The DAV Class 4 Maths Solutions and DAV Class 4 Maths Chapter 8 Brain Teasers Solutions of Time and Calendar offer comprehensive answers to textbook questions.
DAV Class 4 Maths Ch 8 Brain Teasers Solutions
Question 1.
Tick (✓) the correct answer.
(a) 3 hrs 33 min = ________ min.
(i) 333
(ii) 213
(iii) 180
(iv) 210
Answer:
(ii) 213
(b) Today is Monday. After 61 days it will be-
(i) Wednesday
(ii) Saturday
(iii) Tuesday
(iv) Thursday
Answer:
Today is Monday then after every 7 days it will be Monday so we have to divide by 7.
= 8y mean after five day of Monday
i.e. Saturday so option (ii)
(c) Which of the following months has 30 days?
(i) July
(ii) December
(iii) October
(iv) April
Answer:
(iv) i.e. April
(d) A train leaves Delhi at 12:05 p.m. At what time will it reach Agra, if the journey takes 3 hrs 42 minutes?
(i) 1:37 p.m.
(ii) 1:47 p.m.
(iii) 3:47 p.m.
(iv) 4:37 p.m.
Answer:
Time of departure = 12 hrs 05 min
Time to reach Agra = 3hrs 42 min
15:47 or 3:47 p.m.
so option (iii)
(e) The number of days in two non-leap years is-
(i) 720
(ii) 732
(iii) 722
(iv) 730
Answer:
(iv) i.e. 730 days. (365 × 2 = 730)
Question 2.
Is the year in which India became Republic, a leap year?
Answer:
India became Republic in 1950
Divide it by 4
So, it was not a leap year.
Question 3.
If 4th of February is a Sunday, what day is 25th of February?
Answer:
4th Feb — Sunday so, every 7th day is Sunday.
11th Feb — Sunday
18th Feb — Sunday
25th Feb — Sunday
Question 4.
Fill in the blanks.
(a) A leap year has ________ days.
Answer:
366
(b) There are ________ seconds in one hour.
Answer:
3600
(c) The shortest month of a year is ________.
Answer:
February
(d) 5 hours = ________ minutes.
Answer:
300 minutes
(e) 3 hours 35 minutes = ________ minutes.
Answer:
215 minute
(f) 1 century = ________ years.
Answer:
100
(g) 180 minutes = ________ hours.
Answer:
3
(h) 3 hours after 5 p.m. is ________.
Answer:
8 p.m.
(i) 2 hours before 9 a.m. is ________.
Answer:
7 a.m.
(j) 2 hrs 20 min after 3:30 a.m. is ________
Answer:
5: 50 a.m.
(k) 4 hrs 5 min before 10:40 a.m. is ________
Answer:
6:35 a.m.
Question 5.
Find the sum:
(a) 3 hrs 15 min and 5 hrs 20 min
Answer:
8hrs 35 min
(b) 6 hrs 47 min and 45 min
Answer:
7 hrs 32 min
Question 6.
Find the difference between:
(a) 6 hrs 40 min and 5 hrs 5 min
Answer:
1 hr 35 min
(b) 3 hrs 47 min and 55 min
Answer:
2 hrs 52 min
Question 7.
What time was it 3600 seconds before 12 midnight?
Answer:
As 3600 sec = 1 hr
11: 00 p.m.
Question 8.
What time will it be 3600 seconds after 11 a.m. ?
Answer:
3600 sec = 1 hr
12: 00 noon
Question 9.
A. T.V. was switched on at 7:30 p.m. and switched off at 11:45 p.m. How long did it run?
Answer:
T.V. was switched on at 7:30 p.m.
T.V. was switched off at 11:45 p.m.
Duration of T.V. run = 4hrs15min
4 hrs 15 min.
Question 10.
Renu studied for 1 hour 25 minutes. If she stopped studying at 8:30 p.m., when did she start studying?
Answer:
Duration of study = 1hr 25 min
Stopped studying = 8: 30 p.m
She starts studying at 7: 05 p.m
Question 11.
Find the names of the famous personalities whose date of birth is 29 February.
Answer:
Moraraji Desai, Rukmani Devi.
Additional Questions
Question 1.
Which of the following are leap years?
(a) 2009
(b) 1996
(c) 2014
(d) 2015
Answer:
(b) 1996
It is a leap year
(a) 2009
It is not a leap year
(c) 2014
It is not a leap year
(d) 2015
It is not a leap year
Question 2.
Fill in the blanks:
(a) 5 days = ________ hours.
Answer:
120 (24 × 5 = 120)
(b) 3 decades = ________ years.
Answer:
30
(c) 10 years = ________ month.
Answer:
120
(d) 3600 second = ________ hour.
Answer:
1
(e) 1 hour = ________ minutes.
Answer:
60
Question 3.
Find the sum:
(a) 6 hrs 5 min and 5 hrs 20 min.
Answer:
(b) 9 hrs 15 min and 35 min.
Answer:
(c) 3 hrs and 2 hrs 15 min.
Answer:
(d) 10 hrs and 3 hrs 7 min.
Answer:
(e) 5 hrs and 45 min and 6 hrs 55 min.
Answer:
Question 4.
Find the difference?
(a) 3 hrs 25 min and 6 hrs 15 min.
Answer:
2 hrs 50 min
(b) 9 hrs 28 min and 7 hrs 35 min.
Answer:
1 hr 53 min
(c) 5 hrs 25 min and 55 min.
Answer:
4 hrs 30 min.
Question 5.
What time will it be?
(a) 4 hrs before 5:30 p.m.?
Answer:
1: 30 p.m
(b) 2 hrs after 8:20 p.m.?
Answer:
10:20 p.m
(c) 2 hrs before 2:30 p.m.?
Answer:
12:30 p.m
(d) 5 hrs after 11:30 a.m.?
Answer:
4:30 p.m