Understanding Elementary Shapes 5.2
Full exercise on Understanding Elementary Shapes, fully solved. This is a video tutorial for 6th class NCERT students. For other educational stuff, subscribe and press bell icon.
The turn from north to east is by a right angle. The turn from north to south is by two right angles; it is called a straight angle. Turning by two straight angles (or four right angles) in the same direction makes a full turn. This one complete turn is called one revolution. The angle for one revolution is a complete angle.
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
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 makes3/4 of a revolution, clockwise?
3. Which direction will you face if you start facing
(a) east and make1/2 of a revolution clockwise?
(b) east and make 1and 1/2 of a revolution clockwise?
(c) west and make 3/4 of a revolution anti-clockwise?
(d) south and make one full revolution?
(Should we specify clockwise or anti-clockwise for this last question? Why not?)
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?
5. Find the number of right angles turned through by the hour hand of a clock when it goes from
(a) 3 to 6 (b) 2 to 8 (c) 5 to 11
(d) 10 to 1 (e) 12 to 9 (f) 12 to 6
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?
7. Where will the hour hand of a clock stop if it starts
(a) from 6 and turns through 1 right angle?
(b) from 8 and turns through 2 right angles?
(c) from 10 and turns through 3 right angles?
(d) from 7 and turns through 2 straight angles?
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