Light and Illuminance Quiz

What is the unit of luminous intensity?

• Candela (cd)

• Lumen (lm)

• Watt (W)

• Lux (lx)

What is the unit of illuminance?

• Watt (W)

• Candela (cd)

• Lumen (lm)

• Lux (lx)

What is the range of illuminance for emergency lighting?

• 5000 lux

• 1000 lux

• 0.2 lux

• 10000 lux

What is the measur of the ability of a lump to convert electrical energy into light energy?

• Luminous flux

• Efficacy

• Illuminance

• Luminous intensity

A source of light has a luminous flux of 3500 lm. The worktop on which the light falls is 1.5 m x 3.5 m. What is the illuminance?

• 337 lux

• 447 lux

• 557 lux

• 667 lux

A source of light has a luminous flux of 2,000 lm. The worktop on which the light falls is 3 m x 3 m. What is the illuminance?

• 200 lux

• 111 lux

• 222 lux

• 333 lux