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(a)3 to 6

(b) 2 to 8

(c) 5 to 11

(d) 10 to 1

(e) 12 to 9

(f) 12 to 6

Answer :

(a) 3 to 6 = 6 - 3 = 3 hour

In one revolution = 12 hour

No. of revolution = 3 / 12 = 1/4 revolution.

In one revolution = 4 right angle

\(\therefore \) 1/4 revolution = (1\4) × 4 = 1 right angle

(b) 2 to 8 = 8 - 2 = 6 hour

In one revolution = 12 hour

No. of revolution = 6 / 12 = 1/2 revolution.

In one revolution = 4 right angle

\(\therefore \) 1/2 revolution = (1\2) × 4 = 2 right angle

(c) 5 to 11 = 11 - 5 = 6 hour

In one revolution = 12 hour

No. of revolution = 6 / 12 = 1/2 revolution.

In one revolution = 4 right angle

\(\therefore \) 1/2 revolution = (1\2) × 4 = 2 right angle

(d) 10 to 1 I.e., 10 to 13 = 13 - 10 = 3 hour

In one revolution = 12 hour

No. of revolution = 3 / 12 = 1/4 revolution.

In one revolution = 4 right angle

\(\therefore \) 1/4 revolution = (1\4) × 4 = 1 right angle

(e) 12 to 9 I.e., 0 to 9 = 9 - 0 = 9 hour

In one revolution = 12 hour

No. of revolution = 9 / 12 = 3/4 revolution.

In one revolution = 4 right angle

\(\therefore \) 3/4 revolution = (3\4) × 4 = 3 right angle

(f) 12 to 6 = 6 - 0 = 6 hour

In one revolution = 12 hour

No. of revolution = 6 / 12 = 1/2 revolution.

In one revolution = 4 right angle

\(\therefore \) 1/2 revolution = (1\2) × 4 = 2 right angle

- Q.1 What fraction of a clockwise revolution does the hour hand of a clock turn through, when it goes from (a) 3 to 9 (b) 4 to 7 (c) 7 to 10 (d) 12 to 9 (e) 1 to 10 (f) 6 to 3
- Q.2 Where will the hand of a clock stop if it (a) starts at 12 and makes 1 / 2 of a revolution, clockwise? (b) starts at 2 and makes 1 / 2 of a revolution, clockwise? (c) starts at 5 and makes 1 / 4 of a revolution, clockwise? (d) starts at 5 and makes 3 / 4 of a revolution, clockwise?
- Q.3 Which direction will you face if you start facing (a) east and make \(\frac{1}{2} \) of a revolution clockwise? z (b ) east and make\(1\frac{1}{2} \) of a revolution clockwise? z (c) west and make \(\frac{3}{4} \) of a revolution anticlockwise? (d) south and make one full revolution? (Should we specify clockwise or anticlockwise for this last question? Why not?)
- Q.4 What part of a revolution have you turned through if you stand facing (a) east and turn clockwise to face north? (b) south and turn clockwise to face east? (c) west and turn clockwise to face east?
- Q.6 How many right angles do you make if you start facing (a) south and turn clockwise to west? (b) north and turn anti – clockwise to east? (c) west and turn to west? (d) south and turn to north?

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