Photo & Thermo-Electricity MCQs 8 min Score: 0 Attempted: 0/8 Subscribe 1. When ultraviolet light falls on a _______ surface, electrons are emitted. (A) ceramic (B) non-metal (C) wooden (D) metal 2. Emission of electrons due to effect of light is called as _______ emission. (A) thermionic (B) secondary (C) electric (D) photoelectric 3. Photoconductive materials offer _____ resistance in the absence of light. (A) low (B) high (C) very low (D) none of these 4. In photo-sensitive material the amount of produced voltage depends on _______. (A) intensity of light (B) size of semiconductor (C) nature of semiconductor (D) All of these 5. Thermocouple is used for measuring _______. (A) temperature (B) resistance (C) velocity (D) flow 6. Thomas A. Edison invented incandescent lamp in _______. (A) 1879 (B) 1897 (C) 1987 (D) 1978 7. _______ filament is used in incandescent lamp. (A) carbon (B) copper (C) tungsten (D) silver 8. Fluorescent tube operates on _______ working temperature. (A) 300℃ (B) 400℃ (C) 500℃ (D) 600℃
