CG Board Class 6 Science Light Textbook question and answers as well as extra question and answers from the chapter.
Choose the correct option-
I. Time taken by light to travel from the Sun to the Earth is
(a) 5 minutes (b) 6 minutes (c) 7 minutes (d) 8 minutes
(d) 8 minutes
II. When moon passes through the middle of the umbra of the earth then
(a) Total lunar eclipse occurs (b) Partial lunar eclipse occurs
(c) Solar eclipse occurs (d) None of these
(a) Total lunar eclipse occurs
III. When the sun is at the top of the head, then the length of the shadow of a man will be –
(a) Maximum (b) Minimum (c) Twice the height of man (d) None of these
(b) Minimum
Fill in the blanks –
1. An object, which has its own light, is called ____________.[light source.]
2. Light travels in a ______________ line.[straight ]
3. Eclipses of the Moon and the Sun occur due to the shadows cast by the Earth and
_________________ respectively.[Moon]
4. Change in direction of light rays by a shiny surface is known as ———– of light.[Reflection]
Short answer questions:
Name any four light sources.
Incandescent light bulbs, fluorescent lamps, LED lights, and the Sun are four examples of light sources.
How does light travel from one point to the other?
Light travels in straight lines from one point to another. It can travel through various mediums such as air, water, and transparent materials.
Explain the following using ray diagrams:
(i) Lunar Eclipse:
In a lunar eclipse, the Earth comes between the Sun and the Moon. The ray diagram would show the Earth casting a shadow on the Moon. The central, darker part of the shadow is the umbra, and the outer, lighter part is the penumbra. When the Moon enters the umbra, a total lunar eclipse occurs, and when it passes through the penumbra, a partial lunar eclipse occurs.
(ii) Solar Eclipse:
In a solar eclipse, the Moon comes between the Earth and the Sun. The ray diagram would show the Moon casting a shadow on the Earth. Similar to a lunar eclipse, there is an umbra and penumbra. A total solar eclipse occurs in the region under the Moon’s umbra, where the sunlight is completely blocked. In the region under the penumbra, a partial solar eclipse occurs, where only a part of the Sun is obscured.
Additional Question and Answers
When are we able to see an object?
We are able to see an object when light scattered from that object enters our eyes.
