Question

How many times in a day, do the hands of a clock make a right angle ?

• A. $21$
• B. $22$
• C. $42$
• D. $44$

Answer 1

The correct option is D $44$

There will be $2$ times per hour when the angle between minute and hour hand is ${90}^{\circ }$

Total of $22$ times in $12$ hours.

$\therefore$ In $24$ hours, $22\times 2=44$ times the angle between minute and hour hand is ${90}^{\circ }$.