EXERCISE: MARK AGAINST THE CORRECT ANSWER IN EACH OF THE FOLLOWING IN 71 TO 80:

         71. The sum of first five prime numbers is:

a)      0

b)      1

c)       2

d)      3

72.   The sum of first five prime numbers is:

a)      16

b)      15

c)       14

d)      18

73.   Which of the following is a prime number?

a)      33

b)      81

c)       93

d)      97

74.   Which one of the following is not a prime number?

a)      31

b)      61

c)       71

d)      91

75.   Which one of the following is a prime number?

a)      161

b)      221

c)       373

d)      437

e)      None of these

76.   Which one of the following is a prime number?

a)      119

b)      187

c)       247

d)      551

e)      None of these

77.   The smallest 3-digit prime number is:

a)      103

b)      107

c)       109

d)      113

e)      None of these.

78.   If a and b are odd numbers, then which of the following is even?

a)      A + b

b)      A+ b +1

c)       ab

d)      ab+2

79.   Which one of the following cannot be the square of a natural number?

a)      30976

b)      75625

c)       28561

d)      143642

80.   Which one of the following cannot be the square of a natural number?

a)      32761

b)      81225

c)       42437

d)      20164

 ANSWERS:

                                    71.(D)

                                    72.(B)

                                    73.(D) 

                                   74.(D)

                                   75.(C)

                                   76.(E) 

                                   77.(E) 

                                   78.(A) 

                                  79.(D)

                                   80.(C)