How can I prevent TeX hyphenating one occurrence of a word (locally)?

Question

I'm currently typesetting a test using the exam class and the test consists of some True or False statements. Some statements span a couple of lines, but some could fit in a single line, except for the last word, which is hyphenated, like so:

O momento angular de um sistema pode mudar sem a ação de torques ex-
ternos

I know I can make hyphenations by using tor\-que, but I would like to know if there is an opposite that works locally, i.e., not adding \hyphenation{torque} to the preamble because I may want this word hyphanated at some other point.

I know that \mbox{…} does the trick, but I'm not sure if it's a kludge and there's a better solution, specially without extra packages.

Ideas?

Answer 1

The package hyphenat provides a command \nohyphens{}, so that

O momento angular de um sistema pode mudar sem a ação de torques \nohyphens{externos}

should do the trick.

\nohyphens should be used for short parts of text. You should perhaps encapsulate the whole answer (statement?) in \nohyphens{}, but that depends on your content.