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.