1
NDA Mathematics 4 September 2022
MCQ (Single Correct Answer)
+2.5
-0.83
Change Language
If f(x) = ln (x + $\sqrt{1+\text{x}^2}$), then which one of the following is correct ?
A
f(x) + f(−x) = 0
B
f(x)−f(−x) = 0
C
2f(x) = f(−x)
D
f(x) = 2f(−x)
2
NDA Mathematics 10 April 2022
MCQ (Single Correct Answer)
+2.5
-0.83
Change Language
A radioactive substance decays at a rate proportional to the amount of substance present. If half of the substance decays in 100 years, then what is the decay constant (proportionality constant) ?
A
$\frac{\ln 2}{100}$
B
$\frac{\ln 5}{100}$
C
$\frac{\ln 10}{100}$
D
$\frac{2 \ln 2}{100}$
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