Ncert solutions

# Question 1

Q1) Following number line shows the temperature in degree celsius (°C) at different places on a particular day.

(a) Observe this number line and write the temperature of the places marked on it.

(b) What is the temperature difference between the hottest and the coldest places among the above?

(c) What is the temperature difference between Lahulspiti and Srinagar?

(d) Can we say temperature of Srinagar and Shimla taken together is less than the temperature at Shimla? Is it also less than the temperature at Srinagar?

Solution (a):

Bengaluru - 22\degree C

Ooty - 14\degree C

Shimla - 5\degree C

Srinagar - -2\degree C

Lahulspiti - -8\degree C

Solution (b):

Hottest place = Bengaluru ( 22\degree C )

Coldest place = Lahulspitu ( -8\degree C )

So, difference between hottest and coldest part = 22\degree C-\left(-8\degree C\right)

= 22\degree C+8\degree C\ \ =\ 30\degree C

Solution (c):

Lahulspiti = -8\degree C

Srinagar = -2\degree C

Temperature between Lahulspiti and Srinagar = -8\degree C\ -\left(-2\degree C\right)

=-8\degree C+2\degree C

=-5\degree C

Solution (d):

Temperature of Srinagar = -2\degree C

Temperature of shimla = 5\degree C

According to the condition = 5\degree C+\left(-2\degree C\right)\

=5\degree C-2\degree C\ \ =3\degree C

therefore = 3\degree C<5\degree C

Thus, temperature of Srinagar and Shimla taken together is less than the temperature at Shimla.

Now, temperature of srinagar = -2\degree C

therefore, 3\degree C>-2\degree C

No, it is not less than the temperature at Srinagar.

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