{"id":28002,"date":"2021-07-02T16:43:30","date_gmt":"2021-07-02T11:13:30","guid":{"rendered":"https:\/\/ncertsolutions.guru\/?p=28002"},"modified":"2021-07-02T16:43:30","modified_gmt":"2021-07-02T11:13:30","slug":"ncert-solutions-for-class-8-maths-chapter-15-ex-15-1","status":"publish","type":"post","link":"https:\/\/ncertsolutions.guru\/ncert-solutions-for-class-8-maths-chapter-15-ex-15-1\/","title":{"rendered":"NCERT Solutions for Class 8 Maths Chapter 15 Introduction to Graphs Ex 15.1"},"content":{"rendered":"

These NCERT Solutions for Class 8 Maths<\/a> Chapter 15 Introduction to Graphs Ex 15.1 Questions and Answers are prepared by our highly skilled subject experts.<\/p>\n

NCERT Solutions for Class 8 Maths Chapter 15 Introduction to Graphs Exercise 15.1<\/h2>\n

Question 1.
\nThe following graph shows the temperature of a patient in a hospital recorded every hour.
\n(a) What was the patient\u2019s temperature at 1 p.m?
\n(b) When was the patients temperature 38.5\u00b0C?
\n\"NCERT
\n(c) The patients temperature was the same two times during the period given. What were these two times?
\n(d) What was the temperature at 1.30 p.m.? How did you arrive at your answer?
\n(e) During which periods did the patients\u2019 temperature showed an upward trend?
\nAnswer:
\n(a) The patient\u2019s temperature at 1 p.m. was 36.5\u00b0C.
\n(c) The patient\u2019s temperature was same at 1 p.m and 2 p.m.
\n(d) The patient temperature at 1.30 was 36.5\u00b0C because the temperature of the patient was constant, (ie 36.5\u00b0C) from 1 p.m to 2 p.m)
\n(e) The temperature of patient showed an upward trend during 9 a.m to 10 a.m to 11 a.m and 2 p.m. to 3 p.m.<\/p>\n

\"NCERT<\/p>\n

Question 2.
\nThe following line graphs shows the yearly sales figures for a manufacturing company.
\n(a) What were the sale in (i) 2002
\n(ii) 2006?
\n(b) What were the sales in (i) 2003
\n(ii) 2005?
\n(c) Compute the difference between the sales in 2002 and 2006.
\n(d) In which year was there the greatest difference between the sales as compared to its previous year?
\n\"NCERT
\nAnswer:
\n(a) (i) Company\u2019s sale in 2002 was \u20b9 4 crores
\n(ii) Company\u2019s sale in 2006 was \u20b9 8 crores
\n(b) (i) Company\u2019s sale in 2003 was \u20b9 7 crores
\n(ii) Company\u2019s sale in 2005 was \u20b9 10 crores
\n(c) Difference in sales between 2002 and 2006
\n= \u20b9 8 crores – \u20b9 4 crores = \u20b9 4 crores
\n(d) In 2005, there was the greatest difference between the sales as compared to its previous year 2004.<\/p>\n

Question 3.
\nFor 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.
\n\"NCERT
\n(a) How high was Plant A after
\n(i) 2 weeks (ii) 3 weeks?
\n(b) How high was Plant B after (i) 2 weeks
\n(ii) 3 weeks?
\n(c) How much did Plant A grow during the 3rd week?
\n(d) How much did Plant B grow from the end of the 2nd week to the end of the 3rd week?
\n(e) During which week did Plant A grow most?
\n(f) During which week did Plant B grow least?
\n(g) Were the two plants of the same height during any week shown here? Specify.
\nAnswer:
\n(a) (i) After two weeks, the plant A was 7 cm high.
\n(ii) After three weeks, the plant A was 9 cm high
\n(b) (i) After two weeks, the plant B was 7 cm high.
\n(ii) After three weeks, the plant B was 10 cm high.
\n(c) During the 3rd week, the plant A grew 2 cm (9 cm – 7cm)
\n(d) The plant B grew 3 cm (10 cm – 7cm) from the end of 2nd week to the end of 3rd week.
\n(e) The growth of the plant A
\nDuring the 1st week 2cm (2 cm – 0 cm).
\nDuring the 2nd week = 5cm (7 cm – 2 cm).
\nDuring the 3rd week = 2 cm (9 cm – 7 cm).
\nDuring the 2nd week, the plant A grew the most.
\n(f) The growth of the plant B
\nDuring the 1st week = 1 cm (1 cm – 0 cm) During the 2nd week = 6 cm (7 cm – 1 cm)
\nDuring the 3rd week = 3 cm (10 cm – 7 cm)
\n(g) Both the plants have shown the same height at the end of the 2nd week.<\/p>\n

\"NCERT<\/p>\n

Question 4.
\nThe following graph shows the temperature forecast and the actual temperature for each day of a week.
\n\"NCERT
\n(a) On which days was the forecast temperature the same as the actual temperature?
\n(b) What was the maximum forecast temperature during the week?
\n(c) What was the minimum actual temperature during the week?
\n(d) On which day did the actual temperature differ the most from the forecast temperature?
\nAnswer:
\n(a) The forecast temperature was the same as the actual temperature on Tuesday, Friday and Sunday.
\n(b) The maximum forecast temperature during the week was 35\u00b0C.
\n(c) The minimum actual temperature during the week was 15\u00b0C.
\n(d) Difference between the actual temperature and forecast temperature.
\nMonday = 17.5\u00b0C – 15\u00b0C = 2.5\u00b0C
\nTuesday = 20\u00b0C – 20\u00b0C = 0\u00b0C
\nWednesday = 30.0\u00b0C – 25\u00b0C = 5\u00b0C
\nThursday = 22.5\u00b0C – 15\u00b0C = 7.5\u00b0C
\nFriday = 15\u00b0C – 15\u00b0C = 0\u00b0C
\nSaturday = 30\u00b0C – 25\u00b0C = 5\u00b0C
\nSunday = 35\u00b0C – 35\u00b0C = 0\u00b0C
\nThe maximum difference was on Thursday.<\/p>\n

Question 5.
\nUse the tables below to draw linear graphs.
\n(a) The number of days a hill side city received snow in different years.
\n\"NCERT<\/p>\n

(b) Population (in thousands) of men and women in a village in different years.
\n\"NCERT
\nAnswer:
\n(a) Linear graph show snow fall received in different years.
\n\"NCERT<\/p>\n

\"NCERT<\/p>\n

(b) Linear graph showing population of men and women in a village in different years:
\n\"NCERT<\/p>\n

Question 6.
\nA courier-person cycles from a town to neighbouring suburban area to deliver a parcel to a merchant. His distance from the town at different times is shown by the following graph.
\n(a) What is the scale taken for the time axis?
\n(b) How much time did the person take for the travel?
\n(c) How far is the place of the merchant from the town?
\n(d) Did the person stop on his way? Explain.
\n(e) During which period did he ride fastest?
\n\"NCERT
\nAnswer:
\n(a) The time is taken along the x-axis The scale along x-axis is 4 units = 1 hour
\n(b) Total travel time
\n= 8 a.m to 10 a.m and further 10.30 a.m to 12 noon
\n= 3\\(\\frac { 1 }{ 2 }\\) hours.
\n(c) Distance of the merchant from the town = 22km
\n(d) Yes, the stop age time = 10.00 am to 10.30am
\n(e) His fastest ride is between 8.00 am and 9.00 am<\/p>\n

Question 7.
\nCan there be a time-temperature graph as follows? Justify your answer.
\n\"NCERT
\n\"NCERT
\n\"NCERT
\nAnswer:
\n(i) It shows a time-temperature graph. It shows increase in temperature with increase in time.
\n(ii) It shows a time-temperature graph. It shows decrease in temperature with increase in time.
\n(iii) It cannot be time-temperature graph because it shows many-many different temperature uses at one particular time.
\n(iv) It shows a time-temperature graph. It shows a fixed temperature at difference times.<\/p>\n","protected":false},"excerpt":{"rendered":"

These NCERT Solutions for Class 8 Maths Chapter 15 Introduction to Graphs Ex 15.1 Questions and Answers are prepared by our highly skilled subject experts. NCERT Solutions for Class 8 Maths Chapter 15 Introduction to Graphs Exercise 15.1 Question 1. The following graph shows the temperature of a patient in a hospital recorded every hour. …<\/p>\n

NCERT Solutions for Class 8 Maths Chapter 15 Introduction to Graphs Ex 15.1<\/span> Read More »<\/a><\/p>\n","protected":false},"author":9,"featured_media":0,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"spay_email":""},"categories":[1],"tags":[],"yoast_head":"\nNCERT Solutions for Class 8 Maths Chapter 15 Introduction to Graphs Ex 15.1 - NCERT Solutions<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/ncertsolutions.guru\/ncert-solutions-for-class-8-maths-chapter-15-ex-15-1\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"NCERT Solutions for Class 8 Maths Chapter 15 Introduction to Graphs Ex 15.1 - NCERT Solutions\" \/>\n<meta property=\"og:description\" content=\"These NCERT Solutions for Class 8 Maths Chapter 15 Introduction to Graphs Ex 15.1 Questions and Answers are prepared by our highly skilled subject experts. 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