Illumination Solid angle is expressed in terms of radians / meter. radians. steredians. degree. radians / meter. radians. steredians. degree. 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 45 %. 30 %. 70 %. 20 %. 45 %. 30 %. 70 %. 20 %. ANSWER DOWNLOAD EXAMIANS APP
Illumination Which cells in the eye are responsible for scotopic vision? None of these Both ‘a’ and ‘b’ Cone cells Rod cells None of these Both ‘a’ and ‘b’ Cone cells 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 law of square inverse. both A and B. None of these Lambert’s cosine law. law of square inverse. both A and B. None of these Lambert’s cosine law. ANSWER DOWNLOAD EXAMIANS APP
Illumination Which among the following lamps has the maximum burning hours? Compact Fluorescent. Metal halide. LED. Incandescent. Compact Fluorescent. Metal halide. LED. Incandescent. 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 1: 2√2 2:1 2√2 : 1 1:2 1: 2√2 2:1 2√2 : 1 ANSWER DOWNLOAD EXAMIANS APP