General Science Questions

A chemical reaction in which involves the absorption of heat from the environment is called a Endothermic reaction. 

Examples : Dissolving ammonium chloride in water, photosynthesis, melting ice cubes, mixing of potassium chloride with water,...

In the contrast, chemical reactions involving release of heat are known as exothermic reactions.

Examples : Combustion, coal is burnt, mix of CaO with water,...

The head mirror used by ENT doctors is concave.

Mortar is a mixture of cement or lime as a binder, sand and water.

The main source of organic matter in soil is the plant and animal tissue that decompose at each level of breakdown.

The nutrients that provide energy are carbohydrates, proteins and vitamins. The other three nutrients--vitamins, minerals, and water do not provide energy.

Short term side effects of alcohol and other drugs include forgetfulness, temporary blindness and disrupted sleep.

The Indian Navy operates three operational Commands. They are

1. Western Naval Command - Mumbai

2. Eastern Naval Command  - Vishakhapatnam

3. Southern Naval Command - Kochi

In all the above given options, there is no chemical change or reactions takes place only the shape or physical state is changed.