Clock Puzzles problems
- 1. How many times in a day, are the hands of a clock in straight line but opposite in direction?
Options- A. 20
- B. 22
- C. 24
- D. 48 Discuss
Correct Answer: 22
Explanation:
The hands of a clock point in opposite directions (in the same straight line) 11 times in every 12 hours. (Because between 5 and 7 they point in opposite directions at 6 o'clcok only).
So, in a day, the hands point in the opposite directions 22 times.
- 2. A clock is started at noon. By 10 minutes past 5, the hour hand has turned through:
Options- A. 145
- B. 150
- C. 155
- D. 160 Discuss
Correct Answer: 155
Explanation:
Angle traced by hour hand in 12 hrs = 360º.
Angle traced by hour hand in 5 hrs 10 min. i.e., 31/6 hrs = = 155º
- 3. A watch which gains uniformly is 2 minutes low at noon on Monday and is 4 min. 48 sec fast at 2 p.m. on the following Monday. When was it correct?
Options- A. 2 p.m. on Tuesday
- B. 2 p.m. on Wednesday
- C. 3 p.m. on Thursday
- D. 1 p.m. on Friday Discuss
Correct Answer: 2 p.m. on Wednesday
Explanation:
Time from 12 p.m. on Monday to 2 p.m. on the following Monday = 7 days 2 hours = 170 hours.
The Watch gains min. or min.in 170 hrs.
Now, min.are gained in 170 hrs.
2 min.are gained in hrs=50 hrs
Watch is correct 2 days 2 hrs. after 12 p.m. on Monday i.e., it will be correct at 2 p.m. on Wednesday
- 4. At 3.40, the hour hand and the minute hand of a clock form an angle of:
Options- A. 120 degrees
- B. 125 degrees
- C. 130 degrees
- D. 135 degrees Discuss
Correct Answer: 130 degrees
Explanation:
Angle traced by hour hand in 12 hrs. = 360º.
Angle traced by it in 11/3 hrs= =
Angle traced by minute hand in 60 min. = 360º.
Angle traced by it in 40 min. =(360/60*40) =240
Required angle (240 - 110)º = 130º.
- 5. What is two days after the day after the day before yesterday? Discuss
Correct Answer: Tomorrow The day before yesterday was two days ago; the day after the day before yesterday was yesterday; two days after that (yesterday) is tomorrow
- 6. How many minutes is it until six o?clock if fifty minutes ago it was four times as many minutes past three o?clock? Discuss
Correct Answer: Twenty-six minutes
- 7. Find at what time between 9 and 10 o?clock will the hands of a clock be in 180° ?
Options- A. 180/14 min past 10
- B. 180/11 min past 9
- C. 148/7 min past 10
- D. 154/11 min past 9 Also asked in: Bank Exams, CAT, GATE, GRE, Bank Clerk, Bank PO
Correct Answer: 180/11 min past 9
Explanation:
At 9 o?clock, the hour hand is at 9 and the minutes hand is at 12, i.e., the two hands are 15 min. spaces apart.
So, the minute hand should gain = (30 - 15) minutes = 15 minutes
55 minutes will be gained in 60 min.
15 minutes spaces will be gained in ((60/55) x 15) min. = 180/11 min.
The hands will be in the same straight line but not together i.e.,in 180 degrees at 180/11 min. past 9.
- 8. Calculate the angle between the two hands of clock when the clock shows 4 : 20 p.m. ?
Options- A. 5 degrees
- B. 10 degrees
- C. 15 degrees
- D. 25 degrees Also asked in: GRE, GATE, CAT, Bank Exams, Bank PO, Bank Clerk
Correct Answer: 10 degrees
Explanation:
Since at 4 : 20 the minute hand will be at 4 and the angle between them will be same as the distance covered in degree by the hour hand in 20 minutes.
Required angle = distance of hour hand = speed × time = × 20 =10 degrees.
- 9. 1 Billion Seconds Equals to
Options- A. 34.76 years
- B. 32.48 years
- C. 33.31 years
- D. 31.68 years Also asked in: AIEEE, Bank Exams, CAT, GATE, GRE, Analyst, Bank Clerk, Bank PO, Database Administrator, IT Trainer
Correct Answer: 31.68 years
Explanation:
We know that 1 year = 365.25 days
1 day = 24 hours
1 hour = 60 minutes
1 minute = 60 seconds
=> 1 Year = 365.25 x 24 x 60 x 60 Seconds
But 1 billion seconds = ?
1 Year = 365.25 x 24 x 60 x 60 Seconds
? = 1000000000 Seconds
= 31. 68 years.
- 10. Minute hand overlaps hour hand in 65 mins. In how many days it will gain 1440 hours ?
Options- A. 57 days
- B. 58 days
- C. 60 days
- D. 61 days Also asked in: AIEEE, Bank Exams, CAT, Bank Clerk, Bank PO
Correct Answer: 60 days
Explanation:
In this problem , it has considered that 65 mins = 1hr
So mins has increased by 5 mins so multiply 5 x 24 = 120 mins extra ,
That is now per day it adds 2hr extra, so divide 1440/26 = 59.384 days =~ 60 days.
More in Puzzles:
Programming
Copyright ©CuriousTab. All rights reserved.