Question

Q) the smallest three-digit cube number is:
a)100 b)121 c)125 d)216
Q) the cube root of 729 is :
a)7 b)8 c)9 d)none
Q) unit digit in the cube of 438976 is:
a)2 b)3 c)6 d)8
Q) by which smallest number 900 must be multiplied so that it is a perfect cube:
a)10 b)20 c)30 d)100

Answer 1

1) ----> c) 125 (cube of 5)

2) ----> c) 9

3) ----> c) 6

4) ----> d) 100 (900×100 = 90000)

and we know that √90000 is 300

hope it helps.......

Answer 2

Answer:

(1Q) 125 = ( 5 * 5 * 5) So, compared to all options this is the smallest.

          -->option (c)

(2Q) cube root of 729 is : (729)=(( 9 )^3 )^1/3=9.

        -->option (c)

(3Q)  --->option(c)

(4Q)   --->option(d)