Square Root and Cube Root

Square Root and Cube Root

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Question 1
The cube root of .000216 is:
A
.6
B
.06
C
77
D
87
Question 1 Explanation: 
.06*.06*.06=.000216
Question 2
The least perfect square, which is divisible by each of 21, 36 and 66 is:
A
213444
B
214344
C
214434
D
231444
Question 2 Explanation: 
L.C.M. of 21, 36, 66 = 2772. Now, 2772 = 2 x 2 x 3 x 3 x 7 x 11 To make it a perfect square, it must be multiplied by 7 x 11. So, required number = 2^2 x 3^2 x 7^2 x 11^2 = 213444
Question 3
A group of students decided to collect as many paise from each member of group as is the number of members. If the total collection amounts to Rs. 59.29, the number of the member is the group is: A. B. C. D. Answer: Option C Explanation:
A
57
B
77
C
87
D
67
Question 3 Explanation: 
Money collected = (59.29 x 100) paise = 5929 paise. Number of members = squareroot(5929) = 77.
Question 4
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
Question 4 Explanation: 
A number ending in 8 can never be a perfect square.
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