Explanation

Core: Accounts for about 15% of Earth's total volume, composed mainly of iron and nickel alloys.

Mantle: Occupies 84% of Earth's volume.

Crust: Makes up 1% of Earth's volume.

Explanation

The given quadratic expression is x² - 2x + 1.

This can be factored as:

x² - 2x + 1 = (x - 1)(x - 1)

= (x - 1)²

The answer is (x - 1)(x - 1).

Explanation

The letter "b" in "doubt" is silent and not pronounced.

Silent letters are common in English and can affect spelling but not pronunciation.

Explanation

Perimeter formula for a rectangle: 2 × (Length + Width)

2 × (210 + 118) = 2 × 328 = 656 cm

Explanation

Transitional devices:

Used to connect ideas and guide readers through text smoothly.

Let's check each option:

For example → Transitional (used to give examples)

Whereas → Transitional (used to contrast)

Firstly → Transitional (used to list/sequences) 

Bunch → Not a transitional device; it's a noun

Explanation

The Simla Deputation (1906) was led by Aga Khan.

He presented Muslim demands to the British, especially for separate electorates.

Lord Minto, then Viceroy of India, welcomed the deputation positively.

It was later led to the Minto-Morley Reforms of 1909 granting Muslims separate electorates.

Explanation

Current (Ampere) is defined as the flow of electric charge per unit time.

So, 1 Ampere = 1 Coulomb/Second, meaning 1 coulomb of charge flows each second.

Explanation

Deductive Reasoning moves from general principles to specific conclusions.

Example: "All birds have feathers; a sparrow is a bird; therefore, it has feathers."

Inductive Reasoning moves from specific observations to general conclusions.

Example: "The sun rose today and yesterday; therefore, it always rises in the morning."

Explanation

Sublimation is the process where a solid directly changes into gas without becoming liquid.

Dry ice (solid CO₂) undergoes sublimation at room temperature.

Explanation

The student is the central focus of the entire education system — all planning, teaching, and evaluation are designed around their learning needs.

Modern education emphasizes learner-centered approaches, making the student the core of the system.