Explanation

The idiom "As silent as the grave" means completely silent.

It refers to the absolute quietness associated with a grave.

Explanation

The phrase "opposed to" is the correct collocation in English.

"Opposed" is always followed by "to" when indicating resistance against something.

Explanation

The equation x = 4 represents a vertical line.

Vertical lines are always parallel to the y-axis.

Explanation

"Assure someone of something" is the correct preposition usage.

"Sincere" is the correct adjective; "sincerely" (adverb) would be incorrect here.

Explanation

A metaphor is a figure of speech that directly compares two unrelated things without using "like" or "as."

In this sentence, "That story is music to my ear" compares a story to music, implying that it is pleasant or enjoyable, without using "like" or "as."

Explanation

A horseshoe desk arrangement allows students to face both the teacher and their peers, ensuring clear visibility.

This setup promotes engagement and minimizes obstructions, making it ideal for discussions and demonstrations.

Explanation

The K orbit, also known as the first electron shell.

• It can hold a maximum of 2 electrons.

The L orbit, also known as the second electron shell.

• It can hold a maximum of 8 electrons.

The M orbit, also known as the third electron shell.

• It can hold a maximum of 18 electrons.

Explanation

Mass number = Protons + Neutrons

Given 6 protons and 6 neutrons, the mass number is 6 + 6 = 12.

Explanation

Heat transfer occurs through conduction, convection, and radiation.

Condensation is a phase change process (gas to liquid).

It is not a heat transfer method.

Explanation