Advertisements
Advertisements
प्रश्न
How do fishes survive in frozen lakes?
Advertisements
उत्तर
Fishes survive in pond even when the atmospheric temperature is below 0°C. It is because of anomalous expansion of water. When the temperature falls below 0°C water changes into ice and rises to the top and ice being poor conductor of heat helps to keep water below it at 4°C and fish can live in pond water.
APPEARS IN
संबंधित प्रश्न
Give reason of Ice floats on water.
Calculate the time required to heat 20 kg of water from 10°C to 35°C using an immersion heater rated 1000 W. Assume that 80% of the power input is used to heat the water. Specific heat capacity of water = 42000 J kg−1 K−1.
On a winter day the temperature of the tap water is 20°C whereas the room temperature is 5°C. Water is stored in a tank of capacity 0.5 m3 for household use. If it were possible to use the heat liberated by the water to lift a 10 kg mass vertically, how high can it be lifted as the water comes to the room temperature? Take g = 10 m s−2.
At what temperature is the density of water is maximum? State its value.
Explain the following
Fishes survive in ponds even when the atmospheric temperature is well below 0°C.
Density of water is maximum at :
What is the criterion of choosing the two metals for a bimetal strip?
Write scientific reason.
Placing a plastic bottle filled with water in the freezing compartment in the freezer can cause the bottle to explode.
Name the following diagram appropriately.
Write a short note.
Anomalous behaviour of water
