PYQ NEET- Mechanical Properties Of Fluids

• 2019: A 100 m long train is moving with a velocity of 60 km/h. The time taken by the train to cross a man standing on the platform is:

(A) 10 seconds (B) 12 seconds (C) 15 seconds (D) 20 seconds

Answer:

(D)

Explanation:

Speed = 60 * 5/18 = 16.67 m/sec

Time taken = 100 * 3/50 = 6 seconds

• 2018: A boat which can travel at 10 km/h in still water crosses a river of width 1 km along the shortest path in 15 minutes. The velocity of the river water in km/h is:

2 2.5 3 4

Answer:

(C)

Explanation:

Speed downstream = 10 + v = 10 + 4