Final answer:
The statement is false as agencies can use multiple assessment instruments; the personality assessment using true/false questions is the Minnesota Multiphasic Personality Inventory (MMPI).
Step-by-step explanation:
The statement "Agencies are prohibited from using more than one type of assessment instrument in evaluating a group of applicants for a position" is false. Agencies often use a combination of various assessment tools to get a comprehensive understanding of an applicant's qualifications and personality. Specifically answering the question, the personality assessment that employs a series of true/false questions is the Minnesota Multiphasic Personality Inventory (MMPI). This assessment is widely used across various fields, including clinical psychology, occupational health, and even within legal instances where psychological assessment is required.