11). Value of \( \Large \left( \frac{2^{-3}}{5} \right) ^{-2}\) is
| A). \( \Large \frac{1}{1600} \) |
| B). 1600 |
| C). \( \Large \frac{1}{40} \) |
| D). 40 |
|
12). If \( \Large x^{-2/3} \) = \( \Large \frac{1}{4} \) and x is a positive whole number, then the value of 2x is
| A). 8 |
| B). 16 |
| C). 24 |
| D). 32 |
|
13). If \(x^2 \) = 64 and \(y^2 \) = 49, then difference between greatest possible value of (x - y) and least possible value of (x + y) is
| A). 0 |
| B). 10 |
| C). 15 |
| D). 30 |
|
14). No square of a number ends with
| A). 2,3,7 and 8 |
| B). 3,5,6 and 8 |
| C). 2,5,7 and 9 |
| D). 2,3,7 and 9 |
|
15). If \( 4^2 + 5^2 +x^2 = 21^2 \), then the value of x is
| A). 9 |
| B). 12 |
| C). 15 |
| D). 20 |
|
16). The students of a class donated Rs.2401 Each student donated as many rupees as the number of students in the class, then the number of students in the class is
| A). 25 |
| B). 49 |
| C). 81 |
| D). 119 |
|
17). The least square number which is exactly divisible by each of these number 6,9,15 and 20 is
| A). 400 |
| B). 900 |
| C). 961 |
| D). 1024 |
|
18). Value of \( \Large\left[ \left( 24^2 + 7^2 \right)^{1/2} \right] ^3 \) is
| A). 625 |
| B). 1025 |
| C). 15625 |
| D). 10245 |
|
19). Three numbers are in the ration 1:2:3. If the sum of their cubes is 98784, then the numbers are
| A). 7,14,28 |
| B). 14,28,42 |
| C). 6,12,18 |
| D). 12,18,36 |
|
20). For what value of x, \( \Large 3^{3x - 5} = \frac{1}{9^x} \)?
|
