Explanation

• Mercury is mostly made up of iron.
• It's surface covered with craters.
• It has no atmosphere and no moons.
• It's closest to the sun.
• It's smallest planet.

Explanation

The skin is considered the largest organ of the human body.

It covering an area of about 1.5-2 square meters (16-22 square feet).

It weighing around 3-4 kilograms (7-9 pounds).

Explanation

Explanation

Sirius is the brightest star in the night sky.

Sirius means صبح کا ستارہ 

Explanation

The telescope is undoubtedly the most important investigative tool in astronomy.

A celestial body that revolves around a planet is known as a natural satellite.

Explanation

• Fission is the splitting of a nucleus that releases free neutrons and lighter nuclei.
• The fission of heavy elements is highly exothermic which releases about 200 million eV compared to burning coal which only gives a few eV.

Explanation

The air in Earth's atmosphere is made up of approximately 78 percent nitrogen and 21 percent oxygen.

Explanation

The rod cells of the retina are responsible for vision in dim light or at night (scotopic vision),

Providing black and white, low-resolution vision, and contributing to peripheral vision.

They are more numerous and more sensitive to light than cone cells, but they cannot detect color or fine details. 

Explanation

A device that opposes the flow of electrons in electronic circuits is called a resistor.

It is a passive two-terminal component used to reduce current flow, divide voltage, and perform other functions by creating resistance.

Resistance is measured in ohms (Omega). 

Explanation

Penguins are the birds which do not fly but swim to go from one place to another.

Penguins have flippers which help them swim underwater.

Penguin means پنکھ دار بحری پرندہ