Rational Numbers — Maths STD 8 — Question

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

Study the above graph carefully and answer the questions given below:

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?

Identify all the quadrilaterals that have:
Four sides of equal length.

Draw ∆XYZ and ∆DEF such that, l(XZ) = l(DF), ∠X ≅ ∠D and ∠Z ≅ ∠F.
Copy ∆XYZ on a tracing paper and place it over ∆DEF. What do you notice ?

Write ‘T’ for true and ‘F’ for false for the following:
Rational numbers are always closed under subtraction.

Using square root table, find the square root:
15

Which of the following quantities vary inversely as other?
The number of x men hired to construct a wall and the time y taken to finish the job.

Fill in the blanks in the following so as to make the statement true:
If u = 3 v, then u and v vary _________ with each other.

Fill in the blank:
The reciprocal of a, where a ≠ 0, is _________.