Composing about 78 percent of the air at sea level, what is the most common gas in the Earth's atmosphere?
a) Oxygen
b) Nitrogen
c) Carbon dioxide
b) Nitrogen
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15
Which solar system planets have rings?
a) Saturn, Jupiter, Neptunus and Uranus
b) Saturn, Jupiter and Neptunus
c) Saturn and Jupiter
a) Saturn, Jupiter, Neptunus and Uranus
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15
What vitamin is produced when a person is exposed to sunlight?
a) B12
b) E
c) D
c) D
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15
How many pairs of chromosomes are in found in the average human?
a) 20
b) 22
c) 23
c) 23
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15
Who invented the aeroplane ?
a) James Watt
b) Amelia Earhart
c) Wright brothers
c) Wright brothers
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15
Which of these people developed the polio vaccine?
a) Marie Curie
b) Isaac Newton
c) Jonas Salk
c) Jonas Salk
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15
Which is the most abundant metal in the earth's crust?
a) Iron
b) Aluminum
c) Nickel
b) Aluminum
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15
Zero degrees Celsius is equal to what reading on the Fahrenheit scale?
a) 32
b) 26
c) 41
a) 32
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15
Who developed and patented the electrical telegraph in the United States in 1837?
a) Samuel Morse
b) Alexander Graham Bell
c) Thomas Alva Edison
a) Samuel Morse
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15
This picture shows three layers of the Earth. Which layer is the hottest?
a) The outer layer, called the Earthโs crust
b) The middle layer, called the Earthโs mantle
c) The inner layer, called the Earthโs core
c) The inner layer, called the Earthโs core
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15
A common name for mercury is
a) Quicksilver
b) Freddy
c) Hydrargyrum
a) Quicksilver
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15
In humans, the atlas and axis bones are found in which part of the body?
a) legs
b) neck
c) abdomen