The letter 'P' sounds same as the vegetable 'PEA'.

Hence P is an alphabet which is a vegetable.

Concave type of glasses are used in the headlights of the vehicles as the light from the bulb which is at focus will converges out and spreads and reflects back parallely.

Most of the water in the body will be lost by kidneys in the form of urine.

The letter 'X' resembles the same as the tool AXE in sounding.

Hence, the alphabet X is a tool.

All the above will stay where they are when they goes off. Basically anything that can swithch on or off will come under this.

Monopoly is an economic term that describes a single company or entity controlling one hundred percent of the supply of a particular product. Carnegie Steel is one of the argest monopoly of steel industry during the Gilded age.