CBSE Class 8 Maths MCQs on Ratios and Comparison of Quantities
CBSE Class 8 Maths MCQs on Ratios and Comparison of Quantities
Class: 8
Subject: Mathematics
Chapter 7: Proportional Reasoning
Topic: Ratios & Comparison of Quantities
Subject: Mathematics
Chapter 7: Proportional Reasoning
Topic: Ratios & Comparison of Quantities
Strictly Based on CBSE Curriculum | As per NCERT Textbook | Ideal for CBSE Class 8 Examination Preparation
Q1. The ratio of 20 to 25 in simplest form is:
Correct Answer: A) 4:5
Explanation: Divide both terms by 5 → 20÷5 : 25÷5 = 4:5.
Explanation: Divide both terms by 5 → 20÷5 : 25÷5 = 4:5.
Q2. Express 3/4 as a ratio:
Correct Answer: A) 3:4
Explanation: A fraction a/b can be written as a:b.
Explanation: A fraction a/b can be written as a:b.
Q3. The ratio 5:15 is equal to:
Correct Answer: A) 1:3
Explanation: Divide both by 5.
Explanation: Divide both by 5.
Q4. If a:b = 2:3 and a = 10, then b =
Correct Answer: B) 15
Explanation: 2 parts = 10 → 1 part = 5 → 3 parts = 15.
Explanation: 2 parts = 10 → 1 part = 5 → 3 parts = 15.
Q5. 25% of 200 is:
Correct Answer: B) 50
Explanation: 25% = 25/100 × 200 = 50.
Explanation: 25% = 25/100 × 200 = 50.
Q6. Convert 0.5 into percentage:
Correct Answer: B) 50%
Explanation: 0.5 × 100 = 50%.
Explanation: 0.5 × 100 = 50%.
Q7. If the ratio of boys to girls is 3:2 and total students are 25, number of boys =
Correct Answer: B) 15
Explanation: Total parts = 5; 25÷5=5; boys=3×5=15.
Explanation: Total parts = 5; 25÷5=5; boys=3×5=15.
Q8. Increase 100 by 20%:
Correct Answer: B) 120
Explanation: 20% of 100 = 20; total = 120.
Explanation: 20% of 100 = 20; total = 120.
Q9. Decrease 200 by 10%:
Correct Answer: A) 180
Explanation: 10% of 200 = 20; 200 − 20 = 180.
Explanation: 10% of 200 = 20; 200 − 20 = 180.
Q10. 2:5 and 6:15 are:
Correct Answer: A) Equal ratios
Explanation: Both simplify to 2:5.
Explanation: Both simplify to 2:5.
Q11. 40% written as fraction is:
Correct Answer: D) Both A and B
Explanation: 40/100 = 4/10 = 2/5.
Explanation: 40/100 = 4/10 = 2/5.
Q12. Ratio of 1 hour to 30 minutes is:
Correct Answer: C) 2:1
Explanation: 60 min : 30 min = 2:1.
Explanation: 60 min : 30 min = 2:1.
Q13. If price increases from ₹100 to ₹120, % increase is:
Correct Answer: C) 20%
Explanation: Increase = 20; 20/100 × 100 = 20%.
Explanation: Increase = 20; 20/100 × 100 = 20%.
Q14. 75% of 400 =
Correct Answer: C) 300
Explanation: 75/100 × 400 = 300.
Explanation: 75/100 × 400 = 300.
Q15. 3/5 expressed as percentage is:
Correct Answer: B) 60%
Explanation: (3÷5)×100 = 60%.
Explanation: (3÷5)×100 = 60%.
Q16. Equivalent ratio of 4:7 is:
Correct Answer: A) 8:14
Explanation: Multiply both by 2.
Explanation: Multiply both by 2.
Q17. If 5 pens cost ₹50, cost of 1 pen is:
Correct Answer: B) ₹10
Explanation: 50÷5 = 10.
Explanation: 50÷5 = 10.
Q18. 0.25 as percentage is:
Correct Answer: B) 25%
Explanation: 0.25 × 100 = 25%.
Explanation: 0.25 × 100 = 25%.
Q19. If a quantity doubles, % increase is:
Correct Answer: C) 100%
Explanation: Doubling means increase equal to original value.
Explanation: Doubling means increase equal to original value.
Q20. Ratio of ₹50 to ₹2 is:
Correct Answer: B) 25:1
Explanation: Divide both by 2.
Explanation: Divide both by 2.
