A person's mental age is a measurement of their ability to think when compared to the average person's ability at that age.

The successful candidate who passed through various stage of selection process will be called for final interview.

(i) Reference check is done to know reliability and trustworthiness of the candidates.
(ii) The selector decides the selection worthiness of the candidate based on the reference and recommendation given by referees.

Due to tremendous growth in information and communication technology, these days interviews are conducted by means of internet via Skype, Wechat, Google duo, Tiber, "hatsapp or 'ideo chat applications.

Judgement test is conducted to test the presence of mind and reasoning capacity of the candidates.

David & Robbins, "Selection is a managerial decision making process is to predict which job applications will be successful if hired.

(i) Placement is a process of assigning a specific job to each and every candidate selected.
(ii) Placement signifies placing the rights person on the right job in a good manner.
(iii) The term placement includes initial assignment of new employees and promotion, transfer or demotion of precent employees.

Bio data refers to the details of the applicants applied for the job. It includes the information like, Qualification, age, experience, skills, information about previous worked place, etc.

Interview represents a face to face interaction between the interviewer and the interviewee. An interview is a purposeful exchange of ideas, the answering of questions and communication between two or more persons

(i) Selection is the process of differentiating between applicants in order to identify and hire those with a greater likelihood of success in a job.
(ii) Selection is the process of choosing the most suitable person for the vacant position in the organisation.