Final answer:
Conducting telephone surveys of all employees is the most appropriate method for Ujjwal to gather job analysis information from a large number of employees efficiently and effectively, while interviews and observation might not be practical for a large group.
Step-by-step explanation:
The most appropriate method for Ujjwal, a manager at an electronics company, to gather job analysis information from a large number of employees who perform similar work would be conducting telephone surveys of all employees. This approach enables Ujjwal to reach a wide audience quickly and efficiently, while also ensuring consistency in the questions asked and data collected. While interviewing individuals such as the HR manager or supervisors could offer deeper insights, it is less practical when dealing with a large number of employees. Observation could be helpful, but it is time-consuming and not feasible for gathering detailed information from many employees at once. Group interviews might provide a compromise between the depth of information and breadth of reach, though they may still be logistically challenging.