Thermal | MCQs

Explanation

Three mutual conversions of energy forms occur at nuclear power plants:

nuclear energy is converted into thermal energy,

thermal energy is converted into mechanical energy,

and mechanical energy is converted into electric energy.

Explanation

Heat of vaporization is the amount of heat energy required to convert a substance from its liquid state to its gaseous state, without changing its temperature.

This energy is used to break the intermolecular forces between the molecules, allowing them to escape into the gas phase.

Explanation

Diamond is an excellent conductor of heat due to strong covalent bonding and crystal structure.

It is a strong electrical insulator because it lacks free electrons to carry current.

Explanation

Radiation transfers heat through electromagnetic waves and does not require a medium.

For example, the Sun's heat reaches Earth through radiation.

Explanation

Insulators are materials that resist the flow of heat (and also electricity), such as wood, rubber, or plastic.

They are used to prevent heat loss or protect from heat transfer.

Explanation

When current flows through a bulb, electrical energy is converted into both heat and light energy.

The filament inside the bulb heats up due to resistance (Joule heating) and emits light as a result.

Explanation

 Ice blocks are covered with sawdust primarily to provide necessary insulation from heat, preventing them from melting quickly. 

Explanation

Explanation

Copper has the highest thermal conductivity (386 K m-1 K-1)

Copper has high thermal conductivity.

AGM 25-12-2022

Explanation

Reforming is a process used in petroleum refining to separate hydrogen from hydrocarbons through heat.

It helps convert lower-quality hydrocarbons into more valuable products like gasoline and hydrogen.