answer the following questions. (Any Ten)
1. Define reproduction,
2. What are the sources of light?
3. Define the following terms.
1) Translucent ii) Transparent
4. What is light year?
in) Opaque
5. Define solar eclipse,
6. Define lunar eclipse.
7. Differentiate between image and shadow
8. Which is greater -- 46mm or 5.0cm?
9. What is cyclone?
10. Give one reason for water shortage in some places in India.
11. What is oscillatory motion?
Answer the following in details (Amy Four)
Differentiate between solar eclipse and lunar eclipse.
ht with an experiment,
Answers
the act or process of reproducing specifically : the process by which plants and animals give rise to offspring and which fundamentally consists of the segregation of a portion of the parental body by a sexual or an asexual process and its subsequent growth and differentiation into a new individual.
A light source is anything that makes light. There are natural and artificial light sources. A few examples of natural light sources include the Sun, stars and candles. A few examples of artificial light sources include light bulbs, lamp posts and televisions.
Translucent is an adjective. It means “less than completely transparent, but clear enough to allow the passage of light.” Imagine a sheet of frosted glass.
When you're transparent, you invite trust by revealing that you have nothing to hide. You establish yourself as an honest, credible person in the eyes of others. The prospect of being open and vulnerable may make you nervous, but the digital revolution has made transparency a matter of survival.
A light-year is a measurement of distance and not time (as the name might suggest). A light-year is the distance a beam of light travels in a single Earth year, or 6 trillion miles (9.7 trillion kilometers). On the scale of the universe, measuring distances in miles or kilometers doesn cut it.
A solar eclipse occurs when a portion of the Earth is engulfed in a shadow cast by the Moon which fully or partially blocks sunlight. This occurs when the Sun, Moon and Earth are aligned. Such alignment coincides with a new moon (syzygy) indicating the Moon is closest to the ecliptic plane.
Lunar eclipses occur when Earth's shadow blocks the sun's light, which otherwise reflects off the moon. There are three types — total, partial and penumbral — with the most dramatic being a total lunar eclipse, in which Earth's shadow completely covers the moon.
A dark patch formed on a surface behind an opaque object placed in the path of light is called a shadow.
...
Image Shadow
Image is seen when light comes from the object after reflection or refraction enters the observer's eye. No light enters the eye from the shadow of the object.
In addition to the difference in the basic units, the metric system is based on 10s, and different measures for length include kilometer, meter, decimeter, centimeter, and millimeter. ... This means that a meter is 100 times larger than a centimeter, and a kilogram is 1,000 times heavier than a gram.