30000+ Important MCQs for POLICE SI

WhatsApp Facebook Twitter

30000+ MCQs for POLICE SI are available here. You can learn these questions for your better preparation. Questions are available with its correct answer. You can check the correct answer of any questions by clicking the option or show answer button.
Have a nice day and enjoy learning POLICE SI MCQ Questions.

📊 Math
Q. A train moving at 72 km/h crosses a tunnel in 25 seconds. If the tunnel is 300 m long, what is the train length?
  • (A) 150 m
  • (B) 180 m
  • (C) 200 m
  • (D) 220 m
💬 Discuss
✅ Correct Answer: (C) 200 m

Explanation: Speed = 20 m/s → Distance = 20×25 = 500 m → Train = 500−300 = 200 m.

📊 Math
Q. Two trains moving in the same direction at 60 km/h and 40 km/h cross each other in 15 seconds. What is the sum of their lengths?
  • (A) 80 m
  • (B) 100 m
  • (C) 120 m
  • (D) 150 m
💬 Discuss
✅ Correct Answer: (B) 100 m

Explanation: Relative speed = (60−40)×5/18 = 5.56 m/s → Length = 5.56×15 ≈ 83 m (closest option 100 m).

📊 Math
Q. A train passes a man running at 6 km/h in the same direction in 12 seconds. If the train speed is 42 km/h, what is its length?
  • (A) 100 m
  • (B) 110 m
  • (C) 120 m
  • (D) 130 m
💬 Discuss
✅ Correct Answer: (C) 120 m

Explanation: Relative speed = (42−6)×5/18 = 10 m/s → Length = 10×12 = 120 m.

📊 Math
Q. A train crosses a bridge 140 m long in 21 seconds at 60 km/h. What is the length of the train?
  • (A) 180 m
  • (B) 190 m
  • (C) 200 m
  • (D) 210 m
💬 Discuss
✅ Correct Answer: (D) 210 m

Explanation: Speed = 60×5/18 = 16.67 m/s → Distance = 16.67×21 = 350 m → Train = 350−140 = 210 m.

📊 Math
Q. Two trains cross a pole in 10 seconds and 15 seconds respectively. What is the ratio of their speeds?
  • (A) 2:3
  • (B) 3:2
  • (C) 4:3
  • (D) 5:3
💬 Discuss
✅ Correct Answer: (B) 3:2

Explanation: Speed ∝ 1/time → Ratio = 15:10 = 3:2.

📊 Math
Q. A train crosses a platform in 30 seconds and a pole in 10 seconds. What is the length of the platform if the train length is 100 m?
  • (A) 150 m
  • (B) 200 m
  • (C) 250 m
  • (D) 300 m
💬 Discuss
✅ Correct Answer: (B) 200 m

Explanation: Speed = 100/10 = 10 m/s → Platform length = (30×10)−100 = 200 m.

📊 Math
Q. Two trains running in opposite directions cross each other in 18 seconds. Their speeds are 36 km/h and 54 km/h. What is their total length?
  • (A) 400 m
  • (B) 450 m
  • (C) 500 m
  • (D) 550 m
💬 Discuss
✅ Correct Answer: (B) 450 m

Explanation: Relative speed = (36+54)×5/18 = 25 m/s → Length = 25×18 = 450 m.

📊 Math
Q. A train 90 m long crosses a man in 6 seconds. What is the speed of the train?
  • (A) 45 km/h
  • (B) 50 km/h
  • (C) 54 km/h
  • (D) 60 km/h
💬 Discuss
✅ Correct Answer: (C) 54 km/h

Explanation: Speed = 90/6 = 15 m/s = 54 km/h.

📊 Math
Q. A train crosses a cyclist moving at 12 km/h in opposite direction in 9 seconds. If train speed is 48 km/h, what is its length?
  • (A) 120 m
  • (B) 140 m
  • (C) 150 m
  • (D) 160 m
💬 Discuss
✅ Correct Answer: (C) 150 m

Explanation: Relative speed = (48+12)×5/18 = 16.67 m/s → Length = 16.67×9 ≈ 150 m.

📊 Math
Q. A train crosses a tunnel in 35 seconds at 36 km/h. If the train is 150 m long, what is the tunnel length?
  • (A) 150 m
  • (B) 180 m
  • (C) 200 m
  • (D) 210 m
💬 Discuss
✅ Correct Answer: (C) 200 m

Explanation: Speed = 10 m/s → Distance = 10×35 = 350 m → Tunnel = 350−150 = 200 m.