In many jurisdictions, including Australia, certain questions on job applications can be deemed illegal under discrimination and privacy laws. Employers are prohibited from asking about a candidate’s age, sexual orientation, religion, marital status, disability, or other personal attributes that are irrelevant to their ability to perform the job. The purpose of these laws is to promote fairness and prevent discrimination.

However, the legality can depend on the specific context of the job and the nature of the question. Some questions may be allowed if they are relevant to the requirements of the position or if they pertain to occupational health and safety considerations, like asking if someone has certain medical conditions for a physically demanding job.

If a job applicant feels that a question is inappropriate or potentially illegal, they have the right to seek clarification or even report the issue to relevant governing bodies, such as the Fair Work Ombudsman or anti-discrimination agencies. Always consult local regulations or seek legal advice if in doubt about specific inquiries on job applications.