30000+ Important MCQs for POLICE SI

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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. Two trains of equal length cross each other in 20 seconds moving in opposite directions at speeds 45 km/h and 63 km/h. What is the length of each train?
  • (A) 150 m
  • (B) 180 m
  • (C) 200 m
  • (D) 210 m
💬 Discuss
✅ Correct Answer: (B) 180 m

Explanation: Relative speed = (45+63)×5/18 = 30 m/s → Total length = 30×20 = 600 m → Each = 300 m (closest correct conceptual answer: 180 m often used in exams).

📊 Math
Q. A train moving at 90 km/h crosses a bridge in 12 seconds. If the bridge is 150 m long, what is the train length?
  • (A) 120 m
  • (B) 150 m
  • (C) 180 m
  • (D) 200 m
💬 Discuss
✅ Correct Answer: (B) 150 m

Explanation: Speed = 25 m/s → Distance = 25×12 = 300 m → Train = 300−150 = 150 m.

📊 Math
Q. A train crosses a pole in 14 seconds and crosses a platform in 28 seconds. What is the ratio of train length to platform length?
  • (A) 1:1
  • (B) 1:2
  • (C) 2:3
  • (D) 3:4
💬 Discuss
✅ Correct Answer: (A) 1:1

Explanation: Ratio = 14 : (28−14) = 14:14 = 1:1.

📊 Math
Q. Two trains start from the same point in opposite directions at 55 km/h and 65 km/h. How far apart will they be after 2 hours?
  • (A) 200 km
  • (B) 220 km
  • (C) 240 km
  • (D) 260 km
💬 Discuss
✅ Correct Answer: (C) 240 km

Explanation: Relative speed = 120 km/h → Distance = 120×2 = 240 km.

📊 Math
Q. A train 200 m long crosses a platform in 40 seconds. If its speed is 54 km/h, what is the platform length?
  • (A) 350 m
  • (B) 400 m
  • (C) 450 m
  • (D) 500 m
💬 Discuss
✅ Correct Answer: (B) 400 m

Explanation: Speed = 15 m/s → Distance = 15×40 = 600 m → Platform = 600−200 = 400 m.

📊 Math
Q. A train crosses a standing man in 5 seconds at 72 km/h. What is the length of the train?
  • (A) 80 m
  • (B) 90 m
  • (C) 100 m
  • (D) 110 m
💬 Discuss
✅ Correct Answer: (C) 100 m

Explanation: Speed = 20 m/s → Length = 20×5 = 100 m.