Explanation

Explanation

Metacarpal bones are the five long bones found in the hand, connecting the wrist (carpal bones) to the fingers (phalanges).

They form the structure of the palm and provide support for finger movements.

Explanation

Rusting of iron is a chemical reaction where iron reacts with oxygen and water to form iron oxide (rust).

Unlike physical changes like melting or bending, rusting involves a chemical transformation.

Explanation

The key element required for solar energy conversion in most solar cells is silicon

It is the most common semiconductor material: Silicon is used in about 95% of solar cells sold today. 

It is a naturally occurring element: Silicon is the second most abundant element on Earth, after oxygen.

Explanation

Hydroelectric power is considered the cheapest and most environmentally friendly source of electricity.

As it utilizes the energy from flowing water without emitting greenhouse gases.

Explanation

Origin of species using Natural Selection was the work of Charles Darwin.

It was published on 24 November 1859,

..

Charles Darwin's discoveries included.

four different species of giant ground sloth (some of the largest land mammals ever to have lived), a gomphothere,

and the remains of an extinct horse.

ND16-8-2023

Explanation

Iron is galvanized by coating it with zinc.

It prevents rusting and corrosion by acting as a protective barrier.

Explanation

Cyclones are usually accompanied by high rainfall.

heavy showers mean: A period of heavy rain

Cyclones mean  ایک قسم کی طوفان

heavy showers  زیادہ بارش/  بھاری بارش

ND16-3-2023

Explanation

Hydrogenation is the process by which hydrogen is used in the preparation of banaspati ghee from vegetable oil

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ND16-12-2022

Explanation

A meteoroid is a small rocky or metallic body in outer space.

Bodies that usually fall from the sky to the Earth are called Meteorites.

These are small particles from space that enter Earth's atmosphere and survive to land on its surface.