ILLUMINATION QUIZ

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

18.5 lux.

17.5 lux.

12.5 lux.

13.5 lux.

TRUE ANSWER : ?
YOUR ANSWER : ?

The range of visual spectrum is

480nm - 1000nm.

480nm - 760nm.

300nm - 760nm.

300nm - 1000nm.

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YOUR ANSWER : ?

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?

6

2

4

5

TRUE ANSWER : ?
YOUR ANSWER : ?

Candela/metre square is the unit of which photometric quantity?

Luminance

Luminous Intensity

Luminous flux

Illuminance

TRUE ANSWER : ?
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Which lamp has a negative Colour Rendering Index (CRI)?

High pressure sodium vapour

LED

Fluorescent

Low pressure sodium vapour

TRUE ANSWER : ?
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The solid angle subtended by an area of 2400 cm2 on the surface of a sphere of diameter 1.2 m is

3 / 2.

2 / 3.

1 / 3.

2 / 5.

TRUE ANSWER : ?
YOUR ANSWER : ?

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?

2√2 : 1

2:1

1:2

1: 2√2

TRUE ANSWER : ?
YOUR ANSWER : ?

Candela is the unit of which?

Wavelength.

Luminous intensity.

Frequency.

Luminous flux.

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Luminous efficiency of a fluorescence lamp is

60 lumens / watt.

70 lumens / watt.

40 lumens / watt.

30 lumens / watt.

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Which lamp is best suited for lighting an International sports arena?

LED

Compact Fluorescent

Incandescent

Metal Halide

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