RRB Government Jobs Exams

15) Guitar strings often go dead- become less responsive and bright in tone after a few days of intense use. A researcher whose son is a guitarist hypothesized that dirt and oil, rather than changes in the material properties of string were responsible. Which of the following investigations is most likely to yield significant information that would help the researcher evaluate his hypothesis?
a) Determining whether a metal alloy is used to make their strings go dead faster than do folk guitarists.
b) Determining whether identical string lengths of the same guage, go dead at different rates when strung on various brands of guitars.
c) Determining whether a dead string and a new string produce different qualities of sound.
d) Determining whether smearing various substances on new guitar strings causes them to go dead.

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RRB Other Question
14) College T has 1000 students, of the 200 students majoring in one or more sciences, 130 are majoring in chemistry and 150 are majoring in biology. If atleast 30 are not majoring in either chemistry or biology, then the number of students majoring both in chemistry and biology could be any number from:
a) 110 to 130
b) 40 to 70
c) 110 to 150
d) 20 to 30
 16) If 75% of the class answered the first question of the test correctly, 55% answered the second question correctly and 20% answered neither of the questions correctly, what % answered both correctly?
a) 10
b) 20
c) 50
d) 65