Heat and Energy — PHYSICS STD 9 — Question

Name the physical quantity related to the following unit:- watt

Name a physical quantity, other than an electric charge, which is quantized.

Name the physical quantity associated with the rate of change of displacement with time.

Is force a scalar or a vector quantity?

Give a scientific reason for the following:
It is better to use thin blankets to keep the body warm rather than using a single blanket of thickness equal to their combined thickness.

Do all liquids exert pressure?

State whether thrust is scalar or vector.

Name the sound of the frequency given below:
40 kHz

Describe condition for
1. nuclear fission
2. nuclear fusion.

he sound of an explosion on the surface of a lake is heard by a boatman 120 m away and by a diver 120 m below the point of explosion. Out of the two persons, who would hear the sound first? Why?