What is the efficiency of a machine that puts out 100 W of power for every 1000 W put into it?
A. 10%.
B. 110%.
C. 50%.
D. 90%.
Answer: A
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Doppler shifting indicates that our universe is
A. in decay. B. expanding. C. in rapid motion. D. none of the above
Judge the following sentence according to the criteria given below: Aluminum is concentrated in the
formation of bauxite ore BECAUSE it is relatively insoluble during the deep chemical weathering that occurs in hot, humid tropical climates. a. The assertion and reason are both correct, and the reason is valid. b. The assertion and reason are both correct, and the reason is invalid. c. The assertion is correct and the reason is incorrect. d. The assertion is incorrect and the reason is correct. e. Both the assertion and the reason are incorrect
The San Andreas Fault marks a ____.?
a. ?convergent boundary b. ?divergent boundary c. ?subduction zone d. ?continental collision zone e. ?transform boundary
Although Europe is half the size of the contiguous United States, it has a larger population
a. True b. False Indicate whether the statement is true or false