10. The smallest number by which 50 should be divided so as to get a perfect square's
a) 2
b) 3
c) 5
d) 10
11.
Which of the following is perfect cube?
a) 2
b) 2
c) 4
d) 8
12. By the number should 81 be divided to get a perfect cube?
a) 3
b) 6
c) 7
d) 9
13.
Cube root of 1000 is
a) 10
b) 100
c) 20
d) 200
14. If 12k is a perfect cube, fidnd the value of K
a) 1
b) 5
c) 6
d) 7
Answers
Answer:
10. a) 2 (as when we divide 50/2, we get 25 which 5²)
11.c) 4 ( square of 2 that is 2²)
12. a) 3 ( 81/3= 27 which is cube of 3³)
13. a) 10 (1000= 10×10×10 which is 10³)
14. none of them are correct because
12×1= 2×2×3 (not a cube)
12×5=60= 2×2×3×5 (not a cube)
12×6= 72= 2³×3²(not a cube)
12×7= 84= 2²×3×7 (not a cube)
Either the question is wrong or the options..
I hope it will help you...
Answer:
Step-by-step explanation:
10) 2 , 50 divided by 2 to get 25 ,that is a perfect square. 5×5 = 25. Answer is (a).
11) 8, because 8= 2^3 (2 cube) = 2×2×2=8.Answer is (d).
12) 3, because 81 is divided by 3 we get 27.so 27 = 3×3×3 = (3 cube ).Answer is (a).
13)cube root of 1000 is 10 . 10×10×10= (10 cube ).Answer is (a).
14) 5, because 125 is a perfect cube of 5. 5×5×5= 125(5 cube). k=5 is the answer.