square root and cube root aptitude questions

11.

	625	x	14	x	11		is equal to:
	11		25		196

A.	5	B.	6
C.	8	D.	11

Answer: Option A

Explanation:

Given Expression =	25	x	14	x	11	= 5.
	11		5		14

12.

0.0169 x ? = 1.3

A.	10	B.	100
C.	1000	D.	None of these

Answer: Option B

Explanation:

Let 0.0169 x x = 1.3.

Then, 0.0169x = (1.3)² = 1.69

x =	1.69	= 100
	0.0169

13.

	3 –	1		2	simplifies to:
		3

None of these

Answer: Option C

Explanation:

	3 –	1		2	= (3)² +		1		2	– 2 x 3 x	1
		3					3				3

= 3 +	1	– 2
	3

= 1 +	1
	3

=	4
	3

14.

How many two-digit numbers satisfy this property.: The last digit (unit’s digit) of the square of the two-digit number is 8 ?

A.	1	B.	2
C.	3	D.	None of these

Answer: Option D

Explanation:

A number ending in 8 can never be a perfect square.

15.

The square root of 64009 is:

A.	253	B.	347
C.	363	D.	803

Answer: Option A

Explanation:

   2|64009( 253
    |4
    |----------
  45|240
    |225
    |----------
 503|  1509
    |  1509
    |----------
    |     X
    |----------

64009 = 253.