Improving language competencies involves developing skills in reading, writing, listening, and speaking.
- Competitive exams: Primarily for assessment, not a direct tool for effective utilization by a teacher to improve competencies on a daily basis, though they can motivate.
- Laboratory: Typically associated with science subjects for experiments, not directly for language competency development, unless it's a language lab (which is a specialized form of resource).
- Play ground: Important for physical development and social skills, can offer informal language use, but not a structured resource a teacher "utilizes effectively" for targeted language competency improvement.
- Library: A library is a rich resource of books, magazines, and other reading materials.
Effective utilization of a library by a teacher involves encouraging reading habits, providing access to diverse texts, storytelling sessions, book discussions, etc.
These activities directly contribute to vocabulary building, comprehension, an understanding of grammar and sentence structure, and fostering a love for language.
Therefore, a library is the most suitable resource among the options for a teacher to utilize effectively to improve language competencies of children.