Rational Numbers (8 Mathematics)
Master rational numbers, their properties, and operations. Learn about fractions, decimals, and how to work with numbers expressed as ratios.
TL;DR: Master rational numbers, their properties, and operations. Learn about fractions, decimals, and how to work with numbers expressed as ratios.
Written & reviewed by the Syllab.in Academic Team (CBSE/NCERT subject experts) · Updated
Master rational numbers, their properties, and operations. Learn about fractions, decimals, and how to work with numbers expressed as ratios.
Rational Numbers MCQs with Answers & Explanations
Q1. What is a rational number?
- Any number
- A number that can be expressed as p/q where q ≠ 0 ✓ (correct)
- Only positive numbers
- Only integers
Q2. Which of the following is a rational number?
- √2
- π
- 1.5 ✓ (correct)
- √3
Q3. What is the additive identity of rational numbers?
- 1
- 0 ✓ (correct)
- -1
- ∞
Q4. What is the multiplicative identity of rational numbers?
- 0
- 1 ✓ (correct)
- -1
- ∞
Q5. What is the additive inverse of 3/4?
- 4/3
- -3/4 ✓ (correct)
- 3/4
- 1
Q6. What is the multiplicative inverse of 2/5?
- 5/2 ✓ (correct)
- -2/5
- 2/5
- 0
Q7. Simplify: 2/3 + 1/4
- 3/7
- 8/12
- 11/12 ✓ (correct)
- 3/12
Q8. Simplify: 3/5 × 10/9
- 2/3 ✓ (correct)
- 30/45
- 3/9
- 5/3
Q9. Which property states that a + b = b + a?
- Associative
- Commutative ✓ (correct)
- Distributive
- Identity
Q10. What is the value of -2/3 ÷ 4/9?
- -3/2 ✓ (correct)
- -8/27
- -6/4
- 8/27
Frequently Asked Questions
Is every integer a rational number?
Yes, every integer is a rational number. Any integer n can be expressed as n/1, which is in the form p/q. For example, 5 = 5/1.
What is the difference between rational and irrational numbers?
Rational numbers can be expressed as p/q (like 1/2, 0.5, 3). Irrational numbers cannot (like √2, π, e). Together they form all real numbers.
More 8 Mathematics MCQs
- Coordinate Geometry
- Arithmetic Progressions
- Circles
- Surface Areas and Volumes
- Trigonometry (Applications Case Study)
- Probability (Case Study)
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