CBSE Class 7  >  Class 7 Notes  >  Science (Curiosity) - New NCERT  >  Visual Worksheet: Sources Light

CBSE Class 7 Science Chapter 11 Sources Light Worksheet - Free Download

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FAQs on Visual Worksheet: Sources Light

1. What are the different sources of light?
Ans. Sources of light include natural sources like the sun, stars, and fire, as well as artificial sources like light bulbs and LEDs.
2. How is light produced in incandescent light bulbs?
Ans. Incandescent light bulbs produce light by heating a filament inside the bulb until it glows hot enough to emit visible light.
3. What is the difference between luminescence and incandescence?
Ans. Luminescence is the emission of light without heat, while incandescence is the emission of light due to heat.
4. Can sound be considered a source of light?
Ans. No, sound is a form of energy that travels through vibrations in matter, while light is a form of electromagnetic radiation that can be seen.
5. How do LED lights differ from traditional light sources in terms of energy efficiency?
Ans. LED lights are more energy-efficient than traditional light sources like incandescent bulbs because they convert more energy into light rather than heat.
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