Daily NEET MCQ- September 15, 2022 - NEET MCQ

Lithium and magnesium are harder than other metals in the group because they have a strong metallic bond among themselves. This is one of the similarities between Lithium and magnesium having a diagonal relation.

Both lithium chloride (LiCl) and magnesium chloride (MgCl) are predominantly covalent when compared to other elements in their respective groups, that is alkali metals and alkaline earth metals.

Electronegativity of Lithium is 1.0 and the electronegativity of magnesium as 1.2, they have almost similar electronegativities which is one of the reasons for Lithium and Magnesium’s diagonal relationship.

PE = m x g x h
m = 10 kg
g = 10 m/s²
h = 20 m
PE = 10 x 10 x 20
= 2000 J.

Maximum height reached by the object;
h = v²/(2 x g)
= 25/20
= 1.25 m
PE = m x g x h
= 2 x 10 x 1.25
= 25 J.

PE = m x g x h
The mass of the given object is constant.
The fixed reference indicates constant acceleration due to gravity.
Hence, variation in height (h) is nothing but a variation in position.
Hence, the potential energy of an object of constant mass and fixed reference is determined by its position.

Eukaryotic cells possess a true nucleus. Plants, fungi and protists are eukaryotic organisms as they have a well – defined nucleus. However, monerans do not possess a well – defined nucleus and are thus, prokaryotes.

Eukaryotic organisms have a well – defined nucleus. The nucleus is surrounded by a nuclear envelope. The various organelles are membrane bound. However, only prokaryotic organisms possess mesosomes.

Plants cells are differentiated from animal cells on the basis of the presence of certain organelles such as plastids, cell wall and a large central vacuole. Only animal cells possess centrioles in their cytoplasm.

The structure of the cell membrane was studied in detail in the 1950s after the advent of the electron microscope. The cell membrane is a phospholipid bilayer containing various proteins in its structure.