Practical english for the third-year

3   Read the passage and write TRUE, FALSE or NOT GIVEN 
1  Polygraphs are more commonly known as lie detectors.                          __________________ 
2  There are three different types of questions used during polygraph tests.__________________ 
3  People taking the test are asked every question twice.                              __________________ 
4  Specific questions are followed by irrelevant questions.                          __________________ 
5  The majority of questions asked during a polygraph test are irrelevant. ___________________ 
6  There is general agreement among scientists that polygraphs are unreliable. _______________