Which of the following are non-projected aids? A. Epidiascope B. Audio…
2024
Which of the following are non-projected aids?
A. Epidiascope
B. Audio Cassettes
C. Filmstrip and slides
D. Models
E. Plastigraph
Choose the correct answer from the options given below:
Answer: D. B, D and E only — Concept Teaching aids are grouped by the way they place material in front of the learner. A projected aid depends on an optical projector — a lamp, a lens and…
- A.
A and C only
- B.
B, C and E only
- C.
A, C and D only
- D.
B, D and E only
Show answer & explanation
Correct answer: D
Concept
Teaching aids are grouped by the way they place material in front of the learner. A projected aid depends on an optical projector — a lamp, a lens and a screen — to throw an enlarged image, so it needs a power supply, a screen and usually a darkened room. A non-projected aid carries no such optical projection: it is displayed, handled or heard directly, and it works in an ordinary lit classroom without any projector.
Applying the test to the five aids listed
Aid | How it places material before the learner | Optical projector needed? |
|---|---|---|
Epidiascope | A lamp, mirror and lens throw an enlarged image of an opaque page or a transparency onto a screen. | Yes |
Audio Cassettes | Magnetic tape is played back through a recorder and the material reaches the learner as sound. | No |
Filmstrip and slides | Photographic frames are illuminated and enlarged onto a screen, one frame at a time. | Yes |
Models | Three-dimensional scale replicas of an object are examined and handled directly in the classroom. | No |
Plastigraph | Cut-out figures are placed and rearranged by hand on a PVC display board. | No |
Cross-check
Only the epidiascope and filmstrip-and-slides pass an image through a lens onto a screen, so those two belong to the projected family. The other three — audio cassettes, models and the plastigraph — present their material without any optical projection, which is the group listed as B, D and E in the stem.
Note on the audio channel: in the standard audio-visual classification the projected versus non-projected split turns on whether a projector is required to display the aid. An audio aid such as a cassette requires none, so it is counted with the non-projected aids rather than with the projected ones.