Class X

Process of thermal energy transfer through molecular vibration or free electron diffusion in solids is termed as
  1. Conduction
  2. Convection
  3. Radiation
  4. Conduction and Radiation
Normal human body temperature is equal to 310 K, which is equal to
  1. −37 °C
  2. −583 °C
  3. 583 °C
  4. 37 °C
A rectangle-shaped open-to-sky tank of water has a length of 2 m and a width of 1 m. If atmospheric pressure is assumed to be 100 kPa and thickness of tank walls is assumed to be negligible, force exerted by atmosphere on surface of water would be
  1. 20 kN
  2. 50 kN
  3. 100 kN
  4. 200 kN
A metal wire resists 200 Ω at ice point and 240 Ω at steam point, and resistance of wire is 212 Ω, so room temperature would be
  1. 10 °C
  2. 20 °C
  3. 30 °C
  4. 40 °C
Specific heat capacity of salty (sea) water is
  1. 1900 J kg-1 °C-1
  2. 2900 J kg-1 °C-1
  3. 3900 J kg-1 °C-1
  4. 4900 J kg-1 °C-1
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