Explanation

The formula for the sum of interior angles of a polygon is:

(n - 2) × 180°

For an 8-sided polygon (n = 8):

Sum of interior angles = (8 - 2) × 180°

= 6 × 180°

= 1080°

Since it's a regular polygon, all interior angles are equal:

Measure of each interior angle = 1080°/8

= 135°

Explanation

A point source of pollution refers to a fixed or stationary location, like a factory chimney or wastewater outlet.

It contrasts with mobile sources (like vehicles) or diffuse sources (like agricultural runoff).

Explanation

Epistemology is the branch of philosophy concerned with the nature, sources, and limits of knowledge — asking questions like “How do we know what we know?”

It explores concepts such as belief, truth, justification, and how knowledge is acquired and validated.

Explanation

Assessment for Learning refers to Formative Assessment, which is conducted during the learning process to monitor student progress.

It helps teachers adjust instruction and provides feedback to improve student performance.

Explanation

Isopropyl alcohol is used to precipitate DNA during extraction from sources like bananas or strawberries.

When added to the mixture, DNA becomes visible as it separates out in the cold alcohol layer.

Explanation

Telstar was the first TV relay satellite launched into space by the United States on July 10, 1962.

It enabled the first transatlantic television transmission, revolutionizing global communication.

Explanation

RNA contains Uracil instead of Thymine, which is found in DNA.

The four bases in RNA are Adenine (A), Uracil (U), Guanine (G), and Cytosine (C).

Explanation

Naming words are nouns — names of people, animals, places, or things.

Pen, car, rabbit are all nouns, making them the correct group of naming words.

Explanation

"Reign" means the rule or period of power of a king or queen — matches the meaning of the sentence.

It is the correct homophone (same sound, different meaning/spelling) for this royal context.

Explanation

When zinc reacts with dilute sulfuric acid, it forms zinc sulfate (ZnSO₄) and releases hydrogen gas (H₂).

The reaction is:

Zn + H₂SO₄ → ZnSO₄ + H₂↑