COGNITIVE ASSESSMENT
In your engineering class, you are required to calculate the approximate size of a series of chips. Which of the following is true?
A. Most chips are no bigger than one-half-inch square.
B. Most chips are no bigger than three-quarter-inches square.
C. Most chips are no bigger than one inch square.
D. Most chips are no bigger than two inches square.
Answer: A
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A blind write occurs when a transaction writes a database item it has not read. For example, in the Student Registration System a transaction might compute a student’s GPA by reading her course grades, computing the average, and then (blindly) writing the result in the appropriate database item without first reading that item. Some applications have the property that no transactions perform blind writes. Show that for such applications
a. Viewequivalence is equivalent to conflict equivalence. b. The timestamp-ordered concurrency control described in Section 20.9.1 never uses the Thomas Write Rule. c. In the timestamp-ordered concurrency control described in the text, for each item, x, that a transaction, T, w rites, w hen T commits, rt(x) = wt(x) = TS(T).
Assigning a derived class reference to a base class variable is safe:
a. because the derived class has an object of its base class. b. because the derived class is an object of its base class. c. only when the base class is abstract. d. only when the base class is concrete.
A sort order that sorts text alphabetically (A to Z) and sorts numbers from the lowest number to the highest number.
A. Ascending B. Descending C. High-level D. Upward
Evaluate the Hero's formula for the area of triangle 
using the given values of the variables. 
A. 
B. 
C. 
D. 
E. 