squareroots and cuberoots Model Questions & Answers, Practice Test for ssc cgl tier 1 2023

Question :1

$^3$$√{6859}$ = ? - 4

Answer: (c)

? = $(6859)^{1/3}$ + 4 = 19 + 4 = 2 3

Question :2

The smallest number which when multiplied with 7200 will make the product a perfect cube, is

Answer: (c)

Expressing 7200 as its prime factors

7200 = 2 × 2 × 2 × 2 × 2 × 3 × 3 × 5 × 5

7200 = (2 × 2 × 2) × (2 × 2) × (3 × 3) × (5 × 5)

We find that prime factors 2, 3 & 5 appear in groups of two,

so to make the given no. perfect cube, we must multiply it

with 2 × 3 × 5 = 30

Question :3

$√10201 - √3136$ = ?

Answer: (b)

Question :4

A gardener arranges plants in rows to form a square. He finds that in doing so 15 plants are left out. If the total number of plants are 3984, the number of plants in each row are,

Answer: (a)

Gardener arranges (3984 – 15) = 3969 plants in different rows to form a square.

Let no. of plants in each row be 'x'

∴ x × x=3969

$x^2$=3969⇒x=63

Question :5

$(√5 -1)^2$ = ? - 2 $√5$

Answer: (b)

∴ ? -2$√5 = (√5-1)^2 = 5 + 1 - 2√5$

∴ ? = 6

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