Correct Answer: 1

Solution : The correct option is 1.

Acetone has the molecular formula C₃H₆O.

1. Carbon (C) atoms: There are 3 carbon atoms.
2. Hydrogen (H) atoms: There are 6 hydrogen atoms.
3. Oxygen (O) atoms: There is 1 oxygen atom.

Therefore, in 1 molecule of acetone (C₃H₆O), there is 1 oxygen atom.

Correct Answer: The chemist said that they did not have stock of that medicine then.

Solution : The fourth option is the correct choice.

The steps of conversion are as follows:

• There would be no change in the reporting verb in the indirect speech.
• "We" (a first-person pronoun) is changed to "they" (a third-person pronoun).
• The present tense "do not" is changed to the past tense "did not".
• "This" is changed to "that".
• The connector "that" is used to introduce the reported clause.

Therefore, the correct answer is: "The chemist said that they did not have stock of that medicine then."

Correct Answer: have never come

Solution : The third option is correct.

The subject of the sentence is "Mr. Ramesh and his friends", and when using a compound subject connected by "and", the verb should agree with the entire subject. In this case, the plural subject "Mr. Ramesh and his friends", requires the plural verb "have" instead of "has". So, the correction is to use "have" instead of "has" to ensure subject-verb agreement.

Therefore, the correct sentence is: Mr. Ramesh and his friends have never come here.

Correct Answer: 10

Solution : Here, the number given in the exact top and bottom of the star is equal to the quotient obtained from the division of the lower left and lower right corner term by the upper left and upper right term respectively.

Like, 90 ÷ 30 = 3
Similarly, follow the same pattern for 80 ÷ ? = 8 ⇒ ? = 10

So, the missing term is 10. Hence, the second option is correct.

Correct Answer: effect

Solution : The correct choice is the fourth option.

In the passage, the statement discusses the negative consequences of unanswered questions about relationships. Effect is a term commonly used to convey the idea of a result, impact, or influence. In this context, it effectively communicates that unanswered questions have a detrimental impact on relationships.

Therefore, the right word to fill in the blank is effect.

Correct Answer: precious

Solution : The correct choice is the first option.

Explanation:
Precious is the most appropriate synonym for "valuable" because both words convey the idea of something being of great worth, importance, or rarity.
The meanings of the other options are as follows:

• Commonplace: Ordinary and not special.
• Ordinary: Common and not exceptional.
• Cheap: Inexpensive or low in cost.

Therefore, the correct answer is precious.

Correct Answer: 207

Solution : Given:
A denotes addition, B denotes multiplication, C denotes subtraction, and D denotes division
27 B 3 C (11 A 3) A 14 B (100 D 10) = ?

After replacing the letters with the mathematical signs, we get:
= 27 × 3 – (11 + 3) + 14 × (100 ÷ 10)
= 27 × 3 – 14 + 14 × 10
= 81 – 14 + 140
= 207

So, 207 is the answer to the given equation. Hence, the first option is correct.

Correct Answer: ABDC

Solution : The correct answer is the second option.

Explanation: Sentence A introduces the main idea about two methods of weed removal. Sentence B expands on the easy way, suggesting the use of a lawnmower for weed removal. Sentence D contrasts with the easy way, introducing the not-so-easy way involving manual removal of weeds. Sentence C provides additional information about the not-so-easy way, emphasising its effectiveness despite being time-consuming and challenging.

Therefore, the correct answer is ABDC.

Correct Answer: Rice

Solution : The correct answer is Rice.

Magnaporthe Oryzae (Ascomycota) is the cause of rice blast disease, which affects upland and paddy crops in around 80 nations across all continents where rice is farmed. Blast disease is an economic loss factor that affects various cereal hosts, including rice, finger millet, pearl millet, foxtail millet and most recently, wheat crops. It also causes significant output losses on a global scale.

Correct Answer: (1)

Solution : The error lies in the first part of the sentence.

When describing someone's age in a comparative manner, the correct adjective is older followed by than. In this case, the comparative form of the adjective big is incorrectly used to describe someone's age as "bigger than 18 years". It should be older than 18 years instead of bigger than 18 years.

Therefore, the correct sentence should be: If you are a runner and older than 18 years, you can test your endurance level by running for the Half Marathon.