Square and Square roots

Which of the following is a perfect square?
625
7928
1057
64000
What will be the number of zeros in square of 400?
1
4
7
2
Which of the following will have 6 at unit place?
19
11
24
13
Find the greatest four-digit number that is a perfect square.
9990
9801
9999
None
49 can be expressed as the sum of how many same odd numbers?
5
9
7
11
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