Explanation

Electrolysis, which uses electricity as a catalyst, is the process of separating water (H2O) into oxygen (O2) and hydrogen (H2).

When an electric current is passed through water, it causes the water molecules to split into their component gases.

Explanation

To simplify the expression, we need to follow the order of operations (PEMDAS):

• Divide 4 by 2: 4 ÷ 2 = 2
• Multiply 2 by 3: 2 × 3 = 6
• Subtract 6: 6 - 6 = 0
• Add 2: 0 + 2 = 2

So, the correct answer is: 2

Explanation

The sentence should read: "The old woman lived alone, with no one to look after her."

بوڑھی عورت اکیلی رہتی تھی، اس کی دیکھ بھال کرنے والا کوئی نہیں تھا۔

This indicates she had no one to care for her.

Explanation

Hepatitis C is a liver infection caused by the hepatitis C virus. 

Hepatitis C is often described as “acute,” meaning a new infection, or “chronic,” meaning long-term infection.

Explanation

The weather this winter has been windy, wet, and unpredictable is the correctly punctuated sentence.

It correctly uses commas to separate the items in the list.

Explanation

The sentence mentions the Amazon river in Brazil and its position in South America.

Definite article "the" is used before "Amazon" because it is a specific river that the sentence is referring to.

The indefinite article is not used before "South America" because it is a general reference to the continent, and not a specific one.

Therefore, the correct sentence is "The Amazon in Brazil is the longest river in South America."

Explanation

He succeeded to the throne after his father's death.

وہ اپنے والد کی وفات کے بعد تخت نشین ہوا۔

The phrase "succeeded to the throne" means to take over the position or title, following the death of the previous holder.

Explanation

Hyder knew the conditions in England like the back of his hand.

The phrase "like the back of his hand" means Hyder was very familiar with the conditions in England.

As one knows the back of their own hand well.

Explanation

Zulfikar Ali Bhutto returned to Pakistan on 18 December 1971.

On 20 December, he took over as President and Chief Martial Law Administrator from Yahya Khan.

Bhutto served as President from December 1971 to August 1973.

Bhutto served as Prime Minister from August 1973 to July 1977.

Explanation

Twitter is a prime example of microblogging, where users share short messages (called "tweets") of up to 280 characters.

Microblogging involves brief, frequent posts, and Twitter's character limit and real-time nature make it an ideal platform for this style of communication.