Technically only once. But if measurements are made clockwise and anticlockwise then twice.
24 I think. Since every hour, there will be 2. For example, the first time after 12 O'clock is between 12:13 and 12:14. For your info, every minute, the minute hand moves 6 degrees and the hour hand moves 0.5 degree.
At 6:30, the hour hand is at 195 degrees, the minute hand is at 180 degrees, the second hand would be at 0 degrees. The hour and minute hands would also be 15 degrees apart.
90 degrees
15 degrees. Minute hand is pointing to the 6 and the hour hand halfway between 6 and 7, which themselves are 30 deg apart.
A clock makes a zero degree angle twice a day. This occurs when the hour and minute hands align perfectly, typically at 12:00 (noon) and 12:00 (midnight). At these times, the hands form a straight line, representing a zero degree angle.
90
5.75 degrees.
60 degrees
It rotates 25*360 = 9000 degrees.
190 degrees is bit more than a straight angle. If you look at a clock face with the minute hand at 312/3 minutes, then going from 12 o'clock to the minute hand makes an angle of 190 degrees.
20 degrees
All of them (from zero degrees to 360 degrees), as the hands spin around.
22.5 degrees
At 6:30, the hour hand is at 195 degrees, the minute hand is at 180 degrees, the second hand would be at 0 degrees. The hour and minute hands would also be 15 degrees apart.
One minute is six degrees. Multiply however many minutes the hands are apart by six.
12 minutes is 1/5th of an hour. The minute hand sweeps 360 degrees - a full circle - in one hour. So the angle formed by the start and stop of a 12-minute sweep of the minute hand would be 1/5th of 360 degrees or 72 degrees.
Every minute is six degrees. At 7:30, the hour hand has moved halfway between the 7 and 8. Call it 15 degrees.
At exactly 1 o'clock, the hour hand will be at an angle of 30 degrees, and the minute and second hands will be at an angle of 0 degrees.