Are the following statements true or false?

a) All Fortran 90 statements start in column 7.

    False.  Only when using fixed source form (not covered).

b) % (percent sign) has no special meaning in Fortran.

    False.  It is used as a selector for an object of derived type.

c) In free source form spaces are allowed anywhere.

    False.  For example, they are not allowed in variable names, or in
    keywords.

d) Colons must be used to separate keywords from names.

    False.  They are not mandatory but it is good practice to use them.

e) A line in Fortran can be any length.

    False.  The maximum line length is 132 for free form source.

f) Only one Fortran statement can appear on a line.

    False.  Semi-colons can be used to separate statements on the same
    line.

g) Which of the following are valid Fortran names:

    v1, V1, 1v, 1V, v_1, _v1, v%1

`v1' and `V1' are valid, `1v' and `1V' are not valid (they start
with a number), `v_1' is valid, `_v1' is not valid (it must start with a
letter), `v%1' is not valid (all characters must be alphanumeric or
underscore).