Explanation

One nautical mile per hour is equal to 1 knot.

One nautical mile is equal to 6,076 feet (1,852 meters/kilometers).

Explanation

Joseph Priestly discovered oxygen on August 1, 1774.

The most abundant element in the Earth's crust is oxygen.

It making up 46.6% of Earth's mass.

Explanation

Explanation

Carbon monoxide (CO) is a poisonous gas that is emitted from the engine of an automobile.

The smoke released from the automobile is due to the combustion of fuels like petrol and diesel.

Explanation

• Exposure to sunlight triggers the production of vitamin D in the skin.
• Specifically, ultraviolet B (UVB) rays from the sun interact with a compound called 7-dehydrocholesterol, converting it into vitamin D3 (cholecalciferol).
• Vitamin D is essential for calcium absorption, bone health, and immune system regulation.

Explanation

Explanation

CNG and Sui Gas have the same composition, primarily methane (CH₄).

Both are used as fuel for heating and vehicles.

It is used as a cleaner alternative to petrol and diesel in vehicles.

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

A tsunami is a series of powerful sea waves.

It typically caused by underwater earthquakes or volcanic eruptions.

It leading to coastal flooding.

Explanation