The Lagrangian of a particle moving in a plane under the influence of a central potential is given by L = 2 1 m ( r ˙ 2 + r 2 θ ˙ 2 ) − V ( r ) . The generalized momenta corresponding to r and θ are given by
A. m r ˙ and m r 2 θ ˙
B. m r ˙ and m r θ ˙
C. m r ˙ 2 and m r 2 θ ˙
D. m r ˙ 2 and m r 2 θ ˙ 2
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The eigen values of the matrix \left[ {\begin{array}{*{20}{c}}
{\cos \theta }&{ - \sin \theta } \\
{\sin \theta }&{\cos \theta }
\end{array}} \right] are
A. B. C. ±1 since, the matrix is unitary
D. 2 1 ( 1 ± i ) , when θ = 30°
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Consider an anti-symmetric tensor Pij with the indices i and j running from 1 to 5. The number of independent components of the tensor is
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The average value of the function f(x) = 4x3 in the interval 1 to 3 is
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The value of C ∮ ( z + 1 ) 4 e 2 z d z , where C is a circle defined by |z| = 3, is
A. 3 8 π i e − 2
B. 3 8 π i e − 1
C. 3 8 π i e
D. 3 8 π i e 2
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Sij and Aij represent a symmetric and an anti-symmetric real-valued tensor respectively in three-dimension. The number of independent components of Sij and Aij
A. 3 and 6 respectively
B. 6 and 3 respectively
C. 6 and 6 respectively
D. 9 and 6 respectively
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For any opeartor A, i(A+ - A) is
A. Hermitian
B. anti-Hermitian
C. unitary
D. orthogonal
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The curl of the vector
A = z i ^ + x j ^ + y k ^ is given by
A. i ^ + j ^ + k ^
B. i ^ − j ^ + k ^
C. i ^ + j ^ − k ^
D. − i ^ − j ^ − k ^
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The Fourier transform F(k) of a function f(x) is defined as
F ( k ) ∫ − ∞ ∞ d x f ( x ) exp ( ik x ) . Then F(k) for f(x) = exp(-x
2 ) is
[ Given: ∫ − ∞ ∞ exp ( − x 2 ) d x = π ] Select an option to see the answer and solution.
Two matrices A and B are said to be similar, if B = P-1 AP for some invertible matrix P. Which of the following statements is not true?
A. Det A = Det B
B. Trace of A = Trace of B
C. A and B have the same eigen vectors
D. A and B have the same eigen values
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The inverse of the complex number 3 − 4 i 3 + 4 i is
A. 25 7 + i 25 24
B. − 25 7 + i 25 24
C. 25 7 − i 25 24
D. − 25 7 − i 25 24
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A 3 × 3 matrix has elements such that its trace is 11 and its determinant is 36. The eigen values of the matrix are all known to be positive integers. The largest eigen value of the matrix is
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The unit vector normal to the surface x2 + y2 - z = 1 at the point P (1, 1, 1) is
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The value of ∫ − i i π ( z + 1 ) d z is
A. zero
B. 2πi
C. -2πi
D. (-1 + 2i)π
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For arbitrary matrices E, F, G and H, if EF - FE = 0 then Trace (EFGH) is equal to
A. Trace (HGFE)
B. Trace (E).Trace (F).Trace (G).Trace (H)
C. Trace (GFEH)
D. Trace (EGHF)
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Consider the differential equation d t 2 d 2 x + 2 d t d x + x = 0
At time t = 0, it is given that x = 1 and d t d x = 0. At t = 1, the value of x is given by
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Given the four vectors {u_1} = \left[ {\begin{array}{*{20}{c}}
1 \\
2 \\
3
\end{array}} \right],\,{u_2} = \left[ {\begin{array}{*{20}{c}}
3 \\
{ - 5} \\
1
\end{array}} \right],\,{u_3} = \left[ {\begin{array}{*{20}{c}}
2 \\
4 \\
{ - 8}
\end{array}} \right].\,{u_4} = \left[ {\begin{array}{*{20}{c}}
3 \\
6 \\
{ - 12}
\end{array}} \right]
The linearly dependent pair is
A. u1 , u2
B. u1 , u3
C. u1 , u4
D. u3 , u4
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Eigen values of the matrix \left[ {\begin{array}{*{20}{c}}
0&1&0&0 \\
1&0&0&0 \\
0&0&0&{ - 2i} \\
0&0&{2i}&0
\end{array}} \right] are
A. -2, -1, 1, 2
B. -1, 1, 0, 2
C. 1, 0, 2, 3
D. -1, 1, 0, 3
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The eigen values of the matrix A = \left[ {\begin{array}{*{20}{c}}
0&i \\
i&0
\end{array}} \right] are
A. real and distinct
B. complex and distinct
C. complex and coinciding
D. real and coinciding
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