Explanation

The square root of 64 is 8, i.e. √64 = 8. 

Explanation

The phrase "suggestions for improving" is the correct collocation.

Correct sentence: "The rest of the class listened carefully and gave suggestions for improving the plan."

Explanation

1 kilowatt hour (kWh) = 3.6 million joules (3.6 × 10⁶ J)

1 joule = 10⁷ ergs, so both joule and erg are much smaller than kilowatt hour.

Hence, Kilowatt hour is the biggest unit.

Explanation

Ontology is a branch of philosophy/metaphysics that studies the nature of being and existence.

It explores what kinds of things exist and how they relate to each other in reality.

Explanation

The Internet is a global network that connects millions of computers and devices worldwide.

It allows users to share information, communicate, and access services across countries and continents.

Explanation

Correct sentence: "…so that he can go on a month long tour of Europe."

"On" is used with journeys or tours.

Explanation

Biotic Components:

Living organisms (e.g., plants, animals, microbes).

Abiotic Components:

Non-living factors (e.g., sunlight, water, soil, temperature).

Explanation

"For a while" indicates a duration of time (how long the action continued).

Example: "I have been ringing the doorbell for a while."

"For" + time period = Duration (e.g., for hours, for days).

"Since" + specific time = Start point (e.g., since morning).

Explanation

Pakistani cricketer Mohammad Rizwan set up a new record for himself in Twenty20 International cricket by scoring a century in the match against South Africa, thus becoming the first-ever Pakistani wicket-keeper.

 He is also the second wicket-keeper batsman in the world to score a 100 in all three formats of international cricket.

Explanation

Length = x³ - x + 2

= (2)³ - 2 + 2

= 8 - 2 + 2

= 8

Width = x + x²

= 2 + (2)²

= 2 + 4

= 6

Area = Length * Width

= 8 * 6

= 48