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Quantitative Aptitude

CLOCK MCQs

Total Questions : 223 | Page 6 of 23 pages
Question 51.

At what time, in minutes, between 3 oclock and 4 oclock, both the needles will coincide each other?

  1.    \(5\frac{1}{11}\)
  2.    \(12\frac{4}{11}\)
  3.    \(13\frac{4}{11}\)
  4.    \(16\frac{4}{11}\)
 Discuss Question
Answer: Option D. -> \(16\frac{4}{11}\)

At 3 o'clock, the minute hand is 15 min. spaces apart from the hour hand.


To be coincident, it must gain 15 min. spaces.


55 min. are gained in 60 min.


15 min. are gained in \(\left(\frac{60}{55}\times15\right)min. = 16\frac{4}{11}min.\)


So, The hands are coincident at \(16\frac{4}{11}min. past 3\)

Question 52.

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

  1.    20
  2.    21
  3.    22
  4.    24
 Discuss Question
Answer: Option C. -> 22

The hands of a clock coincide 11 times in every 12 hours (Since between 11 and 1, they coincide only once, i.e., at 12 o'clock).


AM


12:00
1:05
2:11
3:16
4:22
5:27
6:33
7:38
8:44
9:49
10:55


PM


12:00
1:05
2:11
3:16
4:22
5:27
6:33
7:38
8:44
9:49
10:55


The hands overlap about every 65 minutes, not every 60 minutes.


  So, The hands coincide 22 times in a day.

Question 53.

How many times in a day, the hands of a clock are straight?

  1.    22
  2.    24
  3.    44
  4.    48
 Discuss Question
Answer: Option C. -> 44

In 12 hours, the hands coincide or are in opposite direction 22 times.


So, In 24 hours, the hands coincide or are in opposite direction 44 times a day.

Question 54.

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?

  1.    2 p.m. on Tuesday
  2.    2 p.m. on Wednesday
  3.    3 p.m. on Thursday
  4.    1 p.m. on Friday
 Discuss Question
Answer: Option B. -> 2 p.m. on Wednesday

Time from 12 p.m. on Monday to 2 p.m. on the following Monday = 7 days 2 hours = 170 hours.


So, The watch gains \(\left(2+4\frac{4}{5}\right)min. or \frac{34}{5}min. in 170 hrs\)


Now, \(\frac{34}{5}\)  min. are gained in 170 hrs.


So, 2 min. are gained in \(\left(170\times\frac{5}{34}\times2\right)hrs= 50 hrs.\)


So,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.


 

Question 55. 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?
  1.    144º
  2.    150º
  3.    168º
  4.    180º
 Discuss Question
Answer: Option D. -> 180º
Question 56. The reflex angle between the hands of a clock at 10.25 is:
  1.    180º
  2.    $${\text{192}}{\frac{1}{2}^ \circ }$$
  3.    195º
  4.    $${\text{197}}{\frac{1}{2}^ \circ }$$
 Discuss Question
Answer: Option D. -> $${\text{197}}{\frac{1}{2}^ \circ }$$
Question 57. A clock is started at noon. By 10 minutes past 5, the hour hand has turned through:
  1.    145º
  2.    150º
  3.    155º
  4.    160º
 Discuss Question
Answer: Option C. -> 155º
Question 58. A watch which gains 5 seconds in 3 minutes was set right at 7 a.m. In the afternoon of the same day, when the watch indicated quarter past 4 o'clock, the true time is:
  1.    $$59\frac{7}{{12}}$$ min. past 3
  2.    4 p.m.
  3.    $$58\frac{7}{{11}}$$ min. past 3
  4.    $$2\frac{3}{{11}}$$ min. past 4
 Discuss Question
Answer: Option B. -> 4 p.m.
Question 59. How much does a watch lose per day, if its hands coincide every 64 minutes?
  1.    $$32\frac{8}{{11}}$$ min.
  2.    $$36\frac{5}{{11}}$$ min.
  3.    90 min.
  4.    96 min.
 Discuss Question
Answer: Option A. -> $$32\frac{8}{{11}}$$ min.
Question 60. At what time between 7 and 8 o'clock will the hands of a clock be in the same straight line but, not together?
  1.    5 min. past 7
  2.    $$5\frac{2}{{11}}$$ min. past 7
  3.    $$5\frac{3}{{11}}$$ min. past 7
  4.    $$5\frac{5}{{11}}$$ min. past 7
 Discuss Question
Answer: Option D. -> $$5\frac{5}{{11}}$$ min. past 7

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