, is heated and then travels away from the source, it carries the thermal energy along. This type of heat transfer is called convection.
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