E-PolyLearning

1. Which of the following statements is not correct?
a. log10 10 = 1
b. log (2 + 3) = log (2 x 3)
c. log10 1 = 0
d. log (1 + 2 + 3) = log 1 + log 2 + log 3
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Answer: (b).log (2 + 3) = log (2 x 3)

2. If log 2 = 0.3010 and log 3 = 0.4771, the value of log5 512 is:
a. 2.870
b. 2.967
c. 3.876
d. 3.912
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Answer: (c).3.876

3. If log 27 = 1.431, then the value of log 9 is:
a. 0.934
b. 0.945
c. 0.954
d. 0.958
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Answer: (c).0.954

4. If log (a/b) + log (b/a) = log (a + b), then:
a. a + b = 1
b. a - b = 1
c. a = b
d. a^2 - b^2 = 1
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Answer: (a).a + b = 1

5. If log10 7 = a, then log10 (1/70) is equal to:
a. - (1 + a)
b. (1 + a)-1
c. a


10
d. 1


10a
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Answer: (a).- (1 + a)

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