# Clocks and Calendars Quiz Set 23

### Question 1

Three comets appear in the sky at regular periods of 14, 28 and 42 years respectively. If a comet has passed just now, what is the minimum time that we must wait for a comet to appear in the sky?

A

14 years.

B

43 years.

C

42 years.

D

28 years.

Soln.
Ans: a

The least of the given time periods is 14. So this is the minimum waiting time.

### Question 2

Three comets appear in the sky at regular periods of 5, 10 and 15 years respectively. If a comet has passed just now, what is the minimum time that we must wait for a comet to appear in the sky?

A

5 years.

B

16 years.

C

15 years.

D

10 years.

Soln.
Ans: a

The least of the given time periods is 5. So this is the minimum waiting time.

### Question 3

Kirat remembers that picnic with Sara is after Aug 20 but before Aug 25, but Radhika remembers that it is between 22 and 24 Aug. What is the correct date, if both of them remember well?

A

23.

B

24.

C

22.

D

25.

Soln.
Ans: a

Probable dates according to Kirat are 21; 22; 23; 24; Probable dates according to Radhika are 23; The common date is: 23.

### Question 4

Which of the following ears is not a leap year?

A

2000.

B

1200.

C

700.

D

1600.

Soln.
Ans: c

As 700 is not exactly divisible by 400, so 700 is not leap year.

### Question 5

Three comets appear in the sky at regular periods of 10, 20 and 30 years respectively. If a comet has passed just now, what is the minimum time that we must wait for a comet to appear in the sky?

A

10 years.

B

31 years.

C

30 years.

D

20 years.

Soln.
Ans: a

The least of the given time periods is 10. So this is the minimum waiting time. 