# 1000+ Quantitative Aptitude Topic Wise Questions and Answers Pdf - 1

Question: 1

A prime number N, in the range 10 to 50 remains unchanged when its digits are reversed. The square of such a number is

(A) 1936

(B) 1089

(C) 484

(D) 121

Ans: D

Clearly, 11 is a prime number which remains unchanged when its digit are interchanged. And, (11)2 = 121.

Hence, the square of such a number is 121.

Question: 2

The number 89715983* is divisible by 4. The unknown non zero digit marked as * will be

(A) 2

(B) 3

(C) 4

(D) 6

Ans: C

Let the missing digit be x. Then, (80 + x) must be divisible by 4. Hence x = 4.

Question: 3

How many 3 digit numbers are those in between 100 and 300, having first and the last digit as 2?

(A) 9

(B) 10

(C) 11

(D) 12

Ans: B

Such numbers are 202, 212, 222, 232, 242, 252, 262, 272, 282, 292. There are 10 such numbers.

Question: 4

Which of the following is always odd?

(A) Sum of two odd numbers

(B) Product of two odd numbers

(C) Difference of two odd numbers

(D) None of these

Ans: B

Product of two odd numbers

Question: 5

Consider the following statements about natural numbers
(1) There exists a smaller natural number.
(2) There exists a largest natural number.
(3) Between two natural numbers, there is always a natural number.
Which of the above statement is/are correct?

(A) None

(B) Only 1

(C) 1 and 2

(D) 2 and 3

Ans: B

Clearly, there exists a smallest natural number, namely 1. So that statement (1) is true.

Natural numbers are counting numbers and the counting process never ends. So, the largest number is not known. Thus, statement (2) is false.

There is no natural number between two consecutive natural numbers. So, statement (3) is false.

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