No. Physical security measures refer to actual, physical barriers to prevent people from accessing a system or using it in a certain way. An example of a physical security measure would be using locks to prevent theft of computers, or keeping critically important computers in a separate place where they are not likely to be damaged or interfered with.
Some examples of physical security are locks, guards and alarm systems. Anything that is tangible rather than digital that increases security is considered a physical security measure. To clarify the distinction antivirus programs are not physical security measures.
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A reason that would not support the implementation of Defense in Depth is the belief that a single security measure, such as a firewall or antivirus software, is sufficient on its own to protect against all threats. This approach undermines the concept of layered security, which is designed to provide multiple overlapping defenses to mitigate various risks. Relying solely on one solution can lead to vulnerabilities being exploited if that measure fails.
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Washing it is a good preventive measure.
It's when there is something you're trying to stop (prevent) from happening, so you take a preventive measure (do something) to stop the thing you think might happen.
The price various from software to software but most cost around 30 to 50 a year for the protection of three computers. Some anti virus software is a suite or a very large fully featured software. Suites are big and take up memory but they have a lot of useful tools. The best ones that I have seen are AVG 8, Trend Micro Internet Security 14 or 17 and Windows Live Onecare. AVG offers a free ($0) version of their anti-virus software. I have it running on several machines and have found it to be entirely adequate. You can install it as an interim measure until you decide to drop the money to buy an anti-virus suite.
The average computer user can install or have installed virus protection software on the computer. This is the most basic security measure that can be easily applied.
Exercise.
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Yes, arrest is used as a preventive measure. Criminals, thieves and robbers are usually arrested so that they do not cause problems to the public.