number system Model Questions & Answers, Practice Test for ssc steno grade c d 2024
ssc steno grade c d 2024 SYLLABUS WISE SUBJECTS MCQs
Number System
Simplification
Power, Indices And Surds
Ratio & Proportion
Percentage
Time & Work
Time & Distance
An army Commander wishing to draw up his 5180 men in the form of a solid square found that he had 4 men less. If he could get four more men and form the solid square, the number of men in the front row is
Answer: (c)
An army commander has 5180 men in the form of a solid square.
If he get four more men and form the solid square then no. of men in the front row
$√{5180 + 4} = √5184 = 72$
The sum of twice of a number and thrice of 42 is 238. What will be the sum of thrice of that number and twice of 42 ?
Answer: (d)
According to question number = x
x × 2 + 42 × 3 = 238
2x = 112 or x = 56
Again 3 × 56 + 42 × 2 = 168 + 84 = 252.
The difference between the squares of two consecutive odd integers is always divisible by
Answer: (b)
Let two consecutive odd numbers = (2x + 1) and (2x + 3)
According to question
= $(2x + 3)^2 – (2x + 1)^2$
= $4x^2 + 12x + 9 – 4x^2 – 1 – 4x$
= 8x + 8 = 8(x + 1)
So, it is divisible by 8.
If k is a positive integer, then every square integer is of the form
Answer: (d)
For square integer 25, 4k + 1 mean 4 × 6 + 1 and for 36
4k mean 4 × 9
Now, if k is a positive integer, then every square integer is of the form 4k or 4k + 1
If $1^3 + 2^3 + ....... + 9^3$ = 2025, then the approx. value of $(0.11)^3 + (0.22)^3 + ....... + (0.99)^3$ is
Answer: (a)
$(0.11)^3 + (0.22)^3 + ..... + (0.99)^3$
= $(0.11)^3 [1^3 +2^3 + ....... 9^3]$
= $(0.11)^3$ × 2025 = 2.695
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