Twilight is the name given to the time ____, when the sky remains illuminated and allows outdoor activities without artificial lighting
a. after sunset and immediately before sunrise
b. after sunset and immediately after sunrise
c. before sunset and immediately before sunrise
d. before sunset and immediately after sunrise
e. around sunset
ANSWER: a
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An influx of foreign workers into the United Arab Emirates has had what demographic impact?
A) a rise in birth rates B) a rise in the elderly population C) a rise in birth rates and an extraordinary gender imbalance with far more females than males D) a decrease in birth rates E) it has created an extraordinary gender imbalance with far more males than females
Coal replaced wood as industrialized countries' major energy source in the nineteenth century because
A. Wood is not as energy efficient as coal B. Wood supplies were diminishing C. Coal was easier to transport D. Coal was a cleaner fuel E. Early conservationists warned about the loss of biodiversity in the forests
Water molecules stick to each other due to what weak form of chemical bond?
Covalent Bond Hydrogen Bond Ionic Bond
A bungee jumper attains a speed of 30 m/s just as the bungee cord begins to stretch. If the period of stretch is 2 s, the magnitude of the jumper's average deceleration is about
A) 0.5g. B) g. C) 1.5g. D) 2g. E) none of the above