No question in any form of application or in any test may be so framed as to elicit any information concerning the political or religious opinions or affiliations of any applicant, nor may any inquiry be made concerning such opinions or affiliations. All disclosures thereof must be discountenanced. No discrimination may be exercised, threatened, or promised by any person in the employ of any division of the service or of the personnel division against or in favor of any applicant, eligible, or employee because of sex, race, color, national origin, age, or religious or political opinions or affiliations.