How can the volume of an irregularly shaped object be measured most accurately?
A by visual inspection
B. by its weight
C. by immersing it in water
D. by ultrasound scanning - CORRECT ANSWER-C. by immersing it in water
What term is used to describe the effects of an ultrasound wave on living tissues?
A. toxic effects
B. acoustic propagation properties
C. biological effects
D. transmission properties - CORRECT ANSWER-C. biological effects
As sound travels through a medium, what term describes the effects of the medium on
the sound wave?
A. toxic effects
B. acoustic propagation properties
C. bioeffects
D. transmission properties - CORRECT ANSWER-B. acoustic propagation properties
A pair of reciprocal numbers, when
multiplied together, have a value of +
In this case, 1,000 x 0.001 = 1
What is the reciprocal of 5?
multiplied together, have a value of 1
A. one-hundredth
B. 5
C. 1/5
D. one-millionth - CORRECT ANSWER-C. 1/5
In this case, 5 x 1/5 = 1
What is the reciprocal of 1/10?
A. one-hundredth
B. 10
C. 1/10
D. one-millionth - CORRECT ANSWER-B. 10
,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?
A. 6 pounds
B. 11 pounds
C. 60 pounds
D. 30 pounds - CORRECT ANSWER-D. 30 pounds
A bouquet has 30 flowers. The size of the bouquet is decreased by a factor of 3. How
many flowers remain?
A. 27
B. 0
C. 10
D. 15 - CORRECT ANSWER-C. 10
The term "decrease by a factor" means to
divide.
= 10.
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-C. cubic meters
A sonographer measures the perimeter of an anatomical structure. Which of the
following choices is a reasonable value for boundary of a structure. For example, a the
measurement?
A. 6 cm?
B. 5 cc
C. 15 mm
D. 18 dB - CORRECT ANSWER-C. 15mm
"Perimeter" means the length of the outer
following choices is a reasonable value for
boundary of a structure. For example, a
the measurement?
square with an edge that is 5 inches long
How are caloric intake and weight related?
A. inversely
B. partially
C. reciprocally
,D. directly - CORRECT ANSWER-D. directly
How is weight related to a sonographer's time spent exercising?
A. inversely
B. conversely.
C. directly
D. unrelated - CORRECT ANSWER-A. inversely
What is the reciprocal of 1,000?
A. one-hundredth
B. 1.000
C 0.001
D. one-millionth - CORRECT ANSWER-C. 0.001
What are the units associated with the circumference of a circle?
A. mm
B. mm?
C. cm3
D. mA - CORRECT ANSWER-A. mm
The circumference of a circle is the length
of the circle's outer boundary and is
measured in units of length.
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 cm2
D. 6 cm3 - CORRECT ANSWER-D. 6 cm3
The units of volume are length cubed, such
as ft° or cubic centimeters. Volume may
also be expressed as length to the third
power.
A has no units, whereas B and C have
units of length and area.
The speed of 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?
A. how many seconds in a minute
, and how many blood cells in the vessel
B. the number of miles in a meter
C. how many seconds per hour and the number of miles in a centimeter
D. the direction of red blood cell motion and the Doppler shift frequency - CORRECT
ANSWER-C. 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 how 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.
How much bigger is one billion than one thousand?
A. 1,000 times
B. 1.000.000 times
C. 10 times
D. 10,000 times - CORRECT ANSWER-B. 1,000,000 times
B. A billion is one million times larger than a
thousand. A million is 1,000,000
Select the sequence that appears in increasing order.
A. mega, kilo, hecto, milli, giga
B. nano, milli, micro, deci, deca, mega
C. centi, deci, deca, hecto
D. milli, hecto, centi, deci, nano, giga - CORRECT ANSWER-C. centi, deci, deca, hecto
How many nanoseconds are in 7 seconds?
A. 7,000,000
B. 7,000,000,000
C. 7 million
D. 0.00000007 - CORRECT ANSWER-B. 7,000,000,000
The letters below represent the abbreviations for the prefixes of the metric system.
Select the sequence that appears in decreasing order.
A. m, k, M, g, da
B. g, m, k, d,
C. g, k, di, m, u, n
D. M, k, da, d, c - CORRECT ANSWER-D. M, k, da, d, c