Saved Bookmarks
| 1. |
A cylindrical drum, open at the top, contains 30 litres of water. It drains out through a small opening at the bottom. 10 litres of water comes out in time t1, the next 10 litres in a further time t2 and the last 10 litres in a further time t3. Then, (a) t1 = t2 = t3 (b) t1 > t2 > t3 (c) t1 < t2 < t3 (d) t2 > t1 = t3 |
|
Answer» Correct Answer is: (c) t1 < t2 < t3 Velocity of efflux, v = √2gx, where x = height of liquid. As the water drains out, x reduces, and hence v reduces. This reduces the rate of drainage. Hence, it requires a longer time to drain the same volume of water. |
|