1. Electrical signals associated with an electromygram (EMG) are characterised a

Question

1. Electrical signals associated with an electromygram (EMG) are characterised and identified by their: (a) period and amplitude, (b) frequency and amplitude, (c) period and frequency, (d) impedance and frequency.

2. An electrical signal is detected when measuring: (a) pH, (b) force, (c) pressure, (d) temperature

3. A material which under certain conditions alters resistance is described as a: (a) semiconductor, (b) superconductor, (c) conductor, (d) insulator sensor

4. Static electricity is produced by: (a) a generator, (b) an electrochemical cell, (c) the transfer of protons, (d) a transfer of electrons, (e) a nuclear reaction

5. A 3-phase power: (a) provides a more steady power supply, (b) provides a greater current than single phase power, (c) is used for very small electrical devices, (d) is a very large direct current source, (e) is used in heavy industry only

6. Electrodes are sensors used to detect: (a) temperature changes, (b) electrical signals, (c) pressure changes, (d) movement, (e) infrared waves

Explanation / Answer

1. (c) Period and frequency

2. (c) Pressure

3. (a) Semiconductor

4. (a) provides a more steady power supply

5. (b) Electrical signals

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