2. The largest four digit number which is a perfect cube, is:
7000
8000
9261
9999
Answer: Option C
Explanation:
21*21*21 = 9261
3. What is the smallest number by which 3600 be divided to make it a perfect cube.
450
445
440
430
Answer: Option A
Explanation:
\begin{aligned}
3600 = 2^3 \times 5^2 \times 3^2 \times 2
\end{aligned}
To make it a perfect cube it must be divided by
\begin{aligned}
5^2 \times 3^2 \times 2 = 450
\end{aligned}
4. The cube root of .000216 is
0.6
0.006
0.06
.0006
Answer: Option C
5. Find the value of X
\begin{aligned} \sqrt{81} + \sqrt{0.81} = 10.09 - X \end{aligned}
0.019
0.19
0.9
0.109
Answer: Option B
Explanation:
\begin{aligned}
=> \sqrt{81} + \sqrt{0.81} = 10.09 - X
\end{aligned}
\begin{aligned}
=> 9 + 0.9 = 10.09 - X
\end{aligned}
\begin{aligned}
=> X = 10.09 - 9.9 = 0.19
\end{aligned}