Explanation

Stainless steel is a alloys that contain a minimum of approximately 11% chromium, a composition that prevents the iron from rusting and also provides heat-resistant properties.

Explanation

A microphone converts sound into a small electrical current.

Sound waves hit a diaphragm that vibrates, moving a magnet near a coil.

In some designs, the coil moves within a magnet.

Other microphones, such as condenser microphones, work on the principle of capacitance.

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Explanation

Lack of insulin causes diabetes.

Diabetes is a condition that happens when your blood sugar (glucose) is too high.

It develops when your pancreas doesn't make enough insulin.

Explanation

• The shortest distance between two points is called displacement.
• Displacement is a measure of the straight-line distance between two points.
•  It is a scalar quantity.

Key Point: The longest distance between two points is called the circumference (if the points are on a circle) or a diagonal (if the points are on a polygon or a rectangle).

Explanation

Vector Quantities: Velocity, momentum, torque, acceleration.

Scalar Quantities: Work, distance, speed, mass.

Explanation

COVID-19 is caused by a virus, specifically the SARS-CoV-2 virus.

The first infections with SARS-CoV-2 appeared in Wuhan in 2019.

Explanation

• The largest component of natural gas is methane
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• Natural Gas is also known as Methane.
• The principal use of methane is as a fuel.
• Natural gas also contains smaller amounts of natural gas liquids (NGLs, which are also hydrocarbon gas liquids)
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• Largest natural gas producer country in the world Russia
•  Russia is home to the world's largest natural gas reserves, with a total proved resource of 38 TCM

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Explanation

Trachoma is a disease of the eye

It is caused by infection with the bacterium Chlamydia trachomatis.

It is a public health problem in 38 countries and is responsible for the blindness or visual impairment of about 1.9 million people

Explanation

Goiter is caused by iodine deficiency.

It results in an enlarged thyroid gland.

Iodine deficiency can cause mental retardation in children.

Particularly if the deficiency occurs during fetal development or early childhood.

This is because iodine is essential for brain development and thyroid function.

The effects of the thyroid come from two iodine-containing hormones.

Explanation

Marconi invented Radio.

Radio was invented in 1895.

Guglielmo Marconi was an Italian inventor. 

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