Clock - General Questions (3)

17.

A clock is started at noon. By 10 minutes past 5, the hour hand has turned through:

Answer: Option C

Explanation:

Angle traced by hour hand in 12 hrs = 360°.

Angle traced by hour hand in 5 hrs 10 min. i.e.,	31	hrs =		360	x	31		°	= 155°.
	6			12		6

18.

The reflex angle between the hands of a clock at 10.25 is:

Answer: Option D

Explanation:

Angle traced by hour hand in	125	hrs =		360	x	125		°	= 312	1	°	.
	12			12		12				2

Angle traced by minute hand in 25 min =		360	x 25		°	= 150°.
		60

Reflex angle = 360° -		312	1	- 150		°	= 360° - 162	1	°	= 197	1°	.
			2					2			2

19.

An accurate clock shows 8 o'clock in the morning. Through how may degrees will the hour hand rotate when the clock shows 2 o'clock in the afternoon?

Answer: Option D

Explanation:

Angle traced by the hour hand in 6 hours = 1-sym-oparen-h1 360x 6 1-sym-cparen-h1 °= 180°.12