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Class 8 Maths Study Material

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Cubes and cube roots

Cube root of negative number can be:

a) Can be positive or negative
b) Can only be positive
c) Can only be negative
d) Depend upon values

✔Answer

Correct Answer Is : Can only be negative

Solution Is :

A natural number is said to be perfect cube if:

a) If it a cube of any rational number
b) If it a cube root of some natural number
c) If it a cube of some natural number
d) Both B and C

✔Answer

Correct Answer Is : If it a cube of some natural number

Solution Is :

Cube of "3" can be written as:

a) 3 * 3
b) 3 *3* 3
c) 3*10³
d) 3*3³

✔Answer

Correct Answer Is : 3 3 3

Solution Is :

Which is not the perfect cube in following numbers:

a) 64
b) 27
c) 144
d) 125

✔Answer

Correct Answer Is : 144

Solution Is :

To find whether the cube is perfect cube or not the prime factors should be grouped as:

a) each prime factor should appear twice
b) each prime factor should appear thrice
c) Prime factors grouped as per ascending order
d) Prime factors grouped as per descending order

✔Answer

Correct Answer Is : each prime factor should appear thrice

Solution Is :

Which is the perfect cube among following:

a) 2700
b) 3700
c) 2300
d) 1900

✔Answer

Correct Answer Is : 2700

Solution Is :

The volume of cube whose surface area is 150

a) 150
b) 1250
c) 125
d) 115

✔Answer

Correct Answer Is : 125

Solution Is :

For using column method the values of a and b can be written for the value of 56

a) A=6,b=5
b) A=5 , b=6
c) A=5 ,b= 5
d) A=6, b=6

✔Answer

Correct Answer Is : A=5 , b=6

Solution Is :

By using column method the cube of 99 is

a) 970299
b) 941192
c) 970300
d) 79300

✔Answer

Correct Answer Is : 970299

Solution Is :

When we use column method the value of column 3 for finding cubeof 24 is

a) 13
b) 58
c) 102
d) 64

✔Answer

Correct Answer Is : 58

Solution Is :

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Class 8 Maths Study Material

Cubes and cube roots

Cube root of negative number can be:

Correct Answer Is : Can only be negative

Solution Is :

A natural number is said to be perfect cube if:

Correct Answer Is : If it a cube of some natural number

Solution Is :

Cube of "3" can be written as:

Correct Answer Is : 3 *3* 3

Solution Is :

Which is not the perfect cube in following numbers:

Correct Answer Is : 144

Solution Is :

To find whether the cube is perfect cube or not the prime factors should be grouped as:

Correct Answer Is : each prime factor should appear thrice

Solution Is :

Which is the perfect cube among following:

Correct Answer Is : 2700

Solution Is :

The volume of cube whose surface area is 150

Correct Answer Is : 125

Solution Is :

For using column method the values of a and b can be written for the value of 56

Correct Answer Is : A=5 , b=6

Solution Is :

By using column method the cube of 99 is

Correct Answer Is : 970299

Solution Is :

When we use column method the value of column 3 for finding cubeof 24 is

Correct Answer Is : 58

Solution Is :

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Correct Answer Is : 3 3 3