Q70 of 90 Page 372

A man started his journey on his journey on his car from location A and came back. The given graph shows his position at different times during the whole journey.


A) At what time did he start and end his journey?


B) What was the total duration of journey?


C) Which journey, forward or return, was of longer duration?


D) For how many hours did he not move?


E) At what time did he have the fastest speed?

A) From the graph , we can say that, the man started his journey at 5:30 am and ended at 6pm.


B) From the graph , we can say that, the total duration of journey is hours ie. From 5:30 am to 6pm.


C) From the graph , we can say that, the forward journey was of hours and the return journey was of 4 hours.


∴ The forward journey was of longer duration.


D) From the graph , we can say that, the man did not move for 6 hours(he did not move from 6:30 am to 9:30 am and 10am to 1pm).


E) From the graph , we can say that, the man had the fastest speed from 1pm to 2pm because in that interval he covered 60kms in just 1 hour.


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68

The following graph shows the change in temperature of a block of ice when heated. Use the graph to answer the following questions:


A) For how many seconds did the ice block have no change in temperature?


B) For how long was there a change in temperature?


C) After how many seconds of heating did the temperature become constant at 100°C?


D) What was the temperature after 25 seconds?


E) What will be the temperature after 1.5 minutes? Justify your answer.

 69

The following graph shows the number of people present at a certain shop at different times. Observe the graph and answer the following questions.


A) What type of a graph is this?


B) What information does the graph give?


C) What is the busiest time of day at the shop?


D) How many people enter the shop when it opens?


E) About how many people are there in the shop at 1:30 pm?

 71

The following graph shows the journey made by two cyclists, one from town A to B and the other from town B to A.


A) At what time did cyclist II rest? How long did the cyclist rest?


B) Was cyclist II cycling faster or slower after the rest?


C) At what time did the two cyclists meet?


D) How far had cyclist II travelled when he met cyclist I?


E) When cyclist II reached town A, how far was cyclist I from town B?

 72

Ajita starts off from home at 07.00 hours with her father on a scooter that goes at a uniform speed of 30km/h and drops her at her school after half an hour. She stays in the school till 13 30hours and takes an auto rickshaw to return home. The rickshaw has a uniform speed of 10km/h. Draw the graph for the above situation and also determine the distance of Ajita’s school from her house.