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1
A pair of prime numbers whose difference is 2 are called ____________________.
Prime Numbers
Co-Prime Numbers
Twin Prime Numbers
All of these
2
Which of the following pairs of number are co-primes?
11, 111
22, 222
12, 36
14, 50
3
The difference between a 2- digit number and the number obtained by reversing the digit is 27.The difference between the two digit of that number is _____________
5
4
Example for co-prime mumbers is:
25, 14
18, 16
9, 18
11, 77
The difference between a 2- digit number and the number obtained by reversing the digit is 18.The difference between the two digit of that number is _____________
6
How many prime numbers are these between 10 and 20?
7
23 and 24 are co-prime numbers or not?
True
False
Not sure
None of these
8
An example for twin primes is:
5, 11
3, 5
11, 17
3, 7
9
The smallest odd composite number is ___________
10
Which of the following is/ are a twin primes pairs:
(11,13) and (17,19)
(71, 73) and (59, 61)
(29, 31) and (41, 43)
11
The sum of the digit of a 2-digit number is 8. If the number obtained by interchanging the digits is 36 more than the original number. Find the number?
26
25
85
56
12
Least prime number is ___________________.
0
13
Which of the following statement is false?
(i) An even number is always divisible by 3.
(ii) Even numbers leaves remainder 0 when divided by 2.
(iii) Product of two even numbers is always even.
(i), (ii)
(ii),(iii)
(i)
(iii)
14
From the first five multiples of 5, which are even numbers?
20
10,20
10,15
15
The largest 4-digit even number and smallest 4-digit odd number are respectively ____________________
1000 and 9999
9998 and 1001
1001 and 9998
9999 and 1000
16
Find the product of the values of the literal (a) in 325, (b) in 526 and (c) in 987 when the general form is .
32
42
17
If p is the prime number that (p+2) is also a prime number , then p(p+2)+1 is always ___________________
A prime number
An odd integer
Not a perfect square
A perfect square
18
Which is the smallest and largest odd prime number in between 24 and 60 ?
27,57
29,57
29,59
27,59
19
The sum of the digit of a 2-digit number is 6. If the number obtained by interchanging the digits is 18 more than the original number. Find the sum of the number and the number obtained after interchange ?
66
24
Consider the following statements.Which of the above statement (s) is /are correct?
(i) Every prime is odd.
(ii) Product of any two prime numbers is odd.
Only (i)
Only (ii)
Both (i) and (ii)
Neither (i) nor (ii)