Quantrex Quantrex AcademyJEE · NEET · NDA PYQs with solutions Open app
NEET2002PhysicsThermal Properties of MatterActual

Assertion : Woolen clothes keep the body warm in winter. Reason : Air is a bad conductor of heat.

Options

  1. AIf both the assertion and reason are true and reason is a correct explanation of the assertion.
  2. BIf both assertion and reason are true but assertion is not a correct explanation of the assertion.
  3. CIf the assertion is true but the reason is false.
  4. DIf both assertion and reason are false.

Correct answer

A. If both the assertion and reason are true and reason is a correct explanation of the assertion.

Step-by-step solution

Woolen fibres enclose a large amount of air in them. Both wool and air are the bad conductors of heat and their coefficient of thermal conductivity is small. Thus they prevent any loss of heat from our body.

Practice Thermal Properties of Matter on Quantrex Academy →

More from Thermal Properties of Matter

A cylindrical rod with one end in a steam chamber and the other end in ice results in melting of 0.1 gram of ice per second. If the rod is replaced by another with half the length 2026A spherical blackbody of radius 10 m is maintained at a temperature T , radiating power P with a peak emission wavelength 5000 Å . If the body is compressed uniformly such that its 2026The rectangular surface area (12 cm 6 cm ) of the black body, at a temperature 127^ C , emits heat energy at the rate of Q units per second. If the length and breadth of the surfac 2026A metal sphere cools at a rate of 2^ C/min when the temperature is 80^ C . If the temperature of the surroundings is 30^ C , then the rate of cooling when its temperature is 50^ C 2026A resistance thermometer has resistance 95 at the ice point and 140 at the steam point. The resistance obtained if the actual temperature is 30^ C is 2026A metal sphere cools from 80^ C to 60^ C in 10 minute. The time taken (in minute) by it to cool from 60^ C to 40^ C if the room temperature is 30^ C , is 2026If the temperature of 5 kg mass of a material of a specific heat capacity 200 J/kg ^ C rises from the 30^ C to 40^ C. The heat received is 2026The initial temperature of a body is 80^ C . If its temperature falls to 64^ C in 5 minutes and in the next 10 minutes to 52^ C , then the temperature of the surroundings is 2026 Full Thermal Properties of Matter list All NEET PYQs