ILLUMINATION QUIZ

Which among the following lamps has the maximum burning hours?

Metal halide.

Compact Fluorescent.

Incandescent.

LED.

TRUE ANSWER : ?
YOUR ANSWER : ?

Which cells in the eye are responsible for scotopic vision?

None of these

Both ‘a’ and ‘b’

Cone cells

Rod cells

TRUE ANSWER : ?
YOUR ANSWER : ?

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

Lambert’s cosine law.

law of square inverse.

both A and B.

None of these

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

17.5 lux.

12.5 lux.

18.5 lux.

13.5 lux.

TRUE ANSWER : ?
YOUR ANSWER : ?

Which lamps can be directly connected to a solar cell?

LED

Metal Halide

Compact Fluorescent

Incandescent

TRUE ANSWER : ?
YOUR ANSWER : ?

Unit of luminous flux is

steradians.

lumens.

candela.

lux.

TRUE ANSWER : ?
YOUR ANSWER : ?

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

Both ‘a’ and ‘b’

To convert DC to AC

None of these

To convert AC to DC

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?

6

5

2

4

TRUE ANSWER : ?
YOUR ANSWER : ?

Solid angle is expressed in terms of

radians.

steredians.

radians / meter.

degree.

TRUE ANSWER : ?
YOUR ANSWER : ?

Candela is the unit of which?

Frequency.

Luminous intensity.

Wavelength.

Luminous flux.

TRUE ANSWER : ?
YOUR ANSWER : ?

↑