Test: Differential Equations & Multiple Integrals- 2
30 Questions MCQ Test GATE Mechanical (ME) 2023 Mock Test Series | Test: Differential Equations & Multiple Integrals- 2
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The volume of an object expressed in spherical co-ordinates is given by
The value of the integral is
By a change of variable x (u, y) = uv, y (u, v) = v/u is double integral, the integrand f(x, y) changes to f(uv, v/u) φ (u,v). Then, φ (u, v) is
Consider the shaded triangular region P shown in the figure. What is 
The equation of the line AB is
A path AB in the form of one quarter of a circle of unit radius is shown in the figure. Integration of (x + y)2 on path AB traversed in a counterclockwise sense is
A parabolic cable is held between two supports at the same level. The horizontal span between the supports is L. The sag at the mid-span is h. The equation of the parabola is 
where x is the horizontal coordinate and y is the vertical coordinate with the origin at the centre of the cable. The expression for the total length of the cable is
We know length of the curve f(x) between x = a and x = b given by
A surface S(x,y)=2x+5y-3 is integrated once over a path consisting of the points that satisfy ( x +1)2+ (y − 1)2 = √2 . The integral evaluates to
The order of the differential equation
The order of a differential equation is the order of the highest derivative involving in
equation, so answer is 2.
The solution of the differential equation 
under the boundary conditions
(i) y =y1 At x = 0 and
(ii) y =y2 At x = ∞,
Where k, y1 and y2 are constants, is
A function n(x) satisfies the differential equation 
where L is a constant. The boundary conditions are: n(0)=K and n(∞)= 0. The solution to this equation is
For finite solution c1 = 0
The solution of the differential equation 
Given differential equation is
Integra ling we get
then what is y(e)?
It is linear differential equation.
The solution of dy/dx = y2 with initial value y (0) = 1 bounded in the interval
The solution to the differential equation f’’(x)+4f’(x)+4f(x)=0 is
Let y(x) = emx (m ≠ 0)be the trial soln .Auxiliary equation. m2 + 4m+ 4 = 0 ⇒(m+ 2)2 = 0
In particular, when A =1,B =1,then f(x) = (1 + x)e−2x
= e−2x + xe−2x
Since, the differential equation cannot be expressed in x/y or y/x form, therefore, it is an example of non-homogeneous differential equation.
Which of the following is a solution of the differential equation
Here p = 4andq = 3.The given equation becomes
f is non linear.
Given that .. .x+ 3x= 0, and x(0)=1, x(0) = 0 what is x(1)?
Auxiliary equn of x11 + 3x = 0 is
m2 + 3 = 0
The degree of the differential equation 
The solution for the differential equation 
with the condition that y = 1 at x = 0 is
A spherical naphthalene ball exposed to the atmosphere loses volume at a rate proportional to its instantaneous surface area due to evaporation. If the initial diameter of the ball is 2 cm and the diameter reduces to 1 cm after 3 months, the ball completely evaporates in
By the given condition
Solution of the differential equation 
represents a family of
Let y = emx (m ≠ 0) be the trial solution.
A body originally at 60ºC cools down to 40ºC in 15 minutes when kept in air at a temperature of 25ºC. What will be the temperature of the body at the end of 30 minutes?
The partial differential equation that can be formed from z = ax + by + ab has the form
With K as constant, the possible solution for the first order differential equation 
is
The boundary-value problem yn + λy = 0, y(0) = y(λ) = 0 will have non-zero solutions if and only if the values of λ are
The solution of the differential equation 
with the condition that y = 1 at x = 1, is
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27 docs|243 tests
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27 docs|243 tests
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