PG TRB , POLYTECHNIC TRB & TNSET - · PDF filek.s academy, salem-pg trb question paper k.s...

K.S ACADEMY, SALEM-PG TRB QUESTION PAPER
K.S ACADEMY, SALEM PG TRB, POLYTECHNIC TRB & TNSET COACHING CENTRE FOR PHYSICS CELL:9042976707 Page 1
PG TRB , POLYTECHNIC TRB & TNSET
COACHING CENTRE FOR PHYSICS
MODEL EXAMINATION FOR DIRECT RECRUITMENT OF POST GRADUATE
ASSITENT IN GOVERNMENT SCHOOLS-2017
8 th
FULL TEST
TIME: HOURS Marks: 150
*****************************************************************************
General Instruction to Candidates :
At the commencement of examination, the question booklet will be given to you. In the
first 5 minutes, you are requested to open the booklet and compulsorily examine it as
below :
To have access to the Question Booklet, tear off the paper seal on the edge of this cover
page.
Rough Work is to be done in the end of this booklet.
Answers are to be marked on the OMR answer sheet
Use only Black Ball point pen to shade the answer.
Hand over the OMR answer sheet at the end of the examination to the Invigilator.
This book contains 22 pages
Answer all the question:
1.A small body of mass m is suspended from a retort stand with light inextensible string and
is made to oscillate. The Lagrangian of the system is
a) m b)
c)
d)
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2. The motion of an unconstrained rigid body can be described by
a) six coordinates b) three Cartesian coordinates
c) three Euler angles d) three Cartesian and three Euler angles
3. One of the Hamiltonian`s equations of motion is
a)
b)
c)
d)
4. The Lagrangian L of a particle of mass m for which its momentum is conserved is
a)
b)
c) d)
5. The Hamiltonian is for Lagrangian L =
a)
b)
c) d)
6. SI unit of Poynting vector are
a) Joule/ b) Watt/
c) Joule/ d) Watt/
7. Ampere`s law in integral form is
a) b)
c) d)
8. The maximum efficiency of reflex klystron is
a) 58% b) 10% c) 22.7% d) 64%
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9. The velocity of plane electromagnetic wave in free space is 3 x m/s, the wave velocity in
lossess medium with and is
a) 3 x b)
c)
d)
10.
10. In a travelling electromagnetic wave E and H fields with respect to time are
a) of phase difference 90 b) of phase difference 45
c) of phase difference 135 d) in phase
11. The Lorentz force law is expressed as
a) b)
c) d)
12. The magnetic field accompanying a beam of light can be accurately described as
a) parallel to the direction of its motion
b) parallel to the electric field but out of phase by 90
c) perpendicular to both electric field and direction of travel
d) perpendicular to the electric field but out of phase by 90
13. Inertial system of reference is one in which
a) Newton`s 1st law holds
b) forces due to acceleration of distant stars relative to the system are present
c) uniform rotation is present
d) Euclidean geometry does not hold
14. A one metre rigid rod is at rest along axis in an internal system which is moving with
constant velocity 0.8C relative to another inertial system S also the common positive X- axis.
For an observer in S, the length of the rod is
a)
b)
c) 0.36 metre d)
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15. In relativistic mechanics, kinetic energy is given by
a) b)
c)
d)
16. The de Broglie wavelength associated with an electron of mass m and accelerated by a
potential V is
a)
b)
c)
d)
17. The rest mass of a photon is
a) 1.67 x b) zero c) 1.67 x d) 1.67 x
18. Michaelson-Morley experiment was conducted to
a) measure velocity of light b) test the validity of either hypothesis
c) verify Doppler`s effect d) verify photo-electric effect
19. Covariant form of Maxwell`s equations implies
a) that they are written in 4 vector notation
b) that the four equations are reduced into 2
c) writing the equations in terms of electric and magnetic potentials
d) that the form of equations is unchanged when one goes from one reference system to another
20. The mean energy of quantum oscillator is
a) equal to KT b) always greater than KT
c) always less than KT d) equal to zero
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21. Which of the following is correct?
a) b)
c) d) all of the above
22. A square matrix A is said to be unitary, if
a) A = I b) A = I c) AA* = I d) None of these
23.The trace of the product of two matrices A and B is independent of
a) Order of addition b) Order of multiplication
c) Both a and b d) None of these
24. The value of given trace of the matrix
a) 2 b) 4 c) 6 d) 8
25. The value of (rn) is.
a)
b)
c)
d) nr
n-2
26. The vectors 2 and are coplanar if the value of is
a) 81 b) 18 c) 9 d) 36
27. Gaussian distribution is written a [where
a)
b)
c)
d)
2 The property of function is
a) b)
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c) d)
29. The existence of curl of the vector field at a point indicates.
a) circulation b) No circulation c) vorticity d) a and c
30. What is the value of J-3/2 ?
a) 0 b) c) 1 d) -1
31. Multiplication law of probability is written as
a) P
b)
c)
d)
32. If the probabilities that A and B will die within a year are P and Q respectively, then the
probability that only one of them will be alive at the end of the year is
a) Pq b) P (1-q) c) q (1-p) d) (p + q 2qp)
33. A and B are two independent events. The probability that both A and B occur, is 1/6 occurs
is 1/3. Then the probability occurrence of A is---
a) b) 1/3 c) 1/5 d) 1/6
34. In a collectio

PG TRB , POLYTECHNIC TRB & TNSET - · PDF filek.s academy, salem-pg trb question paper k.s...

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