Explanation

A rectifier is an electrical device that converts alternating current (AC),

which periodically reverses direction, to direct current (DC), which flows in only one direction.

Explanation

The distance traveled by a body in unit time is called the speed of the body.

S.I. unit of speed is meter per second (ms−1).

ND11623

Explanation

Radiocarbon dating is a method for determining the age of an object containing organic material by using the properties of radiocarbon, a radioactive isotope of carbon.

Explanation

Short-sightedness is caused due to elongation of the eyeball

 It also may result when the curve of the cornea is too steep. 

The messages sent from the retina to the brain are perceived as blurry

Explanation

• Structure of DNA was discovered by James Watson and Francis Crick in 1953.
• They discovered the double-helix structure of DNA using X-ray crystallography data.
• Their discovery revealed the double-helix structure of DNA, where two complementary strands are twisted together with sugar and phosphate molecules, and the nitrogenous bases (adenine, thymine, cytosine, and guanine) pair in a specific manner.

Explanation

The epidermis and its waxy cuticle provide a protective barrier against mechanical injury, water loss, and infection.

Explanation

 Evaporation occurs when particles at the exposed surface of a liquid absorb just enough energy to pull away from the liquid and escape into the air.

Explanation

The wind is used to produce electricity by converting the kinetic energy of air in motion into electricity.

Wind energy is the energy obtained from the force of the wind.

The unit of wind is: joule

ND27-7-2023

Explanation

Earthworms and amphibians, such as frogs, breathe through their skin. 

Explanation

The ozone layer is a thin part of the Earth's atmosphere that absorbs almost all of the sun's harmful ultraviolet light.

Ozone is made of O3.