Explanation

Diamond is a solid form of pure carbon with its atoms arranged in a crystal.

Explanation

1 g of fat provides 37 kJ of energy on oxidation while

1 g of carbohydrate on oxidation gives 17 kJ of energy.

Hence, fat has the highest calorific value.

Explanation

A normal resting heart rate should be between 60 to 100 beats per minute.

Explanation

Antoine Henri Becquerel was an engineer, physicist, Nobel laureate,

First person to discover evidence of radioactivity.

 He belonged to France.

Explanation

Explanation

• When a gas turns into liquid, the process is called condensation
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• Condensation - gas to liquid.
• If a gas is cooled, its particles will eventually stop moving about so fast and form a liquid.
• This is called condensation and occurs at the same temperature as boiling.

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Explanation

Lithium is the lightest metal.

It has the lowest density of all metals.

This making it the least dense metal element.

Explanation

The retina is a thin layer of tissue that lines the back of the eye on the inside.

It is located near the optic nerve.

The purpose of the retina is to receive light that the lens has focused,

convert the light into neural signals,

and send these signals on to the brain for visual recognition

Explanation

Rene Laennec, a French physician, invented the stethoscope in 1816.

He created the first stethoscope using a wooden tube that allowed him to listen to the heart and lungs of a patient without placing his ear on their chest.

Explanation

• Air is a mixture of different gases.
• Primarily consisting of nitrogen (78%), oxygen (21%), and trace amounts of other gases.