Explanation

The harmonic mean is the reciprocal of the arithmetic mean of the reciprocals of the data points.

It is calculated as the inverse of the average of the inverses of the values.

Explanation

An anagram is formed by rearranging all the letters of a word to create a new word.

"Heart" → "Earth" uses the same letters in a different order, making it a valid anagram.

Explanation

Until is a subordinate conjunction that connects a dependent clause to an independent clause (e.g., "I will wait until you arrive").

At is a preposition.

And is a coordinating conjunction.

Explanation

Explanation

Metaphysics is concerned with the nature of reality, existence, and the fundamental structure of the world.

Political philosophy, deals with questions related to values like justice, rights, and freedom.

Explanation

Hidden Curriculum refers to the unwritten, unofficial, and unintended lessons, values, and perspectives that students learn in school.

It includes social norms, behaviors, and attitudes that are not explicitly taught but are acquired through interactions and the school environment.

Explanation

If two circles touch externally, the distance between their centers is equal to the sum of their radii.

This is because the circles are externally tangent, meaning the distance from one center to the other is the total length of both radii combined.

Explanation

The atomic mass of aluminum (Al) is 26.98, which is approximately 27.

This is the most common isotope of aluminum, which has an atomic number of 13.

Explanation

In December 1981, General Zia-ul-Haq announced the formation of Majlis-e-Shura as a consultative body.

It was composed of 50 nominated members from various sectors, including professionals, scholars, and technocrats.

Explanation

To find the percentage discount:

Marked price = Rs. 80

Sale price = Rs. 72

Discount = Marked price - Sale price

Discount = 80 - 72

Discount = 8

Percentage discount = (Discount / Marked price) × 100

Percentage discount = (8 / 80) × 100

Percentage discount = 10%