Discussion
Match List I with List II and select the correct answer using codes given below :
| List I | List II |
|---|---|
| (a) Electron microscope | (i) Electron gun |
| (b) Oscilloscope | (ii) Condensing magnetic lens |
| (c) Galvanometric recorder | (iii) Recording head |
| (d) Magnetic recorder | (iv) Drive motor |
Answer: D
The correct matching is a-ii, b-i, c-iv, d-iii.
- An electron microscope focuses its beam with a condensing magnetic lens (ii).
- An oscilloscope (cathode ray tube) produces its beam with an electron gun (i).
- A galvanometric strip-chart recorder uses a drive motor to move the chart paper at a fixed speed (iv).
- A magnetic recorder writes and reads the tape through a recording head (iii).
Both instruments in the first two rows have an electron gun and focusing, so the pairing turns on the part each is best known for: the electron microscope's distinctive element is its magnetic lens system. The codes giving the oscilloscope a recording head or a drive motor do not fit.
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