21 - 30 of 49 Questions
# | Question | Ans |
---|---|---|
21. |
In triangle FGB, < G = 90o, < H = 60o, while in triangle XYZ, < X = 60o and < Y = 30o. Form XYZ write down the ratio equal to \(\frac{FG}{FH}\) A. \(\frac{YX}{ZX}\) B. \(\frac{YX}{YZ}\) C. \(\frac{ZX}{YZ}\) D. \(\frac{YZ}{XY}\) Detailed SolutionThe two triangles are similar\(\frac{FG}{YZ}\) = \(\frac{FH}{XY}\) = \(\frac{GH}{YZ}\) = \(\frac{FG}{FH}\) = \(\frac{YZ}{XZ}\) |
|
22. |
A pentagon has four of its angles equal. If the size of the fifth angle is 60o, Find the size of each of the four equal angles. A. 60o B. 108o C. 120o D. 150o E. None of the above Detailed SolutionThe sum of interior angle of pentagon(5 sides) = (2n - 4) x 90o n = 5 (2 x 5 - 4) x 90o = 6 x 90o = 540o 540o - 60o = 480o \(\div\) 4 = 120o |
|
23. |
Find the product of (2\(\sqrt{y - 3y}\)) and (3y = 2y) A. 4y = y2 B. 4y + 9y2 C. 4y - 9y2 D. -4y - 9y2 E. 2y + y2 Detailed Solution(2\(\sqrt{y - 3y}\))(3y = 2y)= 6y y + 4y - 9y2 - 6y\(\sqrt{y}\) = 4y - 9y2 |
|
24. |
(\(\frac{x^a}{x^b}\))a + b by (\(\frac{x^{a + b}}{x^{a - b}}\))\(\frac{a^2}{b}\) A. x-a2 B. xb2 C. xa2 - b2 D. \(\frac{1}{x^{a2 + b2}}\) E. xb2 - a2 Detailed Solution(\(\frac{x^a}{x^b}\))a + b = (\(\frac{x^{a2 + ab}}{x^{b2 + ab}}\))= xa2 - b2 {\(\frac{xa + b}{xa - b}\)} = xa + b - a + b = x2b = x2a = xa2 - b2 = xb2 \(\div \) a2 = \(\frac{1}{x^\text a2 + b2}\) |
|
25. |
What will be the value of k so that the quadratic equation kx2 - 4x + 1 = 0 has two equal roots? A. 2 B. 3 C. 4 D. 8 E. \(\frac{1}{4}\) Detailed Solutionkx2 - 4x + 1 = 0, comparing with ax2 + bx + c = 0a = k, b = -4, c = 1 for equal root b2 = 4ac (-4)2 = 4k k = \(\frac{16}{4}\) = 4 |
|
26. |
Find the solution of the equation x + 2\(\sqrt{x - 8}\) = 0 A. (4, 16) B. (2, 4) C. (4, 1) D. (1, 16) E. (16, 16) Detailed Solutionx + 2\(\sqrt{x - 8}\) = 0, Let x = yx = y2 y2 + 2y - 8 = 0 (y + 4)(x - 2) = 0 y = -4 or 2 x = 16 or 4 |
|
27. |
If it is given that 5x + 1 + 5x = 150, then the value of x is equal to A. 3 B. 4 C. 1 D. 2 E. \(\frac{1}{2}\) Detailed Solution5x + 1 + 5x = 1505(5x) + 5x = 150 6(5x) = 150 5x = \(\frac{150}{6}\) = 25 = 52 = 2 |
|
28. |
Solve the system of equation 2x + y = 32, 33y - x = 27 A. (3, 2) B. (-3, 2) C. (3, -2) D. (-3, -2) E. (2, 2) Detailed Solution2x + y = 32, 33y - x = 272x + y = 25 33y + x = 33 x + y = 5 \(\frac{3y - x = 3}{4y = 8}\) y = 2 |
|
29. |
Simplify the given expression \(\sqrt{\frac{1 - cos x}{1 + cos x}}\) A. \(\frac{1 - cos x}{sin x}\) B. 1 - cos x C. sin x D. 1 + cos x E. \(\frac{1 + cos x}{sin x}\) Detailed Solution\(\sqrt{\frac{1 - cos x}{1 + cos x}}\) = aa2 = \(\frac{1 - cosx}{1 + cosx}\) \(\frac{1 - cosx}{1 + cosx}\) = \(\frac{1 - cosx}{1 - cosx}\) = \(\frac{(1 - cosx)^2}{cos^2 x}\) a2 = \(\frac{(1 - cos x)^2}{sin^2 x}\) a = \(\frac{1 - cos x}{sin x}\) |
|
30. |
Find the area of the curved surface of a cone whose base radius is 6cm and whose height is 8cm. (take \(\pi\) = \(\frac{22}{7}\)) A. 188.57cm2 B. 1320cm2 C. 188cm2 D. 188.08cm2 E. 10cm2 Detailed SolutionS = curved surface area = \(\pi\)rL= \(\frac{22}{7}\) x 6 x 10 = 188.57cm2 |
21. |
In triangle FGB, < G = 90o, < H = 60o, while in triangle XYZ, < X = 60o and < Y = 30o. Form XYZ write down the ratio equal to \(\frac{FG}{FH}\) A. \(\frac{YX}{ZX}\) B. \(\frac{YX}{YZ}\) C. \(\frac{ZX}{YZ}\) D. \(\frac{YZ}{XY}\) Detailed SolutionThe two triangles are similar\(\frac{FG}{YZ}\) = \(\frac{FH}{XY}\) = \(\frac{GH}{YZ}\) = \(\frac{FG}{FH}\) = \(\frac{YZ}{XZ}\) |
|
22. |
A pentagon has four of its angles equal. If the size of the fifth angle is 60o, Find the size of each of the four equal angles. A. 60o B. 108o C. 120o D. 150o E. None of the above Detailed SolutionThe sum of interior angle of pentagon(5 sides) = (2n - 4) x 90o n = 5 (2 x 5 - 4) x 90o = 6 x 90o = 540o 540o - 60o = 480o \(\div\) 4 = 120o |
|
23. |
Find the product of (2\(\sqrt{y - 3y}\)) and (3y = 2y) A. 4y = y2 B. 4y + 9y2 C. 4y - 9y2 D. -4y - 9y2 E. 2y + y2 Detailed Solution(2\(\sqrt{y - 3y}\))(3y = 2y)= 6y y + 4y - 9y2 - 6y\(\sqrt{y}\) = 4y - 9y2 |
|
24. |
(\(\frac{x^a}{x^b}\))a + b by (\(\frac{x^{a + b}}{x^{a - b}}\))\(\frac{a^2}{b}\) A. x-a2 B. xb2 C. xa2 - b2 D. \(\frac{1}{x^{a2 + b2}}\) E. xb2 - a2 Detailed Solution(\(\frac{x^a}{x^b}\))a + b = (\(\frac{x^{a2 + ab}}{x^{b2 + ab}}\))= xa2 - b2 {\(\frac{xa + b}{xa - b}\)} = xa + b - a + b = x2b = x2a = xa2 - b2 = xb2 \(\div \) a2 = \(\frac{1}{x^\text a2 + b2}\) |
|
25. |
What will be the value of k so that the quadratic equation kx2 - 4x + 1 = 0 has two equal roots? A. 2 B. 3 C. 4 D. 8 E. \(\frac{1}{4}\) Detailed Solutionkx2 - 4x + 1 = 0, comparing with ax2 + bx + c = 0a = k, b = -4, c = 1 for equal root b2 = 4ac (-4)2 = 4k k = \(\frac{16}{4}\) = 4 |
26. |
Find the solution of the equation x + 2\(\sqrt{x - 8}\) = 0 A. (4, 16) B. (2, 4) C. (4, 1) D. (1, 16) E. (16, 16) Detailed Solutionx + 2\(\sqrt{x - 8}\) = 0, Let x = yx = y2 y2 + 2y - 8 = 0 (y + 4)(x - 2) = 0 y = -4 or 2 x = 16 or 4 |
|
27. |
If it is given that 5x + 1 + 5x = 150, then the value of x is equal to A. 3 B. 4 C. 1 D. 2 E. \(\frac{1}{2}\) Detailed Solution5x + 1 + 5x = 1505(5x) + 5x = 150 6(5x) = 150 5x = \(\frac{150}{6}\) = 25 = 52 = 2 |
|
28. |
Solve the system of equation 2x + y = 32, 33y - x = 27 A. (3, 2) B. (-3, 2) C. (3, -2) D. (-3, -2) E. (2, 2) Detailed Solution2x + y = 32, 33y - x = 272x + y = 25 33y + x = 33 x + y = 5 \(\frac{3y - x = 3}{4y = 8}\) y = 2 |
|
29. |
Simplify the given expression \(\sqrt{\frac{1 - cos x}{1 + cos x}}\) A. \(\frac{1 - cos x}{sin x}\) B. 1 - cos x C. sin x D. 1 + cos x E. \(\frac{1 + cos x}{sin x}\) Detailed Solution\(\sqrt{\frac{1 - cos x}{1 + cos x}}\) = aa2 = \(\frac{1 - cosx}{1 + cosx}\) \(\frac{1 - cosx}{1 + cosx}\) = \(\frac{1 - cosx}{1 - cosx}\) = \(\frac{(1 - cosx)^2}{cos^2 x}\) a2 = \(\frac{(1 - cos x)^2}{sin^2 x}\) a = \(\frac{1 - cos x}{sin x}\) |
|
30. |
Find the area of the curved surface of a cone whose base radius is 6cm and whose height is 8cm. (take \(\pi\) = \(\frac{22}{7}\)) A. 188.57cm2 B. 1320cm2 C. 188cm2 D. 188.08cm2 E. 10cm2 Detailed SolutionS = curved surface area = \(\pi\)rL= \(\frac{22}{7}\) x 6 x 10 = 188.57cm2 |