Illumination Unit of luminous flux is lux. steradians. lumens. candela. lux. steradians. lumens. candela. ANSWER DOWNLOAD EXAMIANS APP
Illumination The solid angle subtended by an area of 2400 cm2 on the surface of a sphere of diameter 1.2 m is 1 / 3. 3 / 2. 2 / 3. 2 / 5. 1 / 3. 3 / 2. 2 / 3. 2 / 5. ANSWER DOWNLOAD EXAMIANS APP
Illumination What is the ratio of illuminance at a point 5m just below a lamp emitting 100 candelas and at a point 5m away from the first point on the same horizontal plane? 1: 2√2 2:1 1:2 2√2 : 1 1: 2√2 2:1 1:2 2√2 : 1 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 law of square inverse. None of these both A and B. Lambert’s cosine law. law of square inverse. None of these both A and B. Lambert’s cosine law. ANSWER DOWNLOAD EXAMIANS APP
Illumination Candela/metre square is the unit of which photometric quantity? Luminous flux Luminous Intensity Luminance Illuminance Luminous flux Luminous Intensity Luminance Illuminance 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 70 %. 30 %. 45 %. 20 %. 70 %. 30 %. 45 %. 20 %. ANSWER DOWNLOAD EXAMIANS APP
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