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SubjectsMathematics
अपरिमेय संख्याएँ
In Class 10 Mathematics, this topic from the Real Numbers chapter introduces irrational numbers as numbers that cannot be expressed as a ratio of two integers. Students learn to identify them through non-terminating, non-repeating decimal expansions, distinguish them from rational numbers, and locate them on the number line. The topic also develops understanding of examples such as √2 and how irrational numbers fit into the wider system of real numbers.
Correct answer: A. (\sqrt{14})
Explanation: Step 1: An irrational number cannot be written exactly in the form (\frac{p}{q}). Step 2: (14) is not a perfect square, so (\sqrt{14}) is irrational. Step 3: In square-root questions, first check whether the number inside is a perfect square.
Correct answer: B. Rational number
Explanation: Step 1: (121) is a perfect square. Step 2: (\sqrt{121}=11), and (11) can be written as (\frac{11}{1}). Step 3: Square roots of perfect squares are rational.
Correct answer: C. (0.01001000100001\ldots)
Explanation: Step 1: Terminating and recurring decimals are rational. Step 2: (0.01001000100001\ldots) has no fixed repeating pattern, so it is non-terminating and non-recurring. Step 3: For decimals, check the repetition pattern, not just the length.
Correct answer: B. (6\sqrt{3})
Explanation: Step 1: Write (108=36 \times 3). Step 2: (\sqrt{108}=\sqrt{36 \times 3}=6\sqrt{3}). Step 3: While simplifying a square root, choosing the largest perfect square factor is helpful.
Correct answer: C. It is irrational
Explanation: Step 1: (\sqrt{7}) is irrational and (4) is rational. Step 2: Adding a rational number does not remove the irrational part. Step 3: The sum of a rational and an irrational number is generally irrational.
Correct answer: B. (10)
Explanation: Step 1: In multiplication of square roots, multiply the numbers inside. Step 2: (\sqrt{2}\times\sqrt{50}=\sqrt{100}=10). Step 3: The product of two irrational numbers can sometimes be rational.
Correct answer: C. (\sqrt{144})
Explanation: Step 1: To find the rational option, look for the square root of a perfect square. Step 2: (144) is a perfect square and (\sqrt{144}=12). Step 3: Recognising perfect squares makes such questions very quick.
Correct answer: A. (4\sqrt{3})
Explanation: Step 1: (\sqrt{27}=3\sqrt{3}). Step 2: (\sqrt{3}+3\sqrt{3}=4\sqrt{3}). Step 3: Before adding, simplify radicals and make them like terms.
Correct answer: B. (\frac{5}{6})
Explanation: Step 1: (\frac{5}{6}) is a rational number. Step 2: Its decimal form is (0.8333\ldots), which is recurring. Step 3: Rational numbers have decimal expansions that are either terminating or recurring.
Correct answer: C. (2\sqrt{11})
Explanation: Step 1: Both terms have the same square root. Step 2: (\sqrt{11}+\sqrt{11}=2\sqrt{11}). Step 3: For like radicals, add only the coefficients, not the numbers inside the roots.
Correct answer: B. (0)
Explanation: Step 1: Subtracting a number from itself gives (0). Step 2: So (\sqrt{19}-\sqrt{19}=0), which is rational. Step 3: Ordinary subtraction rules also apply to irrational terms.
Correct answer: A. (15)
Explanation: Step 1: (\sqrt{3}\times\sqrt{75}=\sqrt{225}). Step 2: (\sqrt{225}=15), so the result is rational. Step 3: If the number inside becomes a perfect square after multiplication, the answer can be rational.
Correct answer: C. The square root of a perfect square is rational
Explanation: Step 1: Square roots of perfect squares are integers. Step 2: For example, (\sqrt{49}=7), so it is rational. Step 3: In statement-based questions, using an example helps check the truth.
Correct answer: A. (11\sqrt{2})
Explanation: Step 1: (242=121 \times 2). Step 2: (\sqrt{242}=\sqrt{121 \times 2}=11\sqrt{2}). Step 3: Recognising large perfect squares like (121) is very useful in simplification.
Correct answer: A. (4\sqrt{5})
Explanation: Step 1: (\sqrt{45}=3\sqrt{5}). Step 2: (\sqrt{5}+3\sqrt{5}=4\sqrt{5}). Step 3: While adding radicals, simplify them until like radicals appear.
Correct answer: C. (\sqrt{45})
Explanation: Step 1: Since (36<45<49), (6<\sqrt{45}<7). Step 2: (45) is not a perfect square, so (\sqrt{45}) is irrational. Step 3: In interval questions, use nearby perfect squares.
Correct answer: B. Irrational
Explanation: Step 1: (\sqrt{7}) is irrational. Step 2: Dividing it by the non-zero rational number (3) keeps the result irrational. Step 3: Division by a non-zero rational number does not remove irrationality.
Correct answer: B. (8,\sqrt{15})
Explanation: Step 1: (8) is rational. Step 2: (\sqrt{15}) is irrational because (15) is not a perfect square. Step 3: In pair questions, check the nature of both numbers separately.
Correct answer: C. (5\sqrt{7})
Explanation: Step 1: Write (175=25 \times 7). Step 2: (\sqrt{175}=\sqrt{25 \times 7}=5\sqrt{7}). Step 3: Take the perfect square factor outside and keep the remaining number inside.
Correct answer: A. (4\sqrt{10})
Explanation: Step 1: Four like radical terms are being added. Step 2: (\sqrt{10}+\sqrt{10}+\sqrt{10}+\sqrt{10}=4\sqrt{10}). Step 3: When adding like radicals, add only the coefficients.
Correct answer: A. (\sqrt{5})
Explanation: Step 1: (\sqrt{80}=4\sqrt{5}) and (\sqrt{45}=3\sqrt{5}). Step 2: (4\sqrt{5}-3\sqrt{5}=\sqrt{5}). Step 3: Before subtracting, simplify both radicals completely.
Correct answer: C. (13)
Explanation: Step 1: Squaring a square root gives the number inside it. Step 2: ((\sqrt{13})^2=13). Step 3: Apply ((\sqrt{a})^2=a) directly.
Correct answer: C. Irrational
Explanation: Step 1: (x=\sqrt{6}) is irrational. Step 2: (2x=2\sqrt{6}), and (2) is a non-zero rational number. Step 3: Multiplying an irrational number by a non-zero rational number keeps it irrational.
Correct answer: B. (\sqrt{64})
Explanation: Step 1: The question asks for the number that is not irrational, so look for a rational number. Step 2: (\sqrt{64}=8), which is rational. Step 3: Read negative wording carefully in such questions.
Correct answer: A. (12\sqrt{2})
Explanation: Step 1: (\sqrt{32}=4\sqrt{2}) and (\sqrt{128}=8\sqrt{2}). Step 2: (4\sqrt{2}+8\sqrt{2}=12\sqrt{2}). Step 3: Radicals can be added only when they become like radicals.
