Explanation

The biggest hydropower plant in Pakistan is located at Tarbela.

The Tarbela Dam, on the Indus River.

It has the largest installed capacity among Pakistan's hydropower facilities.

Explanation

He gave a lecture in which he pointed out an error in the book.

انہوں نے ایک لیکچر دیا جس میں انہوں نے کتاب میں ایک خامی کی نشاندہی کی۔

Point out is a phrasal verb that means to draw attention to something or identify something, especially an error, issue, or important detail.

Explanation

If everything goes according to schedule, work will be complete in December.

اگر سب کچھ شیڈول کے مطابق ہوا تو دسمبر میں کام مکمل ہو جائے گا۔

 According to the schedule is a common and correct phrase that means things are happening as planned or on time.

Explanation

I came across an old friend in Islamabad this morning.

آج صبح اسلام آباد میں ایک پرانے دوست سے ملاقات ہوئی۔

The phrase "came across" means to encounter or find something or someone unexpectedly.

Here, it indicates meeting an old friend by chance.

Explanation

 She always keeps on watching dramas.

وہ ہمیشہ ڈرامے دیکھتی رہتی ہے۔

"Watching" is correct

The phrase "keeps on" is a phrasal verb meaning to continue doing something, and it's always followed by a verb in the -ing form (called a gerund).

Explanation

The transistor is a semiconductor device with at least three terminals.

These terminals are typically referred to as the :

• Emitter
• Base
• Collector

They allow the transistor to control the flow of electrical signals and power. 

Explanation

 I found my car keys in my pocket.

مجھے اپنی کار کی چابیاں اپنی جیب میں مل گئیں۔

We use "in" for something inside an enclosed space — a pocket is an enclosed area.

 "In" is the correct preposition 

Explanation

The ratio of hydrogen to oxygen by mass in water is always 1:8. 

This ratio is derived from the atomic masses of hydrogen (approximately 1 g/mol) and oxygen (approximately 16 g/mol) in the water molecule (H₂O),

Where there are two hydrogen atoms and one oxygen atom.

Therefore, the mass ratio is (2 * 1) : 16, which simplifies to 2:16 or 1:8. 

Explanation

The pH of acid rain is less than 5.6. 

Normal rain is slightly acidic due to the dissolution of carbon dioxide from the atmosphere.

It forms weak carbonic acid and typically has a pH of around 5.6

When the pH drops below this value, it is classified as acid rain.

Primarily caused by pollutants like sulfur dioxide and nitrogen oxides, according to the EPA. 

Explanation

The writer of the autobiography of Sania Mirza is Sania Mirza with Imran Mirza and Shivani

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The name of the autobiography of Sania Mirza is Ace Against Odds 

The publisher of the autobiography of Sania Mirza is HarperCollins India

The publication date of  the autobiography of Sania Mirza is July 2016

The language of the autobiography of Sania Mirza is English