Explanation: Since Guarded is always used with the BLOCK statement which itself is a block statement and contains concurrent statements. So, wherever we are using guarded, it means that the statement will be executed concurrently.

Explanation: MAP is generally used with PORT for mapping of the components. PORT MAP statement is used for instantiation of the component after its declaration is being done.

Explanation: IMPURE keyword is used to define impure functions. An Impure function is a function which can return some different type given that the actual parameters are same.

Explanation: Inertial delay is the default delay in VHDL. If the assignment statement is y <= x AFTER 10 ns; then it will be same as y <= INERTIAL x AFTER 10 ns; There is no difference between two given statements. So, adding inertial doesn’t affect the assignment.

Explanation: The Transport delay is analogous to the delay incurred by passing a current through a wire and therefore, it is also called wire delay. To specify the transport delay type in an assignment, the keyword TRANSPORT is used.

Explanation: INOUT is a kind of mode of a signal specified in any entity or architecture. The signal can have four modes- IN, OUT, INOUT and BUFFER. So, INOUT is a mode of signal which is used to specify the signal can be used as input as well as output type.

Explanation: LABEL is also a reserved word in VHDL. However, we can write the name of label in starting of any specific statement. But, LABEL itself is a reserved word used for specify a label name in an attribute statement.

Explanation: LINKAGE keyword is associated with signals in VHDL. It is used to link VHDL ports with non-VHDL ports. This corresponds to the mode of a signal and is used when we need to connect VHDL design to some non-VHDL ports.

Explanation: LINKAGE is same as INOUT mode of a signal. In case of LINKAGE, we can use the signal as we can use it in INOUT mode. There is no difference between LINKAGE and INOUT modes of a signal.

Explanation: MOD is the modulus operator which can be used on two integer operands. It is actually an arithmetic operator which can be applied to integer types only. It returns the remainder after dividing first operand by the second operand.