Mathematics · Quantitative Aptitude
Surds and Indices
408 Questions
Surds and indices questions focus on evaluating square roots, cube roots, and fractional exponents. These topics are a core part of the quantitative aptitude section in many competitive exams. Practicing these problems builds speed and accuracy for solving numerical equations.
Square roots evaluationCube roots calculationExponents and powersFractional exponentsSurds multiplication
Surds and Indices Questions
C
Correct answer
Explanation
The square root of 3 is approximately 1.73205. 1.414 is the square root of 2, and the other values provided (2.546, 1.221) are mathematically unrelated to the square root of 3.
C
Correct answer
Explanation
The square root of 3 is approximately 1.732. This is a commonly used surd value in mathematical calculations and geometry problems. Options A (2.546), B (1.144), and D (1.221) are incorrect decimal approximations.
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-1
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2
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both
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3
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infinity
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none of the above
B
Correct answer
Explanation
Let x = sqrt(2 + x). Squaring both sides gives x² = 2 + x, or x² - x - 2 = 0. Factoring gives (x - 2)(x + 1) = 0. Since the square root must be positive, x = 2.
C
Correct answer
Explanation
Multiply the exponents: (2/3) * (2/3) * (3/4) = 1/3. The expression simplifies to 512^(1/3). Since 8^3 = 512, the cube root of 512 is 8.
B
Correct answer
Explanation
The cube root of 216 is 6. Since there are six decimal places in .000216, the cube root must have two decimal places (6/3 = 2). Thus, the result is 0.06.
B
Correct answer
Explanation
Using the identity (a+b)(a-b) = a² - b², we have: (7 + 3√5)(7 - 3√5) = 7² - (3√5)² = 49 - 9(5) = 49 - 45 = 4. The square root of 4 is 2. This is a direct application of the difference of squares formula.
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10
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100
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1000
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none of these
B
Correct answer
Explanation
To solve this question, the user needs to know how to solve equations involving square roots and basic arithmetic. The user must also understand that the square root of a product is equal to the product of the square roots.
We start by isolating the variable in the equation:
$$\sqrt{0.0169x} = 1.3$$
We can then solve for x by squaring both sides of the equation:
$$0.0169x = 1.69$$
$$x = \frac{1.69}{0.0169} = 100$$
Therefore, the answer is option B: 100, since it is the only value that satisfies the equation.
Option A and C are incorrect since they are not the correct value of x that satisfies the equation. Option D is also incorrect since we have found a value of x that satisfies the equation, which is 100.
C
Correct answer
Explanation
To find the square root of 64009, note that 250^2 = 62500 and 260^2 = 67600. Since the last digit is 9, the root must end in 3 or 7. Testing 253: 253 * 253 = 64009.
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Cube Root
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Square Root
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Square
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Cube
B
Correct answer
Explanation
Vargamul is a Sanskrit mathematical term derived from 'varga' (square) and 'mul' (root), literally meaning 'square root'. In mathematics, it refers specifically to the square root of a number. This distinguishes it from cube root, square, or cube.
D
Correct answer
Explanation
To find the square root of 4761, note that it ends in 1, so the root must end in 1 or 9. Since 60 squared is 3600 and 70 squared is 4900, the root must be 69.
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(abs (sqrt 8))
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(modulo (ceiling (sqrt 8)) 2)
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(max (floor (sqrt 8)) (round (sqrt 8)))
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(min (truncate (sqrt 8)) (abs (sqrt 8)))
C
Correct answer
Explanation
Evaluating (sqrt 8) gives approximately 2.828. (floor 2.828) is 2.0, while (round 2.828) is 3.0. The max of 2.0 and 3.0 is 3.0. The other options evaluate to 2.828, 1, and 2 respectively, making this choice correct.
A
Correct answer
Explanation
In Unix/Linux systems, the root user has both UID (User ID) and GID (Group ID) set to 0. This is a fundamental system convention - the value 0 uniquely identifies the superuser with unrestricted privileges. Other user and group IDs start from 1 upwards for regular users and system accounts.
A
Correct answer
Explanation
The SQRT function in SQL calculates the square root of a numeric value. The square root of 25 is 5. Since DUAL is a dummy table in Oracle database, selecting SQRT(25) from it yields a single row containing the value 5.
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Var y = Math.sqrt(16);
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Var x = Maths.sqrt(16);
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Var z = Math.squareroot(16);
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Var y = Maths.squareroot(16);
A
Correct answer
Explanation
The Math object provides sqrt() as the correct method name. Option B and D use 'Maths' which doesn't exist. Option C uses 'squareroot' which is incorrect - the method is 'sqrt'. Option A correctly uses Math.sqrt() with proper capitalization.