38
MCQ (Single Correct Answer)
The equation of normal to the curve $3 x^2-y^2=8$ which is parallel to the line $x+3 y=8$ is
A
$3 x-y=8$
B
$3 x+y+8=0$
C
$x+3 y \pm 8=0$
D
$x+3 y=0$
39
MCQ (Single Correct Answer)
If the curve $a y+x^2=7$ and $x^3=y$, cut orthogonally at $(1,1)$, then the value of $a$ is
A
1
B
0
C
$-6$
D
6
40
MCQ (Single Correct Answer)
If $y=x^4-10$ and $x$ changes from 2 to 1.99, then what is the change in $y$ ?
A
0.32
B
0.032
C
5.68
D
5.968
41
MCQ (Single Correct Answer)
The equation of tangent to the curve $y\left(1+x^2\right)=2-x$, where it crosses $X$-axis, is
A
$x+5 y=2$
B
$x-5 y=2$
C
$5 x-y=2$
D
$5 x+y=2$
42
MCQ (Single Correct Answer)
The points at which the tangents to the curve $y=x^3-12 x+18$ are parallel to $X$-axis are
A
$(2,-2),(-2,-34)$
B
$(2,34),(-2,0)$
C
$(0,34),(-2,0)$
D
$(2,2),(-2,34)$