This section contains questions in which only one of the four possible answers makes a true statement.   This type is often used when the answer is a numerical value, such as problems which require a calculation.   For example:

    B1.     If a radiographic technique requires 100 mAs and the maximum MA is 50 mA, the shortest possible exposure time will be:   (Go ahead and select an answer).

        a.     ____ 0.2 sec.

        b.     ____ 0.5 sec.

        c.     ____ 2 sec.

        d.     ____ 5 sec.

    The correct answers in this type of question are selected by the exam writer to come from common and easy to make mistakes in a calculation.   These include decimal point errors and inverted answers.   Hopefully you selected c. (2 sec.) for your answer.   Answer "a" would result from a decimal point error and "b" from an inverted calculation.

    The best strategy is to:

    1.     Think through or visualize the problem before making the final calculation.   Estimate the approximate answer by applying the appropriate principles.

    2.     Perform the necessary calculations with care.

    It is easy to miss the correct answer by attempting to plug into a formula without understanding the principles.

    It is not unusual for a question of this type to appear to require a complex and difficult calculation using exponents, logs, etc.   These problems can be solved if you apply the principles and use bracketing as will be illustrated later.

    With questions of this type which do not require a numerical answer, a different strategy is used.

    The objective is to select the one correct or 'best' answer.   This usually requires comparing all of the answers.

    If one of the answers is obviously the correct one, then it is easy.   However, if you are not sure, begin to eliminate the ones which are obviously not correct.   If you can eliminate down to two possibilities, you can then make an "intelligent guess" with a much better chance of being correct.

    Scoring:     A percent score is obtained by dividing your number of correct answers by the number of questions, and multiplying the result by 100.

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