Explanation

A primary function of the kidneys is Regulation of fluids, electrolytes and acid-base balance

1. Kidneys maintain water balance.

2. They regulate electrolytes (Na⁺, K⁺, Cl⁻).

3. Control blood pH via acid-base regulation.

4. Remove metabolic wastes from blood.

5. Essential for homeostasis.

   
   

   Last updated question01  March 2026

Explanation

Vitamin D toxicity, also called hypervitaminosis D.

It causes hypercalcemia and renal failure.

Daily Vitamin D requirement is 200–600 IU.

While skin produces up to 10,000 IU after full UV exposure.

Explanation

As you move from the equator towards the poles, the latitude increases (up to 90 degrees).

The further you go from the equator in any direction,

the difference between the duration of the day and night at different times of the year will be bigger.

Additional information 

there are two points in the year when day and night are approximately equal in duration. 

This is called an equinox.

The equinoxes occur around:

• March 20th-21st 
• September 22nd-23rd each year.

Explanation

Cryptography is the art and science of keeping information secure from unintended audiences, of encrypting it.

It is also called Crytology.

The term was first introduced in 1553.

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

• 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