Explanation

Muhammad bin Qasim, an Arab general, attacked Raja Dahir, the last Hindu king of Sindh, in 712 CE.

At that time the age of Muhammad bin Qasim was 17 years.

Raja Dahir was defeated and killed in the Battle of Aror.

Explanation

John Dewey is famous for emphasizing the practical, experiential aspect of education.

He advocated for learning through doing and education as a tool for social progress.

Explanation

Water vapor is directly related to humidity, which plays a crucial role in weather prediction. 

The amount of water vapor in the air significantly influences cloud formation, precipitation, and temperature. 

Therefore, measuring water vapor content is essential for weather forecasting. 

Explanation

By is a preposition here.

We generally use verb + ing after a Preposition.

We use "by" to explain the method of success: "He succeeded by working hard."

Explanation

Pertussis is commonly known as whooping cough. 

Explanation

Explanation

The American approach emphasizes clear learning objectives to guide teaching and assessment.

It focuses on what the student should achieve or learn by the end of instruction.

Explanation

Conjunction is a word that connects or joins clauses, words, phrases together in a sentence.

"But" is used to show contrast between two ideas — he is slow, but he is sure.

The sentence contrasts slowness with certainty.

Explanation

They do not perform Baeyer's Test statement is not true because alkynes do perform Baeyer's Test, which detects unsaturation (like double or triple bonds).

In Baeyer's Test, potassium permanganate gets decolorized if alkynes are present, indicating a reaction.

Explanation

"I don’t want to go."  is a negative sentence  indicated by the "don't"

Negative sentence examples include statements of things that are false.

In English, we create negative sentences by adding the word 'not' after the auxiliary, or helping, verb.