CBSE Class 8 Mathematics Cubes and Cube Roots MCQs Set A

Question: The value of 3√343 X 3√−64 is 

• a) –28
• b) –18
• c) 28
• d) 18

Answer: –28

Question: The length of each side of the cubical box is 2.4 m. Its volume is

• a) 13.824 cu m
• b) 13.824 cu cm
• c) 13.824 cm²
• d) None of these

Answer: 13.824 cu m

Question: The cube of a number is 8 times the cube of another number. If the sum of the cubes of numbers is 243, the difference of the numbers is

• a) 3
• b) 6
• c) 4
• d) none

Answer: 3

Question: The square of a natural number subtracted from its cube is 48. The number is

• a) 4
• b) 6
• c) 5
• d) 8

Answer: 4

Question: Which of the following numbers are perfect cubes?

• a) 343
• b) 5324
• c) 108
• d) 243

Answer: 343

Question: Which of the following are the cubes of even natural numbers?

• a) 13824
• b) 3375
• c) 729
• d) 1331

Answer: 13824

Question: Which of the following are the cubes of odd natural numbers?

• a) 6859
• b) 32768
• c) 4096
• d) 1728

Answer: 6859

Question: The cube root of 0.001728 is

• a) 0.12
• b) 12
• c) 1.2
• d) none

Answer: 0.12

Question: Choose the correct statement

• a) All the above
• b) Cubes of even natural numbers are even
• c) Cubes of negative integers are negative
• d) Cubes of odd natural numbers are odd

Answer: All the above

Question: If 72K is a perfect cube, then the value of K is

• a) 3
• b) 1
• c) 2
• d) 4

Answer: 3

Question:

The cube root of 27² is

• a) 9
• b) 27
• c) 3
• d) none

Answer: 9

Question: The cube of 0.9 is

• a) 0.729
• b) none
• c) 72.9
• d) 7.29

Answer: 0.729

Question: The number which is not a perfect cube among the following is

• a) 243
• b) 1331
• c) 216
• d) 512

Answer: 243

Question: The smallest number by which 2560 must be multiplied so that the product is a perfect cube is

• a) 25
• b) 15
• c) 5
• d) 10

Answer: 25

Question: The smallest number by which 8788 must be divided so that the quotient is a perfect cube is

• a) 4
• b) 16
• c) 12
• d) 32

Answer: 4

Question: The cube root of 1.331 is

• a) 1.1
• b) 0.011
• c) 0.11
• d) 11

Answer: 1.1

Question: Two cubes have volume in the ratio 1 : 27. The ratio of the area of the face of one to that of the other is

• a) 1 : 9
• b) 1 : 3
• c) 1 : 6
• d) 1 : 18

Answer: 1 : 9

Question: By what least number must 21600 be multiplied to make it a perfect cube?

• a) 10
• b) 60
• c) 6
• d) 30

Answer: 10

Question: The smallest number by which 392 must be multiplied so that the product is a perfect cube is

• a) 7
• b) 3
• c) 9
• d) 5

Answer: 7

Question: How many small cubes with edges of 10 cm can be just accommodated in a cubical box of 1 m edge?

• a) 1000
• b) 10
• c) 100
• d) 10000

Answer: 1000