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Clocks

1.

A Clock is started at Noon, by 10 minutes past 7, the hour hand has turn through:

Answer: A

In a clock, 12 hours form 360° degree. So one hour forms 30°. Therefore 7 hours form 210° (30° X 7) degree. In a minute, hour hand moves 0.5° degree, so in 10 minutes it moves 0.5° X 10 = 5°
Thus, by 10 Minutes past 7, hour hand has turn through 210° + 5° = 215°

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2.

At what time between 7.02 and 8.02 will the hands of a watch be in the straight line but no together?

Answer: B

When the hands of the clock are in the same straight line but not 
together, they are 30 minute spaces apart.
At 7 o'clock, they are 25 min. spaces apart. 
Minute hand must gain only 5 min. space
55 min. spaces are gained in 60 min.
5 min. spaces are gained in (60/55 × 5) min = 5 (5/11) min. 
Required time = 5 (5/11) min. past 7.

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3.

At what time between 7.02 and 8.02 will the hands of a watch be in the straight line but no together?

Answer: B

When the hands of the clock are in the same straight line but not
together, they are 30 minute spaces apart.
At 7 o'clock, they are 25 min. spaces apart.
Minute hand must gain only 5 min. space
55 min. spaces are gained in 60 min.
5 min. spaces are gained in (60/55 × 5) min = 5 (5/11) min.
Required time = 5 (5/11) min. past 7.

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4.

At what time between 5.30 & 6 will the hands of a watch be at right angle?

Answer: A

At 5 o'clock, the hands are 25 min. spaces apart.
To be at right angles and that too between 5.30 and 6, the minute hand must gain 40 min
55 min. spaces are gained in 60 min.
40 min. spaces would be gained in (60/55 × 40) min. = 43 7/11 min.
Required time = 43(7/11) min. past 5.

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5.

At what time, in moment, between 3 o'clock and 4 o'clock, both are unnecessary will match one another?

Answer: D

At 3 o'clock ,the moment hand is 15 min. spaces a section
Structure the hour hand. To be coincident,
it must pick up 15 min. spaces.
55 min. are picked up in 60 min.
15 min. are picked up in (60/55*15)min.=180/11 min.
∴ The hands are correspondent at 180/11 min. past 3.

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6.

How many times are the hands of a clock at right angles in 24 hours?

Answer: B

In 12 hours, they are at right angles 22 times.
In 24 hours, they are at right angles 44 times.

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7.

At what time between 9.13 and 10.12 will the hands of a watch be together?

Answer: B

To be together between 9 and 10 o'clock, the minute hand must gain 45 min. space
55 min. spaces are gained in 60 min.
45 min spaces would be gained in (60/55 × 45) min. or 49 1/11 min.
The hands are together at 49 1/11 min. past 9.

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8.

A watch which pick up consistently is 2 minutes moderate at twelve on Monday What's more, is 4 min.48 sec quick at 2 p.m. on the next Monday. At the point when Is it true that it was right?

Answer: B

Time structure 12 p.m. on Monday to 2 p.m. on the accompanying
Monday =7 days 2 hours =170 hours.
∴ The watch gains(2+24/5)min.
on the other hand 34/5 min. in 170 hrs.
Now,34/5 min. are picked up in 170 hrs.
∴ 2 min. are picked up in (170(5/34*2) hrs=50 hrs.
Along these lines, the watch is right 2 days 2 hour after 12 p.m. on
Monday i.e.it will be right at 2 p.m. on Wednesday.

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9.

At 3:40, the hour hand and the minute hand of a clock form an angle of:

Answer: C

No answer description available for this question.

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10.

How many times do the hands of the clock coincide in a day?

Answer: A

No answer description available for this question.

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