Explanation

Uncertain means غیر یقینی

Sure means یقینا

Explanation

BARBARIAN means غیر مہذب، جنگلی، وحشی یا پھر جاہل

Uncivilized means بے سلیقہ

Explanation

"Rainfall" is uncountable, so we use "has" not "have."

Correct sentence → There has been heavy rainfall yesterday.

Explanation

The phrase should be “a good friend of mine”, not of me.

"Mine" is the correct possessive pronoun used after “of” in this context.

Explanation

"Give in" means to surrender or yield, which fits the commander’s refusal.

The sentence shows determination — despite being outnumbered, he did not surrender.

Explanation

Ambition is considered a passion because it continuously drives a person to achieve more.

Passions, unlike ideas or fancies, are never fully satisfied as they grow with each achievement.

Explanation

Plasma is the fourth state of matter, following:

1. Solids
2. Liquids
3. Gases

It consists of ionized gases with equal numbers of positively and negatively charged particles.

Explanation

Most molecular crystals melt below 200°C.

Molecular crystals are composed of discrete molecules held together by weak intermolecular forces,

Such as van der Waals forces, dipole-dipole interactions, and hydrogen bonds.

Because these forces are weak, they require relatively little energy to overcome, resulting in low melting and boiling points.

Therefore, their melting points are typically well below 300°C, and often below 200°C, unlike ionic or metallic crystals, which have much stronger bonds and higher melting points

Explanation

The induced fit model of enzyme activity suggests that an enzyme can catalyze related reactions.

The enzyme's active site can undergo conformational changes to accommodate and catalyze similar substrates.

It enhancing the enzyme's versatility.

Explanation

The path of a charged particle in a plane perpendicular to a uniform magnetic field is Circular. 

When a charged particle enters a magnetic field perpendicularly,

The magnetic force acts perpendicular to its velocity,

This causes it to continuously change direction, resulting in a circular path.