Explanation

In uniform circular motion, there is no angular acceleration (α = 0).

Since torque τ = Iα, and α = 0, torque is zero (τ = 0 Nm).

Explanation

A compound is a pure substance formed when two or more different elements chemically combine in a fixed ratio.

Examples include water (H₂O) and carbon dioxide (CO₂).

Explanation

"Some" is used with uncountable nouns like "coffee" when making polite offers or requests.

"Can you please give me some coffee?" is grammatically and contextually correct.

Explanation

Cellulose is the main structural component of the primary cell wall in green plants.

It provides rigidity and support to the growing plant cells.

Explanation

Sclerenchyma provides rigidity and strength, while Collenchyma offers flexible support in growing parts.

Both are considered mechanical tissues because they help maintain the structural integrity of plants.

Explanation

Sand and gravel are commonly used in filtration to remove impurities and suspended particles from water.

They provide a physical barrier and are effective in both slow and rapid sand filtration processes.

Explanation

Coagulation helps neutralize the charges on particles so they can stick together.

Flocculation follows, where these particles clump into larger flocs for easy removal—both are key in water purification.

Explanation

Self-discipline is the foundation of effective behavior and learning in a classroom.

When students and teachers both practice self-control, a positive and respectful classroom environment is maintained.

Explanation

حروف جار ایسے الفاظ ہوتے ہیں جو دوسرے لفظ کے ساتھ تعلق قائم کرتے ہیں، جیسے "سے"، "کا"، "میں" وغیرہ۔

یہ الفاظ جملے میں مخصوص معنی اور ربط پیدا کرتے ہیں۔

Explanation