The top of a lake gets frozen at a place where the surrounding air is at a temperature of $-20\,^oC$. Then
The top of a lake gets frozen at a place where the surrounding air is at a temperature of $-20\,^oC$. Then
- A
The temperature of the layer of water in contact with the lower surface of the ice block will be at $0\,^oC$ and that at the bottom of the lake will be $4\,^oC$
- B
The temperature of water below the lower surface of ice will be $4\,^oC$ right up to the bottom of the lake
- C
The temperature of the water below the lower surface of ice will be $0\,^oC$ right up to the bottom of the lake
- D
The temperature of the layer of water immediately in contact with the lower surface of ice will be about $-20\,^oC$ and that of water at the bottom will be $0\,^oC$
Similar Questions
Write Newton's law of cooling and obtain its equations.
Write Newton's law of cooling and obtain its equations.
A sphere, a cube and a disc all of the same material, quality and volume are heated to $600\,^oC$ and left in air. Which of these will have the lowest rate of cooling ?
A sphere, a cube and a disc all of the same material, quality and volume are heated to $600\,^oC$ and left in air. Which of these will have the lowest rate of cooling ?
Which of the following statements is true/correct
Which of the following statements is true/correct
$Assertion :$ Perspiration from human body helps in cooling the body.
$Reason :$ A thin layer of water on the skin enhances its emissivity.
$Assertion :$ Perspiration from human body helps in cooling the body.
$Reason :$ A thin layer of water on the skin enhances its emissivity.
- [AIIMS 2006]
A calorimeter of mass $0.2$ kg and specific heat $900 J/kg-K$ . Containing $0.5$ kg of a liquid of specific heat $2400J /kg-K$ . Its temperature falls from ${60^o}C\,{\rm{to}}\,\,{\rm{5}}{{\rm{5}}^{\rm{o}}}C$ in one minute. The rate of cooling is ....... $J/s$
A calorimeter of mass $0.2$ kg and specific heat $900 J/kg-K$ . Containing $0.5$ kg of a liquid of specific heat $2400J /kg-K$ . Its temperature falls from ${60^o}C\,{\rm{to}}\,\,{\rm{5}}{{\rm{5}}^{\rm{o}}}C$ in one minute. The rate of cooling is ....... $J/s$