ILLUMINATION QUIZ

Which cells in the eye are responsible for scotopic vision?

Cone cells

Rod cells

None of these

Both ‘a’ and ‘b’

TRUE ANSWER : ?
YOUR ANSWER : ?

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

Compact Fluorescent

Metal Halide

Incandescent

LED

TRUE ANSWER : ?
YOUR ANSWER : ?

What is the work of a driver in case of an LED?

Both ‘a’ and ‘b’

To convert AC to DC

To convert DC to AC

None of these

TRUE ANSWER : ?
YOUR ANSWER : ?

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

Luminous Intensity

Luminous flux

Luminance

Illuminance

TRUE ANSWER : ?
YOUR ANSWER : ?

Solid angle is expressed in terms of

radians / meter.

steredians.

radians.

degree.

TRUE ANSWER : ?
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?

2

4

5

6

TRUE ANSWER : ?
YOUR ANSWER : ?

Unit of luminous flux is

candela.

steradians.

lumens.

lux.

TRUE ANSWER : ?
YOUR ANSWER : ?

Luminous efficacy of a typical HPSV lamp is in between

10 - 40 lm/watt

120 - 200 lm/watt.

40 - 70 lm/watt.

70 - 120 lm/watt.

TRUE ANSWER : ?
YOUR ANSWER : ?

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 / 5.

2 / 3.

TRUE ANSWER : ?
YOUR ANSWER : ?

Which among the following lamps has the maximum burning hours?

Compact Fluorescent.

Metal halide.

LED.

Incandescent.

TRUE ANSWER : ?
YOUR ANSWER : ?

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