Question of Exercise-2

# Question 5 raised to the second power = _____

If p when a positive integer and a negative integer are

added we always get a negative integer and q: when two negative integers are added, we get a positive integer, then.

A: Both p and q are true

B: p is true and q is false

C: p is false and q is true

D: Both p and q are false

Solution:

Explanation:

Let, two integers 8 (Positive integer) and -2(negative integer)

Sum of 8 and -2 is 6 (positive integer)

Which implies that, It is not necessary “when a positive integer and a negative integer are added we always get a negative integer ” It can be positive also.

P statement is false

Let two negative integers be -2 and -3

The sum of -2 and -3 is -5 which is negative.

q statement is false.

Option (D) is correct. As, both the statements are false.

Find the circumference of a circle whose radius is equal to 15cm

Use =3.14 .

Solution:

Explanation:

Given,

The radius of a circle r = 15cm

Circumference of a circle = 2r

=2×3.14×15

= 94.2cm

Hence, the circumference of a circle whose radius is equal to 15cm is 94.2cm.

Factorize a-b-a^2+b^2

Solution:

Explanation:-

Given polynomial is

The correct option is (A).

Write true (T) or false (F) for the following statements

No cube can end with exactly two zeros.

A: True

B: False

Solution:

Explanation:-

Statement is True

Because a perfect cube always have zeros in multiple of 3.

For example:-

(10)3=1000.

Hence option (A) is correct.True

Which of the following is false

Solution:

Explanation:-