10th P.S quiz - 8(Heat) by PRABHAKAR MIRIYALA

The value of 25⁰C in Kelvin scale is

• 25 K

• -298 K

• 248 K

• 298 k

1 cal/gm. $\degree C$  =  -------- J/Kg.K

• 4186

• 4.186

• 41.86

• 418.6

The amount of energy required to raise the temperature 1ºC for every kilogram is called____?

• latent heat

• Specific Heat

• latent heat of vaporization

• latent heat offusion

SI unit of specific heat is

• calorie

• cal/gr.⁰C

• joiles

• J/Kg.K

According to principle of method of mixtures

• Net heat lost > net heat gain

• Net heat lost < net heat gain

• Net heat lost = net heat gain

• none of the above

Evaporation takes place -----

• at any temperature below its boiling point

• at constant temperature

• at any temperature above its boiling point

• none of the above

which property of water makes it a good cooling agent?

• its liquid state

• its higher specific heat

• it is colourless

• its temperature

Specific Heat (S) =

• mL

• Q. $\Delta T$

• Q/m. $\Delta T$

• m $\Delta T$ /Q

The higher the humidity, the ________________________ the rate of evaporation of water

• lower

• higher

• no change

• can't say

Evaporation is a ______ phenomenon

• A) Bulk phenomenon

• B) cooling phenomenon

• C) Surface phenomenon

• D) both B and C