Match the LIST-I with LIST-II LIST-I LIST-II A. Teaching Aids I. Online…

Concept: A teaching aid is any supplementary material or device a teacher brings into the classroom to make abstract content concrete, and the defining purpose of the whole category is to arouse and hold learner attention so that teaching and learning become interesting and effective. Aids are then sorted by a single test — whether a light source and a screen are needed to display them: a projective (projected) aid needs a lamp, a lens system and a screen, while a non-projective (non-projected) aid is used directly before the class with no projection at all. Separate from that classification is the mode of delivery: instruction carried to a large, open audience over the internet is online education.

Application: apply the purpose test and the projection test to each entry of LIST-I.

1. Teaching Aids is the category name itself, so it is described by the category's function — supplying concrete experience that keeps attention alive and makes teaching-learning interesting. It therefore pairs with III.

2. Chalk-board is written on directly with chalk; no lamp, lens or screen is involved, so it falls in the non-projected class. It therefore pairs with II.

3. Overhead Projector uses a lamp and a condenser-lens system to throw the image of a transparency onto a screen, which is exactly the projection test. It therefore pairs with IV.

4. MOOCs (Massive Open Online Courses, such as those on SWAYAM and NPTEL) deliver a complete course over the internet to an unrestricted number of learners, which is online education. It therefore pairs with I.

Cross-check: the same test applied across the three families keeps every pairing distinct.

Result: A → III, B → II, C → IV, D → I.