CompTIA A+® Certification All-In-One For Dummies®, 2nd Edition

2.5. Answers

1. B. Capacity is not measured by a multimeter. Voltage, current, continuity, and resistance are commonly measured with a multimeter. See "Multimeter".

2. C. Network loopback plugs are used to reduce error messages related to unplugged network cables. Review "Miscellaneous tools".

3. B. The Fn key is not usually used to immediately power off the computer; that is usually done with the power button. Check out "Laptops".

4. D. Power levels for internal devices are supposed to be 12V and 5V. Peruse "Power supplies and batteries".

5. C. Extension magnets are used to pick up dropped metal items. Take a look at "Miscellaneous tools".

6. A, D. The system BIOS on some systems allow for testing of IRQs, memory, hard disks, CPU processing ability, and most internal components. Peek at "CMOS and BIOS".

7. B. Beep errors are the standard way that major system startup failures are reported to the user. Look over "POST errors".

8. C. Reduced CPU performance is often caused by the temperature of the CPU exceeding limits, and it reduces power to reduce the temperature. Excess temperatures usually occur when the heat sink fan fails. Study "Processor/memory".

9. A. Security bits are paired with security screws to prevent users from opening system cases. Refer to "Miscellaneous tools".