Unit Test (Solutions): Racing Seconds | Mathematics (Maths Mela) Class 5 - New NCERT PDF Download

Time: 1 hour

M.M. 30

Attempt all questions.

• Question numbers 1 to 5 carry 1 mark each.
• Question numbers 6 to 8 carry 2 marks each.
• Question numbers 9 to 11 carry 3 marks each.
• Question number 12 & 13 carry 5 marks each

Q1.  What is the time in 12-hour format if the 24-hour clock shows 14:30?  (1 Mark)
(a) 2:30 a.m.
(b) 2:30 p.m.
(c) 4:30 p.m.
(d) 4:30 a.m.

Ans: (b) 2:30 p.m.

Q2. Which of the following represents 12 midnight in 24-hour clock format?  (1 Mark)
(a) 00:00
(b) 12:00
(c) 24:00
(d) 12:00 p.m.

Ans: (a) 00:00

Q3. A bus leaves the station at 7:20 a.m. and reaches at 10:50 a.m. How long was the journey?  (1 Mark)
(a) 2 hours 30 minutes
(b) 3 hours 30 minutes
(c) 3 hours 20 minutes
(d) 2 hours 20 minutes

Ans: (b) 3 hours 30 minutes

Q4. What is the time in 24-hour clock if it is 9:45 p.m.?  (1 Mark)
(a) 19:45
(b) 21:45
(c) 20:45
(d) 22:45

Ans: (b) 21:45

Q5. If a train departs at 11:55 p.m. and arrives at 01:25 a.m., how long does it take?  (1 Mark)
(a) 1 hour 10 minutes
(b) 1 hour 20 minutes
(c) 1 hour 25 minutes
(d) 1 hour 30 minutes

Ans: (b) 1 hour 30 minutes

Q6: Convert 24-Hours Clock to 12-Hours Clock (2 Marks)

(a) 05:45
Given time is 05:45.
Since it is less than 12:00, it remains the same.
Answer: 05:45 a.m.

(b) 13:25
Given time is 13:25.
Convert into 12-hour clock: 13:25 – 12:00 = 01:25
Answer: 01:25 p.m.

(c) 22:10
Given time is 22:10.
Convert into 12-hour clock: 22:10 – 12:00 = 10:10
Answer: 10:10 p.m.

(d) 12:00
Given time is 12:00.
12:00 in 24-hour clock = 12:00 noon.
Answer: 12:00 p.m.

Q7: A flight leaves Delhi at 11:30 PM (12-hour format) and lands in Dubai at 02:15 (24-hour format) the next day. How long is the flight? (2 Marks)

Solution:

• Departure (12-hour → 24-hour) = 23:30

• Arrival next day = 02:15 → Add 24 hours to next-day time = 26:15

• Subtract: 26:15 – 23:30 = 2 hours 45 minutes

Answer: The flight takes 2 hours 45 minutes.

Q8: A movie starts at 10:45 AM (12-hour format) and ends at 13:20 (24-hour format). How long does the movie last? (2 Marks)

Solution:

• Start time in 24-hour format = 10:45

• End time = 13:20

• Subtract: 13:20 – 10:45 = 2 hours 35 minutes

Answer: The movie lasts 2 hours 35 minutes.

Q9: Write the time using A.M.–P.M. conversion (3 Marks)

(a) 3 hours past 04:00 a.m.
= 04:00 a.m. + 3 hours = 07:00 a.m.

(b) 1 hour past 7:00 p.m.
= 07:00 p.m. + 1 hour = 08:00 p.m.

(c) 25 minutes past 11:40 a.m.
= 11:40 a.m. + 25 minutes = 12:05 (crosses noon) = 12:05 p.m.

Note: When time passes 12:00 noon, the suffix changes from a.m. to p.m.

Q10: In each pair, tick the time which comes earliest in the day. (3 Marks)Solution:

Q11: A train leaves Chennai at 9:05 PM (12-hour format) and reaches Bengaluru at 00:40 (24-hour format). How long is the journey? (3 Marks)

Solution:

• Departure = 21:05

• Arrival next day = 00:40 → 24:40

• Subtract: 24:40 – 21:05 = 3 hours 35 minutes

Answer: The train journey is 3 hours 35 minutes.

Q12: Complete the table by filling, the missing times  (5 Marks)Solution:

Q13: Read the clock carefully and answer.  (5 Marks)

Solution:

​​​​​