Job candidates have been warned by watchdog Which? that there are certain questions they can choose not to answer.
According to the body, questions that centre on marital status and sexuality, political allegiance or religious views are illegal and employers should not be asking them.
Although they would have been asked commonly in years past, personal questions such as these mean bosses could face fines for breaking discrimination laws, the organisation stated.
Sue Tumelty of Which? noted that interview questions should be investigating the candidate's ability to do the job.
Employers have "no business" asking unlawful questions, she said.
"It helps to be aware of what you can and cannot be asked, so that you can feel confident in - politely - declining to answer any questions that make you uncomfortable," she advised.
A recent survey by jobs.ac.uk revealed that environmental issues can influence a jobseeker's decision to apply for a particular company.
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