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NCERT Solutions Ganita Prakash (Part 2) Chapter 5 What can a Strip Say? — In-text Questions

Book page 126 Updated on2026-09-05

Q1.
What would your strip for a weekday look like? How similar or different is it to Manoj’s?
Answer

Make your own strip of 48 boxes and colour it in for yesterday, using Manoj’s six colours. Here is a sample weekday, which you should replace with your own:

TimeActivityBoxes
10:00 pm – 6:00 amSleeping16 (8 h)
6:00 – 7:00 amWashing, dressing, exercise2 (1 h)
7:00 – 7:30 amEating1
7:30 – 8:00 amTravelling1
8:00 am – 2:00 pmClasses (with a lunch break)12 (6 h)
2:00 – 2:30 pmTravelling1
2:30 pm – 10:00 pmEating, homework, family, play15 (7½ h)

Comparing with Manoj’s Friday: look at three things — when your sleep block starts and ends, how many boxes your classes take, and how many boxes are left for yourself. Many students will find they sleep less than Manoj’s 10½ hours and travel more than his 1 hour. What matters is not who has ‘more’ of anything, but that the 48 boxes are the same for everybody: every extra box for one activity is a box taken from another.

Q2.
What would a strip of your typical day during your vacation look like? How similar/different would it look?
Answer

The 48 boxes stay the same; only their colours move around.

  • The whole yellow block of classes disappears, freeing about 12 boxes (6 hours).
  • Those boxes usually turn orange — play, friends, screen time, family — and sometimes light blue, because sleep often starts later and ends later.
  • The two grey travel boxes vanish on most days, but a holiday trip can produce a strip with a huge grey block instead.
  • Meal times spread out and become less regular, so the green boxes shift about.
Try This: colour a vacation strip and a school-day strip on the same sheet, one under the other. Line up the same hour on both and you can see at a glance exactly which hours changed and which stayed put.
Q3.
What would a strip for any of the adults in your family look like? Make a strip of a day for any adult at home. Compare your strip with theirs. What do you find interesting?
Answer

Record an adult’s day in the same 48 boxes and lay the two strips side by side. Differences that usually show up:

A Grade 8 studentAn adult at home
SleepAbout 9–10 hoursUsually about 6–8 hours
Longest daytime blockClassesWork, or housework and care of the family
Free-time boxesSeveralOften only in the evening, and fewer
Shape of the dayOne long block, fixed by the school timetableOften broken into many short blocks

What is interesting: the adult’s strip is usually far more fragmented — many small blocks rather than a few long ones — because household work interrupts everything else. Work at home very often fills more boxes than paid work outside, and it rarely appears on any timetable. The strip makes that visible in a way a list never does, which is exactly what a good picture of data should do.

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