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THE BASICS; what is the vertical axis of a graph called?
A. z-axis
B. x-axis
C. y-axis
D. time-axis Correct Answer - y-axis ;
the vertical axis of a graph is called the y-axis and extends up and down
THE BASICS; what is the name of the horizontal axis of a graph? Correct Answer - x-axis
the horizontal axis of a graph is the x-axis. the x-axis extends side to side.
THE BASICS; how are scores on the ultrasound board exams related to study time? Correct
Answer - directly ;
two variables are related when changes in one variable result in changes in the other. when the
changes go in the same direction (both increase or both decrease), variables are directly
related. Since scores increase as study time increases, these variables are directly related.
THE BASICS; how are caloric intake and weight related? Correct Answer - directly ;
these two terms are directly related. as food intake increases, weight increases. similarly, as
food intake decreases, weight decreases.
THE BASICS; how is weight related to a sonographer's time spent exercising? Correct Answer -
inversely ;
,two variables are related when changes in one variable result in changes in the other. when the
changes follow in the opposite direction (one increases as at the other decreases), the variables
are inversely related.
THE BASICS; what is the reciprocal of 1,000? Correct Answer - 0.001 ;
a pair of reciprocal numbers, when multiplied together, have a value of 1. in this case, 1,000 x
0.001 = 1.
THE BASICS; what is the reciprocal of 5? Correct Answer - 1/5 ;
a pair of reciprocal numbers, when multiplied together, have value of 1. in this case, 5 x 1/5 = 1
THE BASICS; what is the reciprocal of 1/10? Correct Answer - 10 ;
a pair of reciprocal numbers, when multiplied together, have value of 1. in this case, 10 x 1/10 =
1
THE BASICS; a sack contains 6 pounds of flour. the contents of the bag are increased by a factor
of 5. how much flour is in the bag? Correct Answer - 30 pounds ;
the term "increase by a factor" means to multiply. 6 x 5 = 30 pounds.
THE BASICS; a bouquet has 30 flowers. the size of the bouquet is decreased by a factor of 3.
how many flowers remain? Correct Answer - 10 ;
the term "decrease by a factor" means to divide. 30/3 = 10.
THE BASICS; which of the following is not a measure of area?
A. square cm
B. meters squared
C. cubic meters
D. feet x feet Correct Answer - cubic meters ;
,Cubic meters are not used to measure
area; they are used to measure volume. An area is measured in units of distance
squared. For example, a rectangle's area is
its length multiplied by its width, and can be reported in square feet, in^2, or square miles
THE BASICS; a sonographer measures the perimeter of an anatomical structure. which of the
following choices is a reasonable value for the measurement?
A. 6 cm^2
B. 5 cc
C. 15 mm
D. 18 dB Correct Answer - 15 mm
"perimeter" means the length of the outer boundary of a structure. for example, a square with
an edge that is 5 inches long will have a perimeter measuring 20 inches (four sides, each with a
length of 5 inches).
THE BASICS; what are the units associated with the circumference of a circle? Correct Answer -
mm ;
the circumference of a circle is the length of the circle's outer boundary and is measured in
units of length
THE BASICS; the volume of a cystic structure is estimated from sonographic data. which of the
following is an acceptable measurement of this volume?
A. 6
B. 6 cm
C. 6 cm^2
D. 6 cm^3 Correct Answer - 6 cm^3
the units of volume are length cubes, such as ft^3 or cubic centimeters. volume may also be
expressed as length to the third power.
, THE BASICS; the speed of the red blood cells traveling through a blood vessel is 750 cm/sec. you
are asked to measure this speed in miles per hour. what information would be sufficient for you
to complete your task? Correct Answer - how many seconds per hour and the number of miles
in a centimeter;
To convert one unit to another requires a
factor that relates the two terms. For
example, to change a measurement of
length from feet into inches, we must know. now many inches are in a foot. In this case We are
asked to convert cm per sec into miles per hour. Therefore, we require two pieces of
information: the relationship between seconds and hours (relating one Unit of time to another)
and the relationship between miles and centimeters (relating one unit of distance to another).
When units are changed, the actual amount does not change. For example, ten dimes provide
the same purchasing power as four quarters. The units may be different, but the "total picture"
remains the same.
THE BASICS; how much bigger is one billion than one thousand? Correct Answer - 1,000,000
times ;
a billion is one million times larger than a thousand. a million is 1,000,000.
THE METRIC SYSTEM; Select the sequence that appears in increasing order.
A. mega, kilo, hecto, milli, gigi
B. nano, milli, micro, deci, deca, mega
C. centi, deci, deca, hecto
D. milli, hecto, centi, deci, nano, gigi Correct Answer - centi, deci, deca, hecto;
centi means "one-hundredth", deci means "one tenth", deca means "ten", and hecto means
"hundred". this sequence is increasing, starting from the smallest and ending with the largest.