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NCERT solutions Mathematics Textbook for Class 8 chapter 15 Introduction to Graphs

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Chapter 15 - Introduction to Graphs

Pages 236 - 239

The following graph shows the temperature of a patient in a hospital, recorded every hour.

1) What was the patient’s temperature at 1 p.m.?

2) When was the patient’s temperature 38.5°C?

3) The patient’s temperature was the same two times during the period given. What were these two times?

4) What was the temperature at 1.30 p.m.? How did you arrive at your answer?

5) During which periods did the patients’ temperature showed an upward trend?

Q 1 | Page 236 |

The following line graph shows the yearly sales figures for a manufacturing company.

1) What were the sales in (a) 2002 (b) 2006?

2) What were the sales in (a) 2003 (b) 2005?

3) Compute the difference between the sales in 2002 and 2006.

4) In which year was there the greatest difference between the sales as compared
to its previous year?

Q 2 | Page 237 |

For an experiment in Botany, two different plants, plant A and plant B were grown under similar laboratory conditions. Their heights were measured at the end of each week for 3 weeks. The results are shown by the following graph.

1) How high was Plant A after (a) 2 weeks (b) 3weeks?

2) How high was Plant B after (a) 2 weeks (b) 3weeks?

3) How much did Plant A grow during the 3rd week?

4) How much did Plant B grow from the end of the 2nd week to the end of the 3rd week?

5) During which week did Plant A grow most?

6) During which week did Plant B grow least?

7) Were the two plants of the same height during any week shown here? Specify.

Q 3 | Page 237 |

The following graph shows the temperature forecast and the actual temperature for each day of a week.

1) On which days was the forecast temperature the same as the actual temperature?

2) What was the maximum forecast temperature during the week?

3) What was the minimum actual temperature during the week?

4) On which day did the actual temperature differ the most from the forecast temperature?

Q 4 | Page 238 |

Use the tables below to draw linear graphs

The number of days a hill side city received snow in different years.

Year 2003 2004 2005 2006
Days 8 10 5 12 
Q 5.1 | Page 238 |

Use the tables below to draw linear graphs.

Population (in thousands) of men and women in a village in different years.

Year 2003 2004 2005 2006 2007
Number of men 12 12.5 13 13.2 13.5
Number of women 11.3 11.9 13 13.6 12.8 
Q 5.2 | Page 238 |

A courier-person cycles from a town to a neighboring suburban area to deliver a parcel to a merchant. His distance from the town at different times is shown by the following graph.

1) What is the scale taken for the time axis?

2) How much time did the person take for the travel?

3) How far is the place of the merchant from the town?

4) Did the person stop on his way? Explain.

5) During which period did he ride fastest?

Q 6 | Page 239 |

Can there be a time temperature graph as follows? Justify you’re answer:

Q 7.1 | Page 239 |

Can there be a time-temperature graph as follows? Justify your answer

Q 7.2 | Page 239 |

Can there be a time-temperature graph as follows? Justify your answer

Q 7.3 | Page 239 |

Can there be a time temperature graph as follows? Justify you’re answer:

Q 7.4 | Page 239 |

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