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Q)

# Find the number of right angles turned through by the hour hand of a clock when it goes from 1 to 10.

$(A) \; 2 \\(B)\;3 \\(C)\; 1 \\(D)\;more\;than\;3$

Angle formed between $12 \;to\;1= 30^{\circ}$
$1 \;to \;10= 30 \times 9$
$\qquad= 270^{\circ}$
$\therefore$ 3 right angle