KV JETPUR MATHS QUIZ CLASS 8TH CHAPTER 1st

Say true or false

rational numbers are closed under the operation of addition

• True

• False

Say true or false

Rational numbers are not closed under operation of multiplication

• True

• False

Additive identity of rational numbers is ?

• 0

• 1

• -1

• 2

Multiplicative identity of rational numbers is ?

• 0

• 1

• -1

• 2

multiplicative identity of

 $-\frac{2}{3}$  is ?

• 1

• 0

•  $\frac{3}{2}$  

•  $\frac{2}{3}$  

Additive inverse of

 $\frac{5}{4}$  is ?

• 0

• 1

•  $-\frac{5}{4}$  

•  $-\frac{4}{5}$  

Multiplicative Inverse of -5 is

• 0

• 1

• 
  

  $\frac{1}{5}$
  

• $\frac{1}{-5}$

Reciprocal of 1 is

• 0

• 1

• -1

• 2

commutative property for addition is

• a + b = a + b

• a + b = c + d

• a + b = b + a

• a + b = a - b

Associative property of rational numbers is

• a x ( b x c ) = ( a x b ) x c

• a x ( b x c ) = a x ( c x b )

• a x ( b x c ) = ( b x c ) x a

• none of these