ILLUMINATION QUIZ

The illumination at a point 5 meters below a lamp in 6 lux. The candle power of the lamp is

200.

150.

140.

30

TRUE ANSWER : ?
YOUR ANSWER : ?

Which among the following lamps has the maximum burning hours?

LED.

Compact Fluorescent.

Metal halide.

Incandescent.

TRUE ANSWER : ?
YOUR ANSWER : ?

Luminous efficacy of a typical HPSV lamp is in between

40 - 70 lm/watt.

120 - 200 lm/watt.

70 - 120 lm/watt.

10 - 40 lm/watt

TRUE ANSWER : ?
YOUR ANSWER : ?

Which cells in the eye are responsible for scotopic vision?

Both ‘a’ and ‘b’

None of these

Rod cells

Cone cells

TRUE ANSWER : ?
YOUR ANSWER : ?

The range of visual spectrum is

300nm - 1000nm.

300nm - 760nm.

480nm - 760nm.

480nm - 1000nm.

TRUE ANSWER : ?
YOUR ANSWER : ?

Luminous efficiency of a fluorescence lamp is

30 lumens / watt.

70 lumens / watt.

60 lumens / watt.

40 lumens / watt.

TRUE ANSWER : ?
YOUR ANSWER : ?

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 %.

70 %.

20 %.

30 %.

TRUE ANSWER : ?
YOUR ANSWER : ?

The work of ballast in a fluorescent tube is to

None of these.

provide a kick start when voltage is induced.

both ‘a’ and ‘b’.

limit the flow of current.

TRUE ANSWER : ?
YOUR ANSWER : ?

A 200 candle power lamp is hung 4 m above the centre of circular area of 5 m diameter. The illumination at centre of the area is

12.5 lux.

18.5 lux.

17.5 lux.

13.5 lux.

TRUE ANSWER : ?
YOUR ANSWER : ?

Wave length for red colour is around

500 nm.

600 nm.

400 nm.

700 nm.

TRUE ANSWER : ?
YOUR ANSWER : ?

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