What is the landform in the image?
hill
mountain
plain
plateau

I think it's (B)Mountain.

Explanation:

A hill is round, so not that. A plain is flat out land and a plateau is also flat so all you have left with is mountain.

Option (2)

Explanation:

The mountains are defined as the huge landforms that covers a large area extending above the surrounding topography, usually forming a mountain-top. They are comparatively steeper and are difficult to climb. They normally have a height more than about 2000 meters above the mean sea level. These mountains are formed due to the continuous motion of tectonic plates over the layer of asthenosphere. The high mountains are comprised of permanent ice caps at its summit that provides the water into the river through out the year.

Hence, the correct answer is option (2).

found in the nucleus

has mass of one amu