Illumination What will be the number of lamps, each having 300 lumens, required to obtain an average illuminance of 50 lux on a 4m × 3m rectangular room? 4 2 5 6 4 2 5 6 ANSWER DOWNLOAD EXAMIANS APP
Illumination A 1000 W bulb fitted with a reflector illuminates an area of 3 m x 3 m with an average illumination of 450 lux. If the bulb has and efficiency of 9 lumens / watt the efficiency of the reflector is 20 %. 70 %. 45 %. 30 %. 20 %. 70 %. 45 %. 30 %. ANSWER DOWNLOAD EXAMIANS APP
Illumination Which lamp is best suited for lighting an International sports arena? Incandescent Compact Fluorescent LED Metal Halide Incandescent Compact Fluorescent LED Metal Halide ANSWER DOWNLOAD EXAMIANS APP
Illumination Which lamps can be directly connected to a solar cell? LED Metal Halide Incandescent Compact Fluorescent LED Metal Halide Incandescent Compact Fluorescent ANSWER DOWNLOAD EXAMIANS APP
Illumination Which cells in the eye are responsible for scotopic vision? Both ‘a’ and ‘b’ Cone cells None of these Rod cells Both ‘a’ and ‘b’ Cone cells None of these Rod cells ANSWER DOWNLOAD EXAMIANS APP
Illumination The illumination of the surface varies directly with cosine of the angle between normal to surface and direction of the inclined light is given by Lambert’s cosine law. None of these both A and B. law of square inverse. Lambert’s cosine law. None of these both A and B. law of square inverse. ANSWER DOWNLOAD EXAMIANS APP
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