Quantitative Aptitude · Reasoning

Time and Clocks

491 Questions

Time and clocks problems evaluate quantitative aptitude by testing concepts on clock gains, losses, and relative speeds of hands. Questions also cover global time zones and standard time calculations. These logical reasoning topics frequently appear in SSC and banking exams.

Clock gain or lossTime zonesAngle between handsStandard time calculationPrecise time measurement

Time and Clocks Questions

Multiple choice maths measuring time time in 24 hour clock time difference time

A watch which gains uniformly was observed to be 5 minutes slow at 12 noon on a Sunday. On the subsequent Wednesday at 6:00 p.m., it was noticed that the watch was 5 minutes fast. When did the watch show the correct time?

  1. On Monday at 12 noon

  2. On Monday at 3:00 a.m,

  3. On Tuesday at 3:00 a.m.

  4. On Tuesday at 12 midnight

  5. None of these
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Since the watch is  5 minutes slow at 12 noon on a Sunday and 5 minutes fast on the subsequent Wednesday at 6:00 p.m, it will show the right time at a time exactly mid way of theses 2 times.
hours passed=24+24+24+6=78hrs
mid way will be 39hrs after Sunday noon, which will be 3:00 a.m. tuesdsay.

Multiple choice maths measuring time time in 24 hour clock time difference time

A clock is set to show the correct time at 12:00 noon. Immediately, due to some mechanical defect, both the minute hand and the hour hand started moving in the reverse direction (anticlockwise direction). What is the correct time when this clock shows 8:25?

  1. $4:25$
  2. $3:25$
  3. $7:25$
  4. $7:35$
  5. $3:35$
Reveal answer Fill a bubble to check yourself
E Correct answer
Explanation

When the hands are moving anticlockwise, we can assume that the time shown is the mirror image of actual time.
Assume that there is a line drawn between 12 and 6 on the clock, this can be a line of symmetry.
When we take the mirror image of this clock, the hands that are on the right side of this line will appear equidistant on the left side of the line and vice versa.
The time indicated is 8:25, the hour mid way after 8 and the minute hand on 5.
Its mirror image will become, the hour mid way before 4 and the minute hand on 7, i.e, 3:35.

Multiple choice maths measuring time time in 24 hour clock time difference time

The minute and hour hands of a clock overlap every 60 minutes of correct time. How much does the clock lose or gain in a day?

  1. $130 \displaystyle \frac{10}{11}$ minutes
  2. $58 \displaystyle \frac{6}{7}$ minutes
  3. $143 \displaystyle \frac{5}{11}$ minutes
  4. $139 \displaystyle \frac{4}{11}$ minutes

  5. None of these
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

In a correct clock, the minute hand gains 55 min. spaces over the hour hand in 60 minutes.

To be together again, the minute hand must gain 60 minutes over the hour hand.

55 minutes are gained in 60 min.

60 min. are gained in [(60/55) * 60] min = $65\frac { 5 }{ 11 } $min.

Therefore, loss in 60 minutes =  $65\frac { 5 }{ 11 } -60=5\frac { 5 }{ 11 } $ min.

Loss in 24 hours = $5\frac { 5 }{ 11 } *\frac { 24*60 }{ 60 } $ = $130\frac { 10 }{ 11 } $min.

Therefore, the clock loses $130\frac { 10 }{ 11 } $ minutes in 24 hours.

Multiple choice maths measuring time time in 24 hour clock time difference time

A clock loses 5 seconds every hour. If the clock is set on Sunday at 12 noon, then what is the correct time the following Saturday, if the clock shows 12, midnight (give answer to the nearest minute)?

  1. II:53 p.m. on Saturday

  2. 11:47 p.m. on Saturday

  3. 00: 13 a.m. on Sunday

  4. 11: 52 p.m. on Saturday

  5. None of these
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Let the hours passed be $x$,
time shown on $clock 1=12:00 a.m$ saturday $(24*6+12hrs)$
$3600x-5x=156*60*60$,
$x=156.21hrs=156hrs$ and $13mins$
actual time $=12:13 a.m.$ saturday.

Multiple choice maths measuring time time in 24 hour clock time difference time

The minute hand of a clock overtakes the hour hand at intervals of 65 minutes. How much in a day does the clock gain or lose?

  1. Gains $\displaystyle 56 \frac{8}{77}$ minutes
  2. Loses $\displaystyle 32 \frac{8}{11}$ minutes
  3. Loses $\displaystyle 9 \frac{10}{143}$ minutes
  4. Gains $\displaystyle 10 \frac{9}{143}$ minutes
  5. Gains $\displaystyle 10 \frac{10}{143}$ minutes
Reveal answer Fill a bubble to check yourself
E Correct answer
Explanation

In a correct clock, the minute hand gains 55 min. spaces over the hour hand in 60 minutes.

To be together again, the minute hand must gain 60 minutes over the hour hand.

55 minutes are gained in 60 min.

60 min. are gained in [(60/55) * 60] min = $65\dfrac { 5 }{ 11 } $min.

But they are together after 65 min.

Therefore, gain in 65 minutes =  $65\dfrac { 5 }{ 11 } -60=\dfrac { 5 }{ 11 } $ min.

Gain in 24 hours = $\dfrac { 5 }{ 11 } * \dfrac { 24*60 }{ 65 } $ = 1440/143 min.

Therefore, the clock gains $(10 + 10/143 )$ minutes in $24$ hours.

Multiple choice physics properties of waves longitudinal and transverse waves travelling waves types of waves

A man sets his watch by the noon whistle of a factory at a distance of $1.5 km.$ Then the number of seconds his watch slower than the clock of the factory (velocity of sound $= 332 m/s$) is 

  1. $4.52 sec$
  2. $5.35 sec$
  3. $2.18 sec$
  4. $3.76 sec$
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

time taken for the whistle to reach the person is $\dfrac{d}{v}$
$=\dfrac{1.5\times 1000}{332}=4.52sec$
$\therefore$ delay of his clock is $4.52s$

Multiple choice physics superposition of waves coherence young's double slit experiment interference

The time of coherence is of the order of

  1. $10^{-4}s$
  2. $10^{-8}s$
  3. $10^{-6}s$
  4. $10^{-2}s$
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

In a light source, a light wave(photon) is produced when an excited atom goes to the ground state and emits light.

The duration of this transition is $10^{-8}s$. Thus the emitted wave remains sinusoidal for this much time. This time is known as coherence time($\tau _c$).

Multiple choice physics superposition of waves coherence young's double slit experiment interference

The time of coherence is of the order of 

  1. $10^{-4}s$
  2. $10^{-8}s$
  3. $10^{-6}s$
  4. $10^{-2}s$
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

In a light source(photon) is produced when an excited atom goes to the ground state and emits light.

The duration of the transition is about $10^{-8}s$. Thus the emitted light remains sinusoidal for this much time. This is called the coherence time($\tau _c$).

Multiple choice maths calculating and mental strategies 3 finding percentage of a number how many in all? problems on percentage

What percentage of a day is six hours and 45 minutes?

  1. 7.218%

  2. 8.3%

  3. 28.125%

  4. None of these
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

A day is 24hrs.
 six hours and 45 minutes=
$6\frac { 45 }{ 60 } =6\frac { 3 }{ 4 } =\frac { 27 }{ 4 } Hrs$
So, % of a day=
$=\frac { 27 }{ 4*24 } \times 100$
$=\frac { 27 }{ 4*24 } \times 100=28.13%$
Answer (C) 28.125%

Multiple choice geography tides movements of ocean and sea water circulation of ocean water ocean water movement

What is the time interval of every high and low tide?

  1. 5 hour 25 minutes

  2. 6 hours 25 minutes

  3. 10 hour 25 minutes

  4. 12 hour 25 minutes
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

On an average, every place experiences high and low tide a day at an time interval of 12 hours 25 minutes. Since the earth completes its rotation in roughly 24 hours, every place should experience tide after 12 hours but this never happens. Each day tide delayed by 25 minutes because the moon also rotates on its axis while revolving around the earth. 

Multiple choice maths problems on measurement basic operations with same units operations involving units of length calculations choosing and converting between units conversion between different units conversion between units

Write following $12$ hour times into $24$ hour times.
$7:43$ pm

  1. $7:43$
  2. $19:43$
  3. $19:43$ pm
  4. $19:43$ am
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

To change a $pm$ time to $24$ hours time , you have to add $12 \ \ pm$ to the hours unless it is $12\ \ pm$ then the time remain unchanged .

$7:43\ \ pm=(7+12):43=19:43$
option $B$ is correct.

Multiple choice history heritage management conservation and preservation of heritage sources of modern history introduction to medieval india

Indian system views time in a _______ manner.

  1. Cyclic

  2. Linear

  3. Flexible

  4. None of them
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

The manner in which the Indian system views time is cyclic. It is also referred to as Kalachakra. When one chakra completes, another starts. The completion of one of its cycle is known as Yuga. In this way, history has Yugas such as Tretayuga, Dwaparyuga etc.

Thus, the correct answer is A.