S1: Machines have parts made of iron. P: They must be painted or chrome plated. Q: Some parts rub against each other. R: Iron gets rusted. S: They must be lubricated with oil or grease. S6: When the machine is not in use, it should be covered. The Proper sequence should be: A. PRQS B. QRPS C. QSRP D. RPQS

[amp_mcq option1=”PRQS” option2=”QRPS” option3=”QSRP” option4=”RPQS” correct=”option4″]

The correct answer is: D. RPQS

Here is a brief explanation of each option:

• A. PRQS

This option is incorrect because it does not follow the correct order of events. Iron does not get rusted before it is painted or chrome plated.

• B. QRPS

This option is incorrect because it does not follow the correct order of events. Some parts do not rub against each other before they are lubricated with oil or grease.

• C. QSRP

This option is incorrect because it does not follow the correct order of events. Iron does not get rusted before it rubs against other parts.

• D. RPQS

This option is the correct answer because it follows the correct order of events. Iron must be painted or chrome plated to prevent it from rusting. Some parts must be lubricated with oil or grease to reduce friction and prevent them from rubbing against each other. When the machine is not in use, it should be covered to protect it from dust and other contaminants.

I hope this helps! Let me know if you have any other questions.