Question 1

What fraction of a clockwise revolution does the hour hand of a clock turn through, when it moves from 3 to 9?

Accepted Answer

The hour hand moves from 3 to 9, which covers 6 hours out of 12 hours on a clock face. The fraction is 6/12, which simplifies to 1/2 of a complete revolution.

Question 2

Where will the hand of a clock stop if it starts at 12 and makes 1/2 of a revolution, clockwise?

Accepted Answer

A complete revolution is 12 hours. Half of a revolution is 6 hours. Starting from 12 and moving 6 hours clockwise brings the hand to 6.

Question 3

What type of angle is formed when the measure of the angle is 90 degrees?

Accepted Answer

An angle whose measure is exactly 90 degrees is called a right angle.

Question 4

An angle whose measure is less than that of a right angle is called:

Accepted Answer

An angle smaller than a right angle (less than 90 degrees) is called an acute angle.

Question 5

What is the measure of a straight angle?

Accepted Answer

A straight angle is equal to 180 degrees, representing a half-turn or straight line.

Understanding Elementary Shapes — NCERT Class 6 Mathematics Important Questions & Revision Notes