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Question 1 of 10
1. Question
A number for which sum of all its factors is equal to twice the given number is called _____
Correct
Well Done!
Incorrect
OOPS INCORRECT ANSWER!

Question 2 of 10
2. Question
28 is a
Correct
EXCELLENT!
Explanation: Factors of 28 are 1,2,4,7,14,28 .
Sum of all the factors of 28 are 1+2+4+7+14+28 = 56 = 2X28
Thus, 28 is a perfect number because the sum of the factors of 28 is equal to twice of 28.Incorrect
OOPS YOUR ANSWER IS WRONG
Correct Answer: both (a) and (b)
Explanation: Factors of 28 are 1,2,4,7,14,28 .
Sum of all the factors of 28 are 1+2+4+7+14+28 = 56 = 2X28
Thus, 28 is a perfect number because the sum of the factors of 28 is equal to twice of 28. 
Question 3 of 10
3. Question
The number of natural numbers from m to n where m > n is
Correct
Good!
Incorrect
OOPS YOUR ANSWER IS WRONG
Correct Answer: m – n + 1 
Question 4 of 10
4. Question
If (2^{n}1) is a prime number , then 2^{n1}(2^{n} 1) is a
Correct
Superb!
Incorrect
OOPS YOUR ANSWER IS WRONG
Correct Answer: Perfect Number 
Question 5 of 10
5. Question
The number of natural numbers between two numbers is m and n where m > n is
Correct
PERFECT!
Incorrect
OOPS YOUR ANSWER IS WRONG
Correct Answer: mn1 
Question 6 of 10
6. Question
Zero is
Correct
Very Good!
Incorrect
OOPS YOUR ANSWER IS WRONG
Correct Answer: Neither a positive nor a negative integer

Question 7 of 10
7. Question
Positive integers are denoted by
Correct
Well Done!
Incorrect
OOPS YOUR ANSWER IS WRONG
Correct Answer: Z^{+}

Question 8 of 10
8. Question
The set of non negative integers are denoted by
Correct
Perfect!
Explanation:
Non negative integer set is equivalent to whole number set.Incorrect
OOPS YOUR ANSWER IS WRONG
Correct Answer: W
Non negative integer set is equivalent to whole number set. 
Question 9 of 10
9. Question
Additive inverse of x is
Correct
Well Done!
Incorrect
OOPS YOUR ANSWER IS WRONG
Correct Answer: x 
Question 10 of 10
10. Question
Repeated addition is called ________
Correct
Well Done!
Incorrect
OOPS YOUR ANSWER IS WRONG
Correct Answer: Multiplication