Question

Rajesh is a welder who was working at Mohan’s house. After making a ‘railing’ using electric welding with naked eyes, Rajesh was using a grinder on it to smoothen the welding joints. Just then some particles fell into Rajesh’s eye. He started crying with pain. Mohan hired an auto and took him to an eye hospital. In the hospital, the doctor used a device connected to two electric wires to remove the particle from Rajesh’s eye. Rajesh asked Mohan what had fallen into his eye and what device was used by the doctor to remove that particle from the eye. Being a science student of Class X, Mohan explained everything to Rajesh and asked him to be careful in future.

1. What could be the particle which fell into Rajesh’s eye?
2. What device was used by the doctor to remove the particle and how it worked?
3. What precautions should be observed by Rajesh while doing electric welding and grinding work?
4. What values are shown by Mohan during this episode?

Answer 1

1. The particle which fell into Rajesh’s eye could be a tiny piece or filing of iron (or steel) produced during the grinding of the iron railing joints.
2. The device used by the doctor was an electromagnet. It worked by creating a temporary magnetic field when electric current passed through its coils, which magnetically attracted and safely pulled out the magnetic iron particle from Rajesh’s eye.
3. Rajesh should observe the following precautions:
   • He must wear a welding face shield or safety goggles with a dark filter to protect his eyes from the intense, harmful ultraviolet light during welding.
   • He must wear clear safety glasses during grinding work to prevent flying metal sparks and particles from entering his eyes.
4. Mohan showed values of empathy, helpfulness, quick decision-making, responsibility toward a worker in distress, and the ability to apply his scientific knowledge to real-life situations.