What is Dry Ice?

What is an IC? State the advantages of using IC in an electronic circuit.

What is the latent heat of the fusion of ice?

What is the role of ZnCl_2 in dry cell?

Ice is formed on the top surface of a lake. Temperature of air above ice is -15^(@)C , (i) What is the temperature of the water layer just below ice? (ii) Find the maximum possible temperature at the bottom of the lake.

The emf of a dry cell is 1.5 V , when an ammeter and a resistance are connected with the series combination of two dry cells in series,then the ammeter reads 1A,and when the cells are connected in parallel the reading of the ammeter becomes 0.75A What is the internal resistance of the dry cell? Draw the circuit diagrams?

The top of a lake is frozen. Air just above the ice layer is at -15^(@)C . What is the temperature of the water layer just below ice? Comment on the maximum possible temperature at the bottom of the lake.