1000+ Aptitude Questions and Answers for Freshers - 12

 Question: 6

If m and n are integers, divisible by 5, which one of the following is not necessary true?

(A) m – n is divisible by 5

(B) m + n is divisible by 10

(C) m2 - n2 is divisible by 25

(D) none of these

View Answer

Ans: B

Take m = 15 and n = 20. Then, each one of m and n is divisible by 5. But (m + n) is not divisible by 10.

Hence, (m + n) is divisible by 10 is not true.

Question: 7

The largest number that exactly divides each number of the sequence 15 - 1, 25 - 2, 35 - 3, …..,n5 - n, …. Is

(A) 1

(B) 15

(C) 30

(D) 120

View Answer

Ans: C

Required number = (25 - 2) = (32 – 2) = 30.

Question: 8

The total numbers of integers between 200 and 400, each of which either begins with 3 or ends with 3 or both is

(A) 10

(B) 80

(C) 100

(D) 110

View Answer

Ans: D

Such numbers are 203, 213, 233, 243, 253, 263, 273, 283, 293 and all numbers from 300 to 399. Clearly, number of such numbers = 10 + 100 = 110.

Question: 9

1260 ÷ 14 ÷ 9 = ?

(A) 8

(B) 9

(C) 10

(D) 81

View Answer

Ans: C

1260 ÷ 14 ÷ 9 = (1260×

1

14

×

1

9

) = 10.

Question: 10

The smallest number that must be added to 803642 in order to obtain a multiple of 11 is

(A) 1

(B) 4

(C) 5

(D) 7

View Answer

Ans: D

On dividing 803642 by 11, we get 4 as remainder.

Required number to be added = (11 – 4) = 7.