Mathematics/General Ability MCQs
Topic Notes: Mathematics/General Ability
MCQs and preparation resources for competitive exams, covering important concepts, past papers, and detailed explanations.
Plato
- Biography: Ancient Greek philosopher (427–347 BCE), student of Socrates and teacher of Aristotle, founder of the Academy in Athens.
- Important Ideas:
- Theory of Forms
- Philosopher-King
- Ideal State
211
Calculate: sqrt(121)
Answer:
11
Finding the square root of 121 means identifying what positive number squared gives 121. The answer is 11, because 11 * 11 = 121.
212
Simplify: 7^1 * 7^6
Answer:
7^7
The product rule tells us to add the exponents when the base is identical. Adding the exponent 1 to the exponent 6 gives a final power of 7, so the answer is 7^7.
213
The fraction 10127 / 100000 in decimal form is:
Answer:
0.10127
To convert the fraction to a decimal, divide 10127 by 100000. This is done by shifting the decimal point five places to the left, which results in 0.10127.
214
What is the value of $\frac{5}{8} \div \frac{3}{4}$?
Answer:
$\frac{5}{6}$
To divide one fraction by another, you must multiply the first fraction by the reciprocal of the second fraction. The reciprocal of $\frac{3}{4}$ is $\frac{4}{3}$. So, the calculation becomes $\frac{5}{8} \times \frac{4}{3}$. Multiplying the numerators ($5 \times 4 = 20$) and the denominators ($8 \times 3 = 24$) gives $\frac{20}{24}$. This fraction can be simplified by finding the greatest common divisor of 20 and 24, which is 4. Dividing the numerator and denominator by 4 ($20 \div 4 = 5$ and $24 \div 4 = 6$) gives the final simplified answer of $\frac{5}{6}$.
215
Find the sum of: 555.05 + 55.5 + 5.55 + 5 + 0.55
Answer:
621.65
Combining the whole numbers and fractional parts: 555.05 + 55.50 + 5.55 + 5.00 + 0.55 leads mathematically to a total value of 621.65.
216
Evaluate: 7*sqrt(7) - sqrt(7)
Answer:
6*sqrt(7)
The second term has an implicit coefficient of 1. Subtracting 1 from 7 gives 6. The radical part remains the same, producing 6*sqrt(7).
217
Simplify the expression: 4^9 / 4^3
Answer:
4^6
Since the bases are the same, we simply subtract the exponents. Subtracting 3 from 9 leaves an exponent of 6, making the simplified form 4^6.
218
Subtract: sqrt(18) - sqrt(8)
Answer:
sqrt(2)
Simplify both terms first: sqrt(18) = 3*sqrt(2) and sqrt(8) = 2*sqrt(2). Subtracting them gives 3*sqrt(2) - 2*sqrt(2) = 1*sqrt(2), which is just sqrt(2).
219
What is the cube root of 343?
Answer:
7
The cube root of 343 is a number that, when raised to the third power, yields 343. That number is 7, because 7^3 = 343.
220
Simplify the expression: x^9 / x^4
Answer:
x^5
According to the quotient rule for exponents, we subtract the bottom exponent from the top exponent when bases are the same. Subtracting 4 from 9 gives us x^5.