CBSE Class 8 Maths MCQs on Inverse Proportion and Real-Life Applications
CBSE Class 8 Maths MCQs on Inverse Proportion and Real-Life Applications
Class: 8
Subject: Mathematics
Chapter 7: Proportional Reasoning
Topic: Inverse Proportion & Applications
Subject: Mathematics
Chapter 7: Proportional Reasoning
Topic: Inverse Proportion & Applications
Strictly Based on CBSE Curriculum | As per NCERT Textbook | Ideal for CBSE Class 8 Examination Preparation
Q1. Two quantities are in inverse proportion if:
Correct Answer: B) Their product is constant
Explanation: In inverse proportion, x × y = constant.
Explanation: In inverse proportion, x × y = constant.
Q2. If 4 workers complete a job in 6 days, 8 workers will complete it in:
Correct Answer: C) 3 days
Explanation: More workers, less time. 4×6 = 8×x → x=3.
Explanation: More workers, less time. 4×6 = 8×x → x=3.
Q3. If speed increases, time taken for same distance:
Correct Answer: B) Decreases
Explanation: Speed and time are inversely proportional.
Explanation: Speed and time are inversely proportional.
Q4. If 6 taps fill tank in 4 hours, 3 taps will take:
Correct Answer: D) 8 hours
Explanation: 6×4 = 3×x → x=8.
Explanation: 6×4 = 3×x → x=8.
Q5. If 5 men finish work in 12 days, 10 men will finish in:
Correct Answer: B) 6 days
Explanation: Men double → days half.
Explanation: Men double → days half.
Q6. In inverse proportion graph is:
Correct Answer: C) Curve (hyperbola)
Explanation: Graph of y = k/x.
Explanation: Graph of y = k/x.
Q7. If 8 machines produce goods in 10 days, 4 machines take:
Correct Answer: B) 20 days
Explanation: 8×10 = 4×x → x=20.
Explanation: 8×10 = 4×x → x=20.
Q8. If number of workers decreases, time taken:
Correct Answer: B) Increases
Explanation: Inverse relation.
Explanation: Inverse relation.
Q9. If car travels faster, time taken for fixed distance:
Correct Answer: B) Less
Explanation: Speed × Time = constant.
Explanation: Speed × Time = constant.
Q10. If 12 men complete work in 5 days, 6 men will take:
Correct Answer: A) 10 days
Explanation: 12×5 = 6×x → x=10.
Explanation: 12×5 = 6×x → x=10.
Q11. If 3 trucks carry goods in 4 trips, 6 trucks need:
Correct Answer: C) 2 trips
Explanation: Trucks double → trips half.
Explanation: Trucks double → trips half.
Q12. In inverse proportion, if one doubles, other becomes:
Correct Answer: B) Half
Explanation: Product constant.
Explanation: Product constant.
Q13. If 5 taps fill tank in 8 hours, 10 taps fill in:
Correct Answer: C) 4 hours
Explanation: 5×8 = 10×x → x=4.
Explanation: 5×8 = 10×x → x=4.
Q14. If 15 workers build wall in 12 days, 5 workers take:
Correct Answer: A) 36 days
Explanation: 15×12 = 5×x → x=36.
Explanation: 15×12 = 5×x → x=36.
Q15. If distance is fixed, speed and time are:
Correct Answer: B) Inversely proportional
Explanation: Speed × Time = Distance.
Explanation: Speed × Time = Distance.
Q16. If 2 pumps empty tank in 9 hours, 3 pumps empty in:
Correct Answer: A) 6 hours
Explanation: 2×9 = 3×x → x=6.
Explanation: 2×9 = 3×x → x=6.
Q17. If 4 persons complete task in 15 days, 1 person takes:
Correct Answer: C) 60 days
Explanation: 4×15 = 1×x → x=60.
Explanation: 4×15 = 1×x → x=60.
Q18. If speed halves, time becomes:
Correct Answer: B) Double
Explanation: Inverse relation.
Explanation: Inverse relation.
Q19. If 20 workers finish job in 2 days, 10 workers take:
Correct Answer: D) 4 days
Explanation: 20×2 = 10×x → x=4.
Explanation: 20×2 = 10×x → x=4.
Q20. In inverse proportion, if one increases, other:
Correct Answer: B) Decreases
Explanation: They vary oppositely.
Explanation: They vary oppositely.
