The video tutorial introduces the concept of light intensity, explaining its definition and how it is measured using units like lux and devices such as light meters. It discusses different types of light sources, both natural and manufactured, and compares them based on brightness and heat energy. The tutorial also provides a detailed guide on using a lux meter to measure light intensity, including selecting measurement ranges and interpreting readings. Standards for required lux levels in various working environments are also covered.

What is the unit used to measure light intensity?

• Candle

• Watt

• Lux

• Lumen

Which of the following is a natural light source?

• Candle

• Torch

• Sun

• Lamp

What is the relationship between brightness and heat energy from a light source?

• Brighter sources emit less heat

• Heat is directly proportional to brightness

• Heat and brightness are unrelated

• Brighter sources always emit more heat

How is light intensity defined?

• The amount of heat emitted by a source

• The rate of light energy delivered per unit area

• The size of the light source

• The color of the light emitted

What device is used to measure light intensity?

• Thermometer

• Barometer

• Voltmeter

• Lux Meter

What is the required lux level for regular office spaces?

• 320 lux

• 1000 lux

• 80 lux

• 500 lux

How should the lux meter sensor be positioned when measuring light?

• Horizontally

• Vertically

• Diagonally

• Upside down

What is the reading of 1 lux equivalent to?

• 1000 lumens per square meter

• 1 lumen per square meter

• 10 lumens per square meter

• 100 lumens per square meter

Which of the following areas require about 80 lux?

• Classrooms

• Storerooms

• Libraries

• Office spaces

What happens to the lux reading as you move the sensor closer to a light source?

• It increases

• It remains the same

• It fluctuates randomly

• It decreases