Which of the following cannot induce a voltage in a loop of wire?
A. Changing the current in a nearby loop
B. Moving the loop near a magnet
C. Moving a magnet near the loop
D. Expanding or contracting the loop in a region where there is no magnetic field
Answer: D
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Which of the following protogalactic clouds is most likely to form a spiral galaxy?
A) a very low-density cloud with very little angular momentum B) a dense cloud with very little angular momentum C) a low-density cloud with quite a bit of angular momentum D) a very massive cloud with any density and a lot of angular momentum
Greenland and Antarctica are covered with glacial ice sheets called
a. valley glaciers. b. mountain glaciers. c. continental glaciers. d. none of the above.
Compared to the density of water, our Earth averages about
A) the same density, similar to Saturn. B) 3 times denser, much like our Moon. C) 4 times denser, similar to Mars. D) 5 times denser, like the Mercury and Venus. E) 10 times denser, due to our core of iron and nickel.
What was the last geological period in Earth's history during which the dinosaurs lived?
A) The Cretaceous Period B) The Tertiary Period C) The Triassic Period D) The Carboniferous Period