Explanation

The Ionosphere reflects and refracts radio waves, enabling long-distance communication.

It plays a crucial role in radio transmission and satellite communication.

Explanation

Rickets is caused by a vitamin D, calcium, or phosphate deficiency,

It leading to soft and weak bones.

It primarily affects children.

It causing bone deformities and growth delays.

Explanation

Explanation

• The Suez Canal is the largest man-made canal in the world.
• It is located in Egypt.
• It connects the Mediterranean Sea to the Red Sea. 
• The canal was officially opened on November 17, 1869.
• As it drastically reduced the time taken for ships to travel from Europe to Asia.

Explanation

Explanation

Apples have a low glycemic index (GI) and are rich in fiber.

It helps regulate blood sugar levels.

They are a healthier fruit option for diabetics compared to high-sugar fruits like bananas or mangoes.

Explanation

Explanation

Narita International Airport is located near Tokyo, Japan.

It is one of the country's major international airports.

It serves as a key hub for international travel to and from Japan.

Explanation

1. Pipe A fills the tank in 15 minutes (rate = $\frac{1}{15}$ per minute).

2. Pipe B fills the tank in 20 minutes (rate = $\frac{1}{20}$ per minute).

3. Combined rate: $\frac{1}{15}+\frac{1}{20}=\frac{7}{60}$ per minute.

4. Time taken together: $\frac{1}{\frac{7}{60}}=\frac{60}{7}$ minutes.

Explanation

The Dead Sea is the saltiest body of water in the world.

It has a salinity of 33.7%.