1 . When sunlight passes through tiny suspended rain drops it produces—
- A. Rainbow
- B. White light
- C. Ultraviolet ray
- D. None
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2 . Rainbows are often seen when the sun comes out after or during a rainstorm. Rainbows are caused when sunlight shines through drops of water in the sky at specific angles. When white sunlight enters a raindrop, it exits the raindrop a different color. When light exits lots of different raindrops at different angles, it produces the red, orange, yellow, green, blue, indigo, and violet that you see in a rainbow. Together, these colors are known as the spectrum. These colors can sometimes be seen in waterfalls and fountains as well. Do you know that there are double rainbows? In a double rainbow light reflects twice inside water droplets and forms two ar4ce. In those in the bottom are. In other words, the order of colors with purple on top and ends with the red on the bottom. In addition. rainbows sometimes appear as white arcs at night. These rainbows are called moonbows and are so rare that very few people with ever seen me. Moonbows are caused by moonlight (rather than sunlight ) shining through drops of water. 1.Rainbows are often seen ______ .
- A. after a rainstorm
- B. after the sun sets at night
- C. when it snows
- D. before a rainstorm
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3 . Engineers are still typing to successfully ___ the power of sunlight for effecient production of electrycity.
- A. harness
- B. control
- C. generate
- D. regulate
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4 . Often visible as smog , ozone is formed in the atmosphere form" hydrocarbons and nitrogen oxides , two major pollutants emitted by automobiles react with sunlight .
- A. ozone is formed in the atmosphere from
- B. ozone is formed in the atmosphere when
- C. ozone is formed in the atmosphere when
- D. ozone is formed in the atmosphere ,and when
- D. None of them
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5 . Sunlight : photosynthesis :: Oxygen :?
- A. heart beat
- B. respirataion
- C. life
- D. blood vassel
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6 . Sunlight
- A. helps growth of bacterias
- B. impedes growth of algae
- C. increases dissolved oxygen content
- D. reduces turbidity.
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7 . Fungi do not absorb sunlight but use animals and plants ..... dead and living, as their source of food
- A. both
- B. besides
- C. together
- D. furthemore
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8 . Keep the plants ___ window so they get enough sunlight.
- A. infront
- B. beside
- C. near to
- D. in
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