Test: Cubes And Cube Roots- 1


10 Questions MCQ Test UPSC Prelims Paper 2 CSAT - Quant, Verbal & Decision Making | Test: Cubes And Cube Roots- 1


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QUESTION: 1

Find the cube root of 75.

Solution:

QUESTION: 2

What is the cube of double of ‘a’?

Solution:

Double of a here a+a=2a

So cube of (2a)³=8a³

QUESTION: 3

Which of the following is the cube root of 27000?

Solution:

QUESTION: 4

A natural number is said to be a perfect cube, if it is the cube of some ________.

Solution:

Its natural number as a cube of a natural number is a perfect cube.For example , 8 is the perfect cube of 2 which is a natural number but 13 is not a perfect cube as it is not a cube of any natural number.

QUESTION: 5

36x is a perfect cube number, then x = ______

Solution:

6×6=36 and 36×6=216, which is the cube of 6.

QUESTION: 6

Express 6as the sum of odd numbers.

Solution:

The answer is b because 31 + 33 + 35 + 37 + 39 + 41 = 216 and the cube of 6 is also 216,  6×6×6=216

QUESTION: 7

Ones digit of cube of a number depends on the ________ of the number.

Solution:

For example, 11*11*11=121*11,where one’s digit depends on 1, 121*11=1331 where again one’s digit depends on 1.Hence one’s digit of a perfect cube of a number depends on one’s digit.

QUESTION: 8

The numbers 1, 8, 27... are ____________.

Solution:

1×1×1 =1  

2×2×2 = 8

3×3×3 = 27

4×4×4 = 64

5×5×5 = 125

QUESTION: 9

Ones place digit in the cube of 5832 is ______.

Solution:

5832  
One's digit of 5832= 2
cube of 2=23 = 8 
So, the one's digit of cube of 5832=8

QUESTION: 10

Find the prime factorisation of 175616.

Solution:

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