Grade 10 Adv Chapter 1 Fundamentals of Light

Multiple Choice

What is the illumination on your desktop if it is lit  by a 1.75 X 10³-lm lamp that is 2.50 m above your  desk?

• 20 lx

• 22.3 lx

• 25 lx

• 26 lx

Multiple Choice

A living room ceiling is 3 meters high. There are six recessed lights on the ceiling, each of which has a luminous flux of 4.3 X 10³ lm. The total illuminance of the light on the living room floor from all recessed lights, to the closest integer is. 

• 223 lx

• 200 lx

• 250 lx

• 300 lx

Multiple Choice

The unit of luminous flux.

• Lumen

• lux

• candela

• meter

Multiple Choice

The unit of luminous intensity.

• meter

• candela

• lux

• lumen

Multiple Choice

The unit of illuminance.

• candela

• lumen

• meter

• lux

Multiple Choice

The amount of light emitted from the source in all directions is ------------

• Luminous intensity

• Luminous flux

• illuminance

Multiple Choice

The amount of light falling from an area of 1 m2 from one meter distance is known as ---------------.

• illuminance

• luminous flux

• luminous Intensity

Multiple Choice

The amount of light falls on a surface from a distance r is known as -----------------------.

• illuminances

• luminous intensity

• luminous flux