Step 1: Understanding the Concept:
Intelligence tests can be classified based on the nature of the items used and the medium of expression required.
Step 2: Detailed Explanation:
Verbal Tests:
1. These tests require subjects to give oral or written responses.
2. The items are presented in a specific language (e.g., English, Hindi).
3. These tests can only be administered to literate individuals who are proficient in the language used in the test.
4. Example: Vocabulary tests, general information tests.
Non-Verbal Tests:
1. These tests use pictures, illustrations, or geometric symbols as items.
2. They do not require the use of language to solve the problems; instructions may be given through gestures or simple language.
3. These tests reduce cultural and linguistic bias and can be administered to illiterates, children, and people from different cultural backgrounds.
4. Example: Raven’s Progressive Matrices (RPM).
Step 3: Final Answer:
The main difference is that verbal tests rely on linguistic ability and literacy, while non-verbal tests rely on visual-spatial reasoning and are language-independent.