1
MHT CET 2020 16th October Morning Shift
MCQ (Single Correct Answer)
+2
-0

The bacteria increases at the rate proportional to the number of bacteria present. If the original number '$$N$$' doubles in $$4 \mathrm{~h}$$, then the number of bacteria in $$12 \mathrm{~h}$$ will be

A
4N
B
8N
C
6N
D
3N
2
MHT CET 2020 16th October Morning Shift
MCQ (Single Correct Answer)
+2
-0

The rate of decay of certain substance is directly proportional to the amount present at that instant. Initially, there are $$27 \mathrm{~gm}$$ of certain substance and $$3 \mathrm{~h}$$ later it is found that $$8 \mathrm{~gm}$$ are left, then the amount left after one more hour is

A
$$\frac{20}{3} \mathrm{~gm}$$
B
$$\frac{16}{3} \mathrm{~gm}$$
C
$$\frac{19}{3} \mathrm{~gm}$$
D
$$\frac{17}{3} \mathrm{~gm}$$
3
MHT CET 2020 16th October Morning Shift
MCQ (Single Correct Answer)
+2
-0

The integrating factor of the differential equation $$\left(1+x^2\right) d t=\left(\tan ^{-1} x-t\right) d x$$ is

A
$$e^{\tan ^{-1} x}$$
B
$$-e^{\frac{\left(\tan ^{-1} x\right)^2}{2}}$$
C
$$-e^{\tan ^{-1} x}$$
D
$$e^{\frac{\left(\tan ^{-1} x\right)^2}{2}}$$
4
MHT CET 2019 3rd May Morning Shift
MCQ (Single Correct Answer)
+2
-0

The order of the differential equation of all circles which lie in the first quadrant and touch both the axes is......

A
two
B
three
C
one
D
four
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