Explanation

Fricatives are the kinds of sounds usually associated with letters such as f, s; v, z, in which the air passes through a narrow constriction that causes the air to flow turbulently and thus create a noisy sound.

Explanation

Periscopes allow a submarine, when submerged at a relatively shallow depth, to search visually for nearby targets and threats on the surface of the water and in the air.

When not in use, a submarine's periscope retracts into the hull.

Explanation

A protein is a naturally occurring, extremely complex substance that consists of amino acid residues joined by peptide bonds. Proteins are present in all living organisms and include many essential biological compounds such as enzymes, hormones, and antibodies.

Explanation

Insulators are the substances that do not allow electricity to pass through them. Examples of insulators are wax, wood, mud and plastic etc

Explanation

The first digital camera was invented by Steven Sasson, an engineer at Eastman Kodak, in 1975.

Sasson's camera used a monochrome Fairchild CCD image sensor.

It was the first self-contained electronic camera.

Explanation

The noble gases are also called inert gases sometimes as they are monoatomic and chemically inert under normal conditions.

Explanation

Sublimation is the process in which a solid change directly into a gas.

Explanation

Sun Light takes 500 seconds (8 minutes 19 seconds) to reach from the surface of the sun to the surface of the Earth.

Moonlight takes about 1.3 seconds to reach the earth's surface.

The time taken to complete one revolution of Earth around the Sun is called A year.

Explanation

Sublimation is a process in which a solid substance directly converts into its gaseous form without passing through the liquid phase.

Few of the substances which can undergo sublimation are iodine, ammonium chloride, camphor, naphthalene and carbon dioxide.

Explanation

Lipids are an umbrella term for Triglycerides, Phospholipids and Sterol.