Question

In which implement, bullocks are not used for lifting water?
A. Baldev Balti
B. Charsa
C. Egyptian screw
D. Rahat (Persian wheel)

Answer 1

Hint: An instrument that was created by Archimedes is used to transfer water to irrigation ditches. The water is taken from low-lying water bodies and transferred to the ditches through a pipe-like structure that is dipped from one end into the water. Other than water, this implement is also used for transferring powders and grains.

Complete answer:
In Egyptian screws, bullocks are not used for lifting water.
An Egyptian screw is a device that was invented by Archimedes. Due to this, it is also known as Archimedes screw. Even though it was invented by Archimedes, records show that this device was already being used in Egypt even before the 3rd century B.C.

It consists of a large cylindrical tube within which a helix or screw-like structure is present. It is dipped into the water body from one end at an angle of 45 degrees. When the device is rotated, water gets pulled inside the structure. In some other forms, the tube is stationary while the helix is moved to pull the water in. The water is then either collected or allowed to directly irrigate the crops.

The screw or helix can be turned either manually or by a windmill. The modern Egyptian screw uses a motor to turn the screw.

Hence, the correct answer is option (C).

Note: The Egyptian screws are predominantly used for irrigation of crops, dewatering mines, and draining water from low lands. This implementation works well even with fluid mixed with solid substances, and due to this, it is even used in sewage treatment plants. A different variety of this instrument is used in fish hatcheries, where the fish are transported from one pond into another.