Q1: Check it is a leap year or not?
(i) 2012
Ans:
2012 is divisible by 4, so it is a leap year.
(ii) 2009
Ans:
2009 is not divisible by 4, so it is not a leap year.
Q2: Draw the hands of the clocks to show the time:
(i) 10:05
Ans:
(ii) 5:15
Ans:
(iii) 11:40
Ans:
(iv) 1:40
Ans:
(v) 4:45
Ans:
Q3: Write down the time shown by each of the following clocks:
(i) 1:15
Ans:
(ii) 10:25
Ans:
(iii) 4:00
Ans:
Q4: Write the time using a.m. or p.m. :
(i) 10 minutes after midnight
Ans: 12:10 A.M.
(ii) 5:45 in the evening
Ans: 5:45 P.M.
(iii) 12:10 in the afternoon
Ans: 12:10 P.M.
(iv) 11:50 in the morning
Ans: 11:50 A.M.
(v) 5:35 in the morning
Ans: 5:35 A.M.
(vi) 12:05 during the night
Ans: 12:05 A.M.
(vii) 8:15 in the morning
Ans: 8:15 A.M.
(viii) 4:10 in the evening
Ans: 4:10 P.M.
Q5: Write a.m. or p.m. in the given blank spaces to make the sentences correct:
(i) Piyush comes back from school at 2:00
Ans: P.M.
(ii) Shilpa cleans her teeth at 6:30
Ans: A.M.
(iii) You take your lunch at 1:00
Ans: P.M.
(iv) Divya goes to school at 7:30
Ans: A.M.
Q6: What time will it be:
(i) 3 hours after 11:10 p.m.?
Ans: 2:10 A.M.
Calculation: 11:10 p.m. + 3 hours = 11:10 + 1 h → 12:10 a.m., +1 h → 1:10 a.m., +1 h → 2:10 a.m.
(ii) 2 hours after 10:00 p.m.?
Ans: 12:00 A.M.
Calculation: 10:00 p.m. + 2 hours = 12:00 a.m. (midnight).
(iii) 2 hours before 1:30 p.m.?
Ans: 11:30 A.M.
Calculation: 1:30 p.m. – 2 hours = 11:30 a.m.
(iv) 2 hours after 7:35 a.m.?
Ans: 9:35 A.M.
Calculation: 7:35 a.m. + 2 hours = 9:35 a.m. (correcting the earlier p.m. mention).
(v) 4 hours before 3:00 a.m.?
Ans: 11:00 P.M.
Calculation: 3:00 a.m. – 4 hours = 11:00 p.m. (the previous night).
Q7: Convert the following into seconds:
Note: 1 hour = 60 minutes and 1 minute = 60 seconds
(i) 32 minutes
Work: 32 × 60 = 1920
Ans: 1920 seconds
(ii) 12 minutes
Work: 12 × 60 = 720
Ans: 720 seconds
Q8: Answer the following questions:
(i) Manvar started dreaming at 11:50 p.m. His dream lasted for 40 minutes. When did his dream end?
Ans: 12:30 A.M.
Calculation: 11:50 p.m. + 10 minutes = 12:00 a.m.; remaining 30 minutes → 12:30 a.m. So the dream ended at 12:30 A.M.
(ii) Shinde started playing volleyball at 4:45 p.m. He played for 1 hour 15 minutes. When did he stop playing?
Ans: 6:00 P.M.
Calculation: 4:45 p.m. + 1 hour = 5:45 p.m.; + 15 minutes = 6:00 p.m.
(iii) A ferry boat started to sail at 11:30 a.m. It completed the journey at 3:10 p.m. How long did it sail?
Ans: 3 hours 40 minutes
Calculation: 11:30 a.m. to 2:30 p.m. = 3 hours; 2:30 p.m. to 3:10 p.m. = 40 minutes; total = 3 hours 40 minutes.
(iv) Ragini started her dance practice at 5:40 p.m. and stopped it at 7:10 p.m. How long did she practice?
Ans: 1 hour 30 minutes
Calculation: 5:40 p.m. to 6:40 p.m. = 1 hour; 6:40 p.m. to 7:10 p.m. = 30 minutes; total = 1 hour 30 minutes.
Q9: How many minutes are in 1 hour?
(a) 60
(b) 120
(c) 50
(d) 30
Ans: (a)
Explanation: There are 60 minutes in 1 hour because 1 minute is 1/60th of an hour. Therefore, 60 minutes make one whole hour.