Physics

Processes that require or give off heat will be limited to changes of state, known as phase changes, and changes in chemical constitution, or chemical reactions. Changes of state involve a solid melting, a liquid freezing, a liquid boiling or a gas condensing._x000D_ An exothermic process is one that gives off heat, which is transferred to the surroundings. An endothermic process is a reaction which heat has to be supplied to the system from the surroundings._x000D_ Here in all the given options, heat is taken away from them to change there phase._x000D_ Liquid to Solid — Freezing_x000D_ Gas to Liquid — Condensation_x000D_ Gas to Solid — Deposition_x000D_ are all examples of exothermic processes

Vehicle tyres are inflated properly to avoid skidding and to minimise friction.

Natural radioactivity was discovered by Henri Becquerel.

Rotameter is used to measure flow of fluids.

Gamma rays can cause Gene mutation.

When an object reaches the ground it has its maximum value of kinetic energy just before touching the ground. Since kinetic energy + potential energy= Constant; so on reaching ground the potential energy of an object becomes zero (0). The kinetic energy on reaching ground becomes maximum.

When a tyre bursts suddenly energy is not immediately transferred between the system and the surrounding. So the process is adiabatic. There sudden expansion of its air into the atmosphere is adiabatic and the tyre is cooled. In adiabatic process, heat neither enters the system nor leaves the system.

Henry is the unit of Magnetic Induction.

If the angle of incidence of light ray in the denser medium is greater than the critical angle of the concerned media pair, the light is not at all reflected in to the rarer medium but is totally reflected. This is known as ‘total internal reflection’.