Rational Nos 7 & 8

Question 1

Square of 17

Answer 1

289

Question 2

Square of 18

Answer 2

324

Question 3

Square of 19

Answer 3

361

Question 4

Square of 23

Answer 4

529

Question 5

Square of 24

Answer 5

576

Question 6

Square of 27

Answer 6

729

Question 7

Square of 28

Answer 7

784

Question 8

Total prime nos btw 1 and 100

Answer 8

25

Question 9

Total no of composite no btw 1 and 100

Answer 9

74

Question 10

abc + bca + cab is divisible by

Answer 10

111

Question 11

abc - cba is divisible by

Answer 11

99

Question 12

The set of integers is represented by

Answer 12

I or Z

Question 13

The recurring part of a ‘non terminating recurring decimal’ -

Answer 13

Period

Question 14

The number of digits in the recurring part of the decimal

Answer 14

Periodicity

Question 15

A fraction p/q is terminating if prime factors of q are

Answer 15

2 or 5

Question 16

∈

Answer 16

a ∈ S means a is an element of the set S; a ∉ S means a is not an element of S.

Question 17

The four fundamental operations of maths are called

Answer 17

Binary operations

Question 18

If a group of numbers satisfy the commutative property it is called an

Answer 18

Abelian group

Question 19

Square root of 2

Answer 19

1.414

Question 20

Irrational numbers represented by

Answer 20

Q

Question 21

Prime numbers differing by 2

Answer 21

Twin primes

Question 22

Prime triplet

Answer 22

Set of three consecutive prime numbers

Question 23

LCM X HCF =

Answer 23

Product of two numbers

Question 24

LCM of fractions =

Answer 24

LCM of numerators / HCF of denominators

Question 25

HCF of fractions

Answer 25

HCF of numerators / LCM of denominators

Question 26

Pythagoreans ?

Answer 26

Followers of the great philosopher and mathematician Pythagoras.

Question 27

All the points on a number line are

Answer 27

Real numbers

Question 28

Difference,quotients and products of irrational numbers are

Answer 28

Not always irrational

Question 29

This sign √ is also called as the

Answer 29

Radical sign

Question 30

The word geography comes from the word

Answer 30

(Greek) - Geo- Earth Metrein - measure

Question 31

Sulbasutras

Answer 31

sutra texts belonging to the Śrauta ritual and containing geometry related to fire-altar construction. (In ancient India)

Question 32

Who gave the first proof and what was it

Answer 32

Thales. The proof was of the statement that a circle is bisected by its diameter.

Question 33

Pythagoras was a pupil of

Answer 33

Thales

Question 34

Father of geometry

Answer 34

Euclid

Question 35

What did Euclid do

Answer 35

He collected all the mathematical work till the 300 BC and arranged it in his famous treatise called ‘elements’. He divided it into 13 chapters. Each chapters were called a book. The books influenced the geometry known to the world.

Question 36

Systems of axioms are called

Answer 36

Consistent

Question 37

Propositions or theorems : ?

Answer 37

Statements that are proved, using definition, axioms, previously proved statements, and deductive thinking.

Question 38

Euclid deduced around ........ theorems.

Answer 38

465

Question 39

Playfair axiom

Answer 39

For every line l and for every point P not lying on l , there is a unique passing through P and parallel to l.