Question

EXERCISE 1.1
Bengaluru
1. Following number line shows the temperature in degree celsius (°C) at different places
(a) Observe this number line and write the temperature of the places marked on il
(b) What is the temperature difference between the hottest and the coldest places
(d) Can we say temperature of Srinagar and Shimla taken together is less than the
on a particular day.
Lahulspitis Srinagars
Shimla
Ooty
20
25
-10 -5 - 0
5
among the above?
(c) What is the temperature difference between Lahulspiti and Srinagar?
10
15
temperature at Shimla? Is it also less than the temperature at Srinagar?
2. In a quiz, positive marks are given for correct answers and negative marks are given
for incorrect answers. If Jack's scores in five successive rounds were 25, -5, -10,
15 and 10, what was his total at the end?

Answer 1

NCERT Solutions for Class 7 Maths Chapter 1: Integers

Exercise 1.1 (Page number 4)

Question1. Following number line shows the temperature in degree celsius (°C) at different places on a particular day.

Jagranjosh

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

Solution (a):

Place

Temperature

Bangalore

22o C

Ooty

14o C

Shimla

5o C

Srinagar

‒2o C

Lahulspiti

‒8o C

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

Solution (b):

The hottest place is Bangalore with temperature 22o C

The coldest place is Lahulspiti with temperature ‒ 8o C

Temperature difference = (22o C) ‒ (‒ 8o C) = 30o C.

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

Solution (c):

Lahulspiti’s temperature = ‒ 8o C

Srinagar’s temperature = ‒2o C

Temperature difference = (‒2o C) ‒ (‒ 8o C) = 6o C.

(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 (d):

Srinagar’s temperature = ‒ 2o C, Shimla’s temperature = 5o C

Temperature of Shimla and Srinagar when taken together = (5o C) + (‒ 2o C) = 3o C

Since, Srinagar’s temperature = ‒2o C

Clearly, Srinagar’s temperature is greater.

ques2-Question2. In a quiz, positive marks are given for correct Solutions and negative marks are given for incorrect Solutions. If Jack’s scores in five successive rounds were 25, – 5, – 10, 15 and 10, what was his total at the end?

Solution2:

Jack’s total will be the sum of score of all the rounds i.e., (25) + (− 5) + (− 10) + (15) + 10 = 35.

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