K.S ACADEMY, SALEM- CONTACT , , PG TRB, POLYTECHNIC TRB, ENG TRB, AEEO TRB TNPSC SCIENTIFIC ASSISTANT & TNSET

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1 K.S ACADEMY, SALEM- CONTACT , , PG TRB, POLYTECHNIC TRB, ENG TRB, AEEO TRB TNPSC SCIENTIFIC ASSISTANT & TNSET TRB COACHING CENTRE FOR PHYSICS CONTACT , , ******** PG TRB AND POLYTECHNIC TRB ND BATCH ADMISSION GOING ON. PG TRB AND POLYTECHNIC TRB nd BATCH DEMO CLASS ON 0 MAY 018 (SUNDAY) EFFECTIVENESS OF CLASS WITNESSED ONLY BY ATTENDING THE CLASS WE PROUD TO SAY OUR INSTITUTE QUESTION PAPERS PREPARED BY OWN - NOT COPIED FROM OTHERS INSTITUTE/ STATE QUESTION PAPERS Time:1 Hour Marks: 40 **************************************************************************************** Answer all the question: Problem based questions for POLYTECHNIC TRB 1. A spherical symmetry charge distribution has density ρ v = ρ 0 0 r R 0 r>r The value of electric field For r R is a) ρ 0 R3 3ϵ 0 r a r b) ρ 0 R3 3ϵ 0 r a r c) ρ 0 R 3ϵ 0 r a r. The electric displacement D = zrcos k (1, π 4, 3) is c m d) ρ 0 R 3ϵ 0 r a r then the charge density at a) 11.7 C/m 3 b).86 C/m 3 c) 0.5 C/m 3 d) 100 C/m 3 PHYSICS CELL: , , Page 1

2 K.S ACADEMY, SALEM- CONTACT , , A parallel-plate capacitor with air between the plates having area of 5 cm and plate separation of 3 mm has a voltage 50 sin 10 3 t V applied to its plates. The displacement current is. a) 140 cos 10 3 t na b) 113 cos 10 3 t na c) 50.7 cos 10 3 t na d) 73 cos 10 3 t na 4. Match the following List-I List-II A) Average energy density P) 1 Cε 0E 0 B) Average of Poynting vector Q) 1 ε 0E C) Average momentum density R) 1 μ 0 (E B) D) Pointing vector S) 1 ε C 0E 0 A B C D a) Q P S R b) S P Q R c) Q S P R d) R S P Q 5. Read assertion and reason carefully, select proper option from given below. Assertion : When an electromagnetic wave going through vacuum is described as E = E 0 sin ωt kx then ω k is independent of the wavelength Reason : ω k is speed of the wave. a) Both assertion and reason are true and reason explains the assertion. b) Both assertion and reason are true but reason does not explain the assertion. c) Assertion is true but reason is false. PHYSICS CELL: , , Page

3 K.S ACADEMY, SALEM- CONTACT , , d) Assertion is false and reason is true. 6. A plane sheet of charge carries at y = 1 plane carries current density k = 40a z A m the value of H at the point (0, 0, 0) is a) zero b) 0a x c) 40 a x d) 10a x 7. A uniform plate wave E = E 0 cos(ωt βz)a x is propagating in mediuym. The magnitude and direction of poynting vector is a) E 0 n cos (ωt βz), z direction b) E 0 sin (ωt βz), y direction 0 n 0 c) E 0 cos (ωt βz), z direction d) E 0 cos (ωt βz), y direction n 0 n 0 8. If U 33 nucleus is fissioned by a neutron. The mass of U 33, two fission fragments of mass numbers 96 and 136 and neutron are respectively 33.1amu, amu, amu and amu. The amount of energy released is a) 54.8 MeV b) 00 MeV c) 177 MeV d) 6.7 MeV 9. According to Proton-Neutron theory 1) A free neutron and proton to be contained in the nucleus. ) The electron does not pre-exist in the nucleus but is formed at the time of emission. a) 1 only correct b) only correct c) 1 & are correct d) none of the above 10. The unsuccessful result of shell model is a) It explains the existence of magic numbers and the stability and high binding energy on the basis of closed shells PHYSICS CELL: , , Page 3

4 K.S ACADEMY, SALEM- CONTACT , , b) The spin and parity of 11Na 3 is I = 5 + c) It provides explanation for the ground state spins and magnetic moments of the nuclei d) none of the above 11. r 1 and r are the radii of atomic nuclei of mass numbers 64 and 7 respectively. The ratio r 1 /r is a) 4/3 b) 1 c) 64/7 d) 7/64 1. According to the single particle nuclear shell model, the spin parity of the 17 ground state of O 8 is a) 4 + b) 1 + c) 1 d) According to baryon law of conservation not allowed reaction is a) λ + n p + n + π 0 b) p + n p + n + ϑ c) π μ + ϑ μ d) p + n e + + ϑ 14. The Hamiltonian for the inverse square orbit problem is H = 1 m r + r θ mmg r the value of P θ is a) P θ mr 3 mmg r b) Pr m c) 0 d) P θ mr 15. The Lagrangian for the motion of the masses of Atwood machine is given by a) 1 (m 1 + m + I R )x b) 1 m 1 + m x + m 1 gx + m g(l x) c) 1 Iθ + m1 gx m g(l x) d) θ = gx PHYSICS CELL: , , Page 4

5 K.S ACADEMY, SALEM- CONTACT , , If P is momentum of the particle of rest mass m and energy E then its kinetic energy is a) P C + m C 4 b) mc c) P m d) P C + m C 4 mc 17. The degree of freedom of a vibrating string a) b) 3 c) 6 d) infinity 18.If the Lagrangian of a particle moving in one dimension is L = mx Hamiltonian is a) P x + V(x) b) + V(x) x P c) 1 xp V(x) d) P m + V(x) V(x),the 19. Choose the correct answer for the given Lagrangian L = 1 m x + y mgy a) x is cyclic co-ordinate, P x is constant but energy E is not constant b) y is cyclic, P y is constant and E is also constant c) Both P x and P y are constant and therefore the energy is also constant d) Both P x and E are constant and x is cyclic co ordinate 0. Which of the following is wrong i) Moving rods contract along the direction of motion. ii) Maxwell s equations for the propagation of electromagnetic waves are Lorentz invariant. iii) A metre rod travels with a speed v = 0.8 c along its length, its change in length is 0.6m. iv) If the Poisson bracket x, p = 1 then the Poisson bracket x + p, p is x. a) i & ii b) ii & iii c) iii only d) iii & iv Answer At Last Page PHYSICS CELL: , , Page 5

6 K.S ACADEMY, SALEM- CONTACT , , WE PROUD TO SAY OUR INSTITUTE QUESTION PAPERS PREPARED BY OWN - NOT COPIED FROM OTHERS INSTITUTE/ STATE QUESTION PAPERS PG TRB AND POLYTECHNIC TRB ND BATCH ADMISSION GOING ON. CONTACT , , OUR INSTITUTE RESULTS EXAM NO OF CANDITATE SELECTED PG TRB 013 (100%) PG TRB (86%) TNSET (71%) 6 (74%) PG TRB 017 TNSET 017 WE EXPECT -1 PG TRB AND POLYTECHNIC TRB nd BATCH DEMO CLASS ON 0 MAY 018 (SUNDAY) EFFECTIVENESS OF CLASS WITNESSED ONLY BY ATTENDING THE CLASS PHYSICS CELL: , , Page 6

7 K.S ACADEMY, SALEM- CONTACT , , ம தல வக ப ப கள ஆரம பம Answer key K.S ACADEMY (Exclusively for PHYSICS) (ச ப ப ர யர அக டம ) டவ ன ரய ல வ ஸ வடஷன அர க ல வ லம -1 Q.NO ANS Q.NO ANS 1 C 11 C D 1 D 3 D 13 C 4 C 14 B 5 B 15 A 6 B 16 A 7 C 17 A 8 C 18 B 9 B 19 C 10 D 0 B PHYSICS CELL: , , Page 7

K.S ACADEMY, SALEM- POLYTECHNIC TRB QUESTION PAPER PG TRB,ENG & POLYTECHNIC TRB & TNSET COACHING CENTRE FOR PHYSICS UNIT 4 :ELECTROMAGNETIC THEORY

K.S ACADEMY, SALEM- POLYTECHNIC TRB QUESTION PAPER PG TRB,ENG & POLYTECHNIC TRB & TNSET COACHING CENTRE FOR PHYSICS UNIT 4 :ELECTROMAGNETIC THEORY PG TRB,ENG & POLYTECHNIC TRB & TNSET COACHING CENTRE FOR PHYSICS UNIT 4 :ELECTROMAGNETIC THEORY TIME: 1/2HOURS Marks: 30 ***************************************************************************** ANSWER