Explanation:

- The Factories Act, 1948 requires the owner to constitute a Safety Committee in certain cases.

- Option 1 (1000 or more workers): Not correct, as the threshold is different.

- Option 2 (Hazardous substances are used or handled): As per Section 41G, factories where hazardous substances are handled must have a Safety Committee.

- Option 3 (Heavy machinery is utilized): Not specified by the Act for forming a Safety Committee.

- Option 4 (500 or more workers are employed): This is also correct—the rules in many states require Safety Committees in factories with 500 or more workers, even if not handling hazardous substances.

Correct Answers:

- Option 2

- Option 4