Number System MCQs

Question 1

What is the sum of first 20 terms of the following series? 1 × 2 + 2 × 3 + 3 × 4 + 4 × 5 + . . . . . . . .

Accepted Answer

3080

Answer

3160

Answer

3240

Answer

2940

Question 2

How many numbers are there from 400 to 700 in which the digit 6 occurs exactly twice?

Accepted Answer

20

Answer

19

Answer

18

Answer

21

Question 3

Which one of the following is the minimum value of the sum of two integers whose products is 24?

Accepted Answer

10

Answer

25

Answer

11

Answer

8

Question 4

A four-digit pin, say 'abcd', of a lock has different non-zero digits. The digits satisfy b = 2a, c = 2b, d = 2c. The pin is divisible by . . . . . . . .

Accepted Answer

2, 3, 13

Answer

2, 3, 5

Answer

2, 3, 7

Answer

2, 3, 11

Question 5

The real number to be added to 13851 to get a number which is divisible by 87 is:

Accepted Answer

69

Answer

18

Answer

43

Answer

54

Question 6

Weight of a bucket when filled fully with water is 17 kg. If the weight of the bucket when half filled with water is 13.5 kg, what is the weight of empty bucket?

Accepted Answer

10 kg

Answer

12 kg

Answer

8 kg

Answer

7 kg

Question 7

5349 is added to 3957. Then 7062 is subtracted from the sum. The result is not divisible by

Accepted Answer

7

Answer

4

Answer

3

Answer

11

Question 8

If each of the two numbers 516 and 525 are divided by 6, the remainders are R1 and R2 respectively. What is the value of $$\frac{{{{	ext{R}}_1} + {{	ext{R}}_2}}}{{{{	ext{R}}_2}}}?$$

Accepted Answer

$$\frac{6}{5}$$

Answer

$$\frac{1}{6}$$

Answer

$$\frac{5}{6}$$

Answer

$$\frac{1}{5}$$

Question 9

Let x = 224 and y = 322. If the highest common factor of 23x and a × y is divisible by x and y, then what can be the possible value of a?

Accepted Answer

16

Answer

4

Answer

12

Answer

8