(1) closure law

(2) commutative law

(3) associative law

(4) None of the above

2. The interior angles of a polygon are in A.P. If the smallest angle be 120° and angles differ by 5°, then number of sides in polygon is

(1) 6

(2) 7

(3) 8

(4) 9

3. If a, b, c are rational numbers, thendistributive law for multiplication overaddition is

(1) a × (b + c) = (a × b) + c

(2) a + (b × c) = (a + b) × (a + c)

(3) a × (b + c) = (a × b) + (a × c)

(4) a + (b × c) = (a + b) × c

4.Additive identity of real numbers is

(1) 1

(2) 0

(3) –1

(4) None of these

3/16 (3) 5 (4) –1

For full paper click http://cbseadda.blogspot.com/