CBSE  /  Class 11  /  Physics  /  Thermal Properties of Matter

  • 1. 
    Absorptive power of perfectly black body is

  • Zero
  • Infinity
  • One
  • Constant

  • 2. 
    A black body at hot temperature at 227°C radiates heat at a rate of 5 cal/cm²s. at a temperature of 727°C the rate of heat radiated per unit area will be

  • 50 cal/cm²s
  • 250 cal/cm²s
  • 80 cal/cm²s
  • 100 cal/cm²s

  • 3. 
    A body cools from 50°C to 46°C in 5 minutes and to 40°C in the next 10 minutes. The surrounding temperature is

  • 30°C
  • 28°C
  • 36°C
  • 32°C

  • 4. 
    For which of the following process, the thermal conduction is maximum?

  • Combustion
  • Radiation
  • Convection
  • Conduction

  • 5. 
    A bucket full of hot water is kept in a room and it cools from 75°C to 70°C in t1 minutes from 70°C to 65°C in t2 minutes and from 65°C to 60°C in t3 minutes; then

  • t1 - t2 = t3
  • t1 < t2 < t3
  • t1 > t2 > t3
  • t1 < t2 > t3

  • 6. 
    The good absorber of heat are

  • Non-emitter
  • Poor-emitter
  • Good-emitter
  • Highly polished

  • 7. 
    Two stars A and B radiate maximum energy at 3600°A and 3600°A respectively. Then the ratio of absolute temperatures of A and B is

  • 256 : 81
  • 81 : 256
  • 3 : 4
  • 4 : 3

  • 8. 
    A person with dark skin as compared to a person with white skin will experience

  • Less heat and less cold
  • More heat and more cold
  • More heat and less cold
  • Less heat and more cold.

  • 9. 
    A cup of tea cools from 80°C to 60°C in one minute. The ambient temperature is 30°C. in cooling from 60°C to 50°C, it will take.

  • 50 sec
  • 90 sec
  • 60 sec
  • 30 sec

  • 10. 
    The best ideal black body is

  • Lamp of charcoal heated to high temperature
  • Metal coated with a black dye
  • Glass surface coated with coalter
  • Hollow enclosure blackened inside and having a small hole
Report Question
warning
Practice More On Thermal Properties of Matter
Quiz 1 Quiz 2
access_time
  Time