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Photo & Thermo-Electricity MCQs

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1. When ultraviolet light falls on a _______ surface, electrons are emitted.





2. Emission of electrons due to effect of light is called as _______ emission.





3. Photoconductive materials offer _____ resistance in the absence of light.





4. In photo-sensitive material the amount of produced voltage depends on _______.





5. Thermocouple is used for measuring _______.





6. Thomas A. Edison invented incandescent lamp in _______.





7. _______ filament is used in incandescent lamp.





8. Fluorescent tube operates on _______ working temperature.





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