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1
JEE Main 2021 (Online) 18th March Morning Shift
MCQ (Single Correct Answer)  +4  -1
The differential equation satisfied by the system of parabolas

y2 = 4a(x + a) is :
A
$$y{\left( {{{dy} \over {dx}}} \right)^2} - 2x\left( {{{dy} \over {dx}}} \right) - y = 0$$
B
$$y{\left( {{{dy} \over {dx}}} \right)^2} - 2x\left( {{{dy} \over {dx}}} \right) + y = 0$$
C
$$y{\left( {{{dy} \over {dx}}} \right)^2} + 2x\left( {{{dy} \over {dx}}} \right) - y = 0$$
D
$$y\left( {{{dy} \over {dx}}} \right) + 2x\left( {{{dy} \over {dx}}} \right) - y = 0$$
2
JEE Main 2021 (Online) 17th March Evening Shift
MCQ (Single Correct Answer)  +4  -1
If the curve y = y(x) is the solution of the differential equation

$$2({x^2} + {x^{5/4}})dy - y(x + {x^{1/4}})dx = {2^{9/4}}dx$$, x > 0 which

passes through the point $$\left( {1,1 - {4 \over 3}{{\log }_e}2} \right)$$, then the value of y(16) is equal to :
A
$$4\left( {{{31} \over 3} - {8 \over 3}{{\log }_e}3} \right)$$
B
$$\left( {{{31} \over 3} - {8 \over 3}{{\log }_e}3} \right)$$
C
$$\left( {{{31} \over 3} + {8 \over 3}{{\log }_e}3} \right)$$
D
$$4\left( {{{31} \over 3} + {8 \over 3}{{\log }_e}3} \right)$$
3
JEE Main 2021 (Online) 17th March Evening Shift
MCQ (Single Correct Answer)  +4  -1
Let y = y(x) be the solution of the differential equation

$$\cos x(3\sin x + \cos x + 3)dy = (1 + y\sin x(3\sin x + \cos x + 3))dx,0 \le x \le {\pi \over 2},y(0) = 0$$. Then, $$y\left( {{\pi \over 3}} \right)$$ is equal to :
A
$$2{\log _e}\left( {{{\sqrt 3 + 7} \over 2}} \right)$$
B
$$2{\log _e}\left( {{{3\sqrt 3 - 8} \over 4}} \right)$$
C
$$2{\log _e}\left( {{{2\sqrt 3 + 10} \over {11}}} \right)$$
D
$$2{\log _e}\left( {{{2\sqrt 3 + 9} \over 6}} \right)$$
4
JEE Main 2021 (Online) 17th March Morning Shift
MCQ (Single Correct Answer)  +4  -1
Which of the following is true for y(x) that satisfies the differential equation

$${{dy} \over {dx}}$$ = xy $$-$$ 1 + x $$-$$ y; y(0) = 0 :
A
y(1) = 1
B
y(1) = e$$-$$$${1 \over 2}$$ $$-$$ 1
C
y(1) = e$${1 \over 2}$$ $$-$$ e$$-$$$${1 \over 2}$$
D
y(1) = e$${1 \over 2}$$ $$-$$ 1
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