Tests are powerful educational tools that serve at least four functions. First, tests help you evaluate students and assess whether they are learning what you are expecting them to learn. Second, well-designed tests serve to motivate and help students structure their academic efforts. Students study in ways that reflect how they think they will be tested. If they expect an exam focused on facts, they will memorize details; if they expect a test that will require problem solving or integrating knowledge, they will work toward understanding and applying information. Third, tests can help you understand how successfully you are presenting the material. Finally, tests can reinforce learning by providing students with indicators of what topics or skills they have not yet mastered and should concentrate on. Despite these benefits, testing is also emotionally charged and anxiety producing.The move to on-line and computer based assessment is a natural outcome of the increasing use of information and communication technologies to enhance learning.In Tamilschools.net, we have designed our Exams Online contents based on Bloom’s Taxonomy.Remembering: can the student recall or remember the information? define, duplicate, list, memorize, recall, repeat, reproduce stateUnderstanding: can the student explain ideas or concepts? classify, describe, discuss, explain, identify, locate, recognize, report, select, translate, paraphraseApplying: can the student use the information in a new way? choose, demonstrate, dramatize, employ, illustrate, interpret, operate, schedule, sketch, solve, use, write. Analysing: can the student distinguish between the different parts? appraise, compare, contrast, criticize, differentiate, discriminate, distinguish, examine, experiment, question, test.Evaluating: can the student justify a stand or decision? appraise, argue, defend, judge, select, support, value, evaluateCreating: can the student create new product or point of view? assemble, construct, create, design, develop, formulate, write.