Which of the following statements about chain reactions is true?
A. The key requirement for a chain reaction is that more neutrons are produced than that are absorbed.
B. Three or more neutrons must be released to sustain a chain reaction.
C. Only uranium isotopes are capable of supporting a chain reaction.
D. A chain reaction will only take place when a critical mass of material has been assembled.
E. It is not possible to stop or control a chain reaction once it has been started.
Answer: A
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While driving along the highway at a constant speed of 60 km/h you apply the brakes until the car slows to 40 km/h. When you suddenly release the brakes, the car tends to
A. continue moving at 40 km/h. B. decrease in speed if no other forces act. C. momentarily regain its higher initial speed. D. need more information
Which of the following phase changes does not involve a liquid?
A) evaporation B) melting C) sublimation D) None, they all involve a liquid.
What is the predominant technique used to extract minerals?
A. surface mining B. underground mining C. aerial mining D. in-situ injection
Crinoids are examples of early plants. Indicate whether the statement is true or false