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| Q.91 | A tube light is a lamp that works on low pressure ______ discharge phenomenon and converts ultra-violate ray into visible ray with the help of phosphor coated inside a glass tube. | |
| Ans | 1. scandium iodide | |
| 2. metal halide | ||
| 3. mercury vapour | ||
| 4. sodium iodide |
Correct Ans Provided: 3
