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JEE Questions for Maths Differential Equations Quiz 4 - MCQExams.com
JEE
Maths
Differential Equations
Quiz 4
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An integrating factor of the differential equation
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If y(
x
) satisfies the differential equation y ' - y tan
x
= 2
x
sec
x
and y (= 0, then
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x = y3 + Cy
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x = y2 + Cy
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x3 = y3 + Cy
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None of these
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An integrating factor of the differential equation (1 +
x
2
) dy/d
x
+
x
y =
x
is
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x
Integrating factor (IF) of the differential equation
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The solution of y d
x
-
x
dy + log
x
d
x
= 0 is
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y - log x - 1 = Cx
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x + log y + 1 = Cx
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y + logx + 1 = Cx
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y + log x - 1 = Cx
Solution of the differential equations cos
x
dy = y (sin
x
- y)d
x
, 0 <
x
< π/2, is
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sec x = (tan x + C) y
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y sec x = tan x + C
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y tan x = sec x + C
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tan x = (sec x + C)y
The equation of one of the curves whose slope at any point is equal to y + 2
x
is
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y = 2(ex + x - 1)
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y = 2(ex - x - 1)
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y = 2(ex - x + 1)
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y = 2(ex + x + 1)
The solution of the differential equation
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y = - x2 - 2x - 2 + Cex
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y = x2 + 2x + 2 - Cex
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x = - y2 - 2y + 2 - Cey
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x = - y2 - 2y - 2 + Cey
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x = y2 + 2y + 2 - Cey
The solution of the differential equation
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The solution of the differential equation
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The solution of the differential equation
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y = x log x + x
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y = log x + x
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y = x log x + x2
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y = xe(x - 1)
The solution of the differential equation
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y = x3 (ex - e)
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y = x3 (e - ex)
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y = x2 (ex - e)
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y = x2 (e - ex)
The integrating factor of the differential equation
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The solution of the differential equation
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The solution of the differential equation
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The solution of the differential equation
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To reduce the differential equation
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The solution of the differential equation
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An integrating factor of the differential equation (1 + y +
x
2
y) d
x
+ (
x
+
x
3
)dy = 0 is
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log x
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x
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ex
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1/x
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- (1/x)
The solution of differential equation
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The solution of the differential equation
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Both I and II is correct
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Neither I nor II is incorrect
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I is correct, II is incorrect
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I is incorrect, II is correct
Let the population of rabbits surviving at a time t be governed by the differential equation
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400 - 300et/2
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300 - 200et/2
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600 - 500et/2
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400 - 300e-t/2
The equation of the curve for which the square of the ordinate is twice the rectangle contained by the abscissa and the intercept of the normal on X - axis and passing through (2,is
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x2 + y2 - x = 0
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4x2 + 2y2 - 9y = 0
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2x2 + 4y2 - 9x = 0
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4x2 + 2y2 - 9x = 0
A gardener is digging a plot of land. As he gets tried, he works more slowly. After t min, he is digging at a rate of 2/√t m
2
/min. How long will take him to digging an area of 40 sqm ?
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100 min
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10 min
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30 mm
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40 min
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0
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3
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1
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2
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A present, a firm is manufacturing 2000 items, It is estimated that the rate of change of production P with respect to additional number of workers
x
is given by dp/d
x
= 100 - 12√
x
. If the firm employees 25 more workers, then the new level of production of item is
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2500
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3000
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3500
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4500
For the population p(t) at time t of a certain mouse species, the differential equation
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2 log 18
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log 9
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1/2 log 18
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log 18
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The equation of the curve whose tangent at any point (
x
, y) makes an angle tan
-1
(2
x
+ 3y) with X - axis and which passes through (1,is
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6x + 9y + 2 = 26e3(x - 1)
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6x - 9y + 2 = 26e3(x - 1)
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6x + 9y - 2 = 26e3(x - 1)
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6x - 9y - 2 = 26e3(x - 1)
The equation of the curve satisfying the equation (
x
y -
x
2
)dy/d
x
= y
2
and passing through the point (-1,is
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y = (log y - 1)x
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y = (log y + 1)x
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x = (log x - 1)y
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x = (log x + 1)y
The slope at any point of a curve y =
f
(
x
) is given by dy/d
x
= 3
x
2
and it passes through (-1, 1). The equation of the curve is
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y = x3 + 2
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y = -x - 2
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y = 3x3 + 4
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y = -x3 + 2
A curve having the condition that the slope of tangent at some point is two times the slope of the straight line joining the same point to the origin of coordinates, is a/an
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circle
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ellipse
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parabola
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hyperbola
The equation of the curve satisfying the differential equation y
2
(
x
2
+= 2
x
y
1
passing through the point (0,and having slope of tangent at
x
= 0 as 3 is
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y = x3 + 3x + 1
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y = x3 - 3x + 1
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y = x2 + 3x + 1
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y = x2 - 3x + 1
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The equation of the curve through the point (1,and whose slope is
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2x + (y -(x += 0
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2x - (y -(x += 0
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2x + (y -(x -= 0
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None of these
The differential equation of the curve for which the initial ordinate of any tangent is equal to the corresponding subnormal, is
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non - linear
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homogenous
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in variable separable from
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None of the above
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None of these
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None of these
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None of these
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