Topic 6 Quiz

Which one of these correctly describes the difference between sound and ultrasound?
1. Ultrasound is a transverse wave while sound is a longitudinal wave.
2. Ultrasound is a longitudinal wave while sound is a transverse wave.
3. Ultrasound is any sound above the range of human hearing.
4. Ultrasound waves travel much faster in a material than normal sound.
How do bats and dolphins use ultrasound?
1. As SONAR to navigate and detect prey.
2. As RADAR to navigate and detect prey.
3. As SONAR to kill prey.
4. To see.
Which one of these is NOT a use for ultrasound in medicine?
1. Breaking up a gallstone
2. Prenatal scan on a pregant woman.
3. Detecting a blockage in a vein
4. Stopping blood vessels bleeding in a surgical operation.
Which piece of equipment is essential to carry out any ultrasound test?
1. A CRO
2. A camera
3. A transducer
4. A thermal printer
When doing a scan, the ultrasound probe needs to have a special jelly between it and the skin. The reason for this is:
1. The jelly is needed to lubricate the movement of the probes as it passes over the skin.
2. Ultrasound waves are reflected strongly as they hit a material-air boundary.
3. The jelly acts like a lens, focusing the waves.
4. To protect the skin from the harmful effects of ultrasound.
The frequency of an ultrasound scanner is about:
1. 10 000 Hz
2. 20 000 Hz
3. 200 000 Hz
4. 2 000 000 Hz
The trace of a pulse from an ultrasound transducer is displayed at the left of a CRO screen. To the right of the CRO screen is a smaller trace of the echo. This shows that:
1. Ultrasound waves cannot travel in the material
2. That refraction occurs at a boundary.
3. That reflection occurs at a boundary.
4. The transducer is faulty.
The trace of a pulse from an ultrasound transducer is displayed at the left of a CRO screen. To the right of the CRO screen is a smaller trace of the echo. The distance between the two traces gives a direct reading of:
1. the time between the transmission of the pulse and the receiving of the echo.
2. the speed of the ultrasound pulse in the material.
3. the depth of a boundary in the material.
4. the speed of the ultrasound pulse in air.
The MOST likely mistake by GCSE students when working out the distance between the ultrasound probe and the boundary in a material is: (all of these are possible)
1. to use the wrong figure for the speed of sound in the material.
2. to measure the voltage on the CRO instead of the time.
3. to forget to halve the distance worked out from multiplying the speed by the time.
4. to use the wrong formula
Ultrasound is used for cleaning:
1. a floor
2. delicate components.
3. an oily machine.
4. workwear