The DAV Maths Book Class 8 Solutions Pdf and DAV Class 8 Maths Chapter 13 Worksheet 2 Solutions of Introduction to Graphs offer comprehensive answers to textbook questions.
DAV Class 8 Maths Ch 13 WS 2 Solutions
Question 1.
The following table gives the temperature at 12:00 noon on seven successive days in Delhi.
| Day (October) | 1 | 2 | 3 | 4 | 5 | 6 | 7 |
| Temp. (in °C) | 14 | 18 | 16 | 13 | 19 | 20 | 17 |
Plot a graph to show this information.
Solution:
Scale on x-axis: 1 day = 1 cm
Scale on y-axis: 5°C = 1 cm
Question 2.
The quantity of petrol filled in a bike and the cost of petrol are given in the following table:
| Litres of Petrol Filled | 5 | 8 | 10 | 15 |
| Cost of Petrol | 250 | 400 | 500 | 750 |
Draw a graph to show this information.
Solution:
Scale on the x-axis: 5 units = 2 cm
Scale on the y-axis: 100 units = 1 cm
Question 3.
The temperature of a patient, admitted to the hospital with viral fever, at different times of the day is given below. Draw the temperature-time graph to represent the data:
| Time (in hours) | 6:00 | 8:00 | 10:00 | 12:00 | 14:00 |
| Temp. (in °F) | 101 | 102 | 103 | 104 | 100 |
Solution:
Scale on x-axis: 1 hr = 1 cm
Scale on y-axis: 1° = 1 cm
Question 4.
A bus is going on a long journey starting at 4:00 hour. The speed of the bus at different hours is given below:
| Time (in hours) | 4:00 | 6:00 | 8:00 | 10:00 | 12:00 | 14:00 |
| Speed (in km/hr) | 30 | 50 | 60 | 45 | 80 | 70 |
Draw a speed-time graph for the above data.
Solution:
Scale on the x-axis: 1 hr = 1 cm
Scale on the y-axis: 10 km/hr = 1 cm
Question 5.
The following table shows the amount of wheat grown by Heera in different years:
| Years | 1995 | 1996 | 1997 | 1998 | 1999 | 2000 |
| Wheat grown (in quintals) | 240 | 220 | 160 | 250 | 270 | 300 |
Plot a graph to illustrate this information.
Solution:
Scale on x-axis: 1 year = 2 cm
Scale on y-axis: 100 quintal = 2 cm
DAV Class 8 Maths Chapter 13 Value Based Questions
Question 1.
Given below is the number of saplings planted by the Eco-Club members of a school in different years.
| Year | 2010 | 2011 | 2012 | 2013 | 2014 | 2015 |
| Number of saplings | 10 | 20 | 30 | 15 | 35 | 25 |
(i) Plot a graph for this information.
(ii) What other activities can be taken by Eco-Club members? Name anyone.
(iii) What value of the Eco-Club members is depicted here?
Solution:
(i) Scale on x-axis, 1 unit = 1 year
Scale on the y-axis, 1 unit = 5 saplings
(ii) Say no to plastic bags, reduce the use of electricity, and take care of animals, birds, plants, etc.
(iii) Eco-Club members take care of the environment.