The video tutorial explains the classification of objects into luminous and non-luminous based on their ability to emit light. Luminous objects, like fireflies and electric bulbs, emit their own light, while non-luminous objects, such as the moon and planets, do not emit light but reflect light from other sources like the sun. The tutorial provides examples and clarifies why celestial bodies, despite appearing bright, are considered non-luminous because they reflect sunlight.

What is the primary characteristic of a luminous object?

• It changes color in the dark.

• It absorbs light completely.

• It emits light of its own.

• It reflects light from other sources.

Which of the following is NOT a luminous object?

• Firefly

• Candle

• Moon

• Electric bulb

Which of these objects is considered non-luminous?

• Fire

• Sun

• Electric bulb

• Stone

Why do we see the moon shining at night?

• It absorbs light and re-emits it.

• It emits its own light.

• It reflects sunlight.

• It is a source of heat.

What is the reason planets like Venus appear bright in the sky?

• They have a high temperature.

• They are closer to Earth than the moon.

• They reflect the light of the sun.

• They emit their own light.

How do non-luminous objects become visible?

• By emitting their own light.

• By changing their color.

• By reflecting light from luminous sources.

• By absorbing all light.