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

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1 PG TRB,ENG & POLYTECHNIC TRB & TNSET COACHING CENTRE FOR PHYSICS UNIT 4 :ELECTROMAGNETIC THEORY TIME: 1/2HOURS Marks: 30 ***************************************************************************** ANSWER ALL THE QUESTIONS: 1. Vector potential is a vector a) whose curl is equal to the magnetic flux density b) whose curl is equal to the electric field intensity c) whose divergence is equal to the electric potential d) which is equal to the vector product E x H 2. The effect of magnetic field acting normally on a charged particle is observed in the following manner (ENG TRB ) a) It moves in a straight line without deviation b) it moves in a radial path c) it is not affected by the field d) it moves in a direction perpendicular to the field 3. When subjected to a transverse electric field cathode rays move (POLY TRB 2012) a) along a hyperbolic path b) down the potential gradient c) up the potential gradient d) along a circular path 4. If E and B denotes static electric and magnetic fields, which of the following statements is correct a) both E and B are solenoidal b) both E and B are irrotational CELL: Page 1

2 c) E is rotational and B is solenoidal d) E is irrotational and B is solenoidal 5. Gauss law would be invalid if a) there were magnetic monopoles b) the inverse square law were not exactly correct c) Velocity of light is a constant d) velocity of light is not a constant 6. Which of the following is not a correct relation? (POLY TRB ) a) B = A b) E = φ c) E = φ A T d) A = B 7. The intrinsic impedance of a lossy dielectric medium is given by a) jωμ ς c) b) jωε μ jωμ ς+jωε 8. If a dielectric is placed in an electric field, then field strength A) decreases b) increases c) remains unaltered d) becomes zero d) μ ε 9. Maxwell repaired Ampere s law by replacing J by its generalization [TNSET 2012] a)j J - D t b) J J + D t c) J J + B t d) J J - B t 10. The total instantaneous power radiated by an accelerated non relativistic charged particle is given by a) Lienard Wiechart formula b) Coulomb formula CELL: Page 2

3 C) Larmor formula d) Langevin formula 11. The index of refraction n of a medium of permeability µ and permittivity ε is a) n = με b) n = με c) n = μ 0 ε 0 με d) n = με μ 0 ε The total energy of magnetic field is a) H. B d 3 x b) 1 2 H. E d 3 x c) 1 2 H. B d 3 x d) H B d 3 x 13. As electromagnetic waves travel in free space only one of the following can happen to them a) Absorption b) Attenuation c) Refraction d) Reflection 14. Poynting vector signifies a) current density vector producing electrostatic field b) power density vector producing electromagnetic field c) current density vector producing electromagnetic field d) power density vector producing electrostatic field 15. An electric charge in uniform motion produces a) only electric field b) both electric and magnetic field c) only magnetic field d) neither electric nor magnetic field CELL: Page 3

4 16. Poynting vector gives the a) rate of energy flow b) Intensity of electric field c) Intensity of magnetic field d) direction of polarization 17. The intrinsic impedance of a lossy dielectric medium is given by a) jωμ ς b) jωε μ c) jωμ ς+jωε d) μ ε 18. Poynting vector gives the a) rate of energy flow b) Intensity of electric field c) Intensity of magnetic field d) direction of polarization 2 MARK QUESTIONS: 19. The electric field intensity associated with a plane wave travelling in a perfect dielectric medium is given by E x z, t = 10 cos (2π 10 7 t 0.1πz) V/m. The velocity of propagation of the wave and its direction are (ENG TRB ) a) m s ; positive x direction b) m s c) m s d) m s ; positive z direction ; positive y direction ; positive z direction 20. The dimensional formula for 1 2 ε 0E 2 is identical to that of (POLY TRB ) CELL: Page 4

5 b) 1 μ 2μ 0 2 0B 2 c) μ 2 0 2B a) B2 d) 1 2 B μ A metal sphere with 1 m radius and surface charge density of 10 Coulombs / m2 is enclosed in a cube of 10 m side. The total outward electric displacement normal to the surface of the cube is a 40 π Coulombs b 10 π Coulombs c 5 π Coulombs d) None of the above 22. The electric flux passing through a hemispherical surface of radius R placed in an electric field E with the axis parallel to the field is (POLY TRB-2012) a) EπR 2 b) 2πR 2 E c) 2πRE d) 2πR 3 E 23. The transmitting antenna of a radio station is mounted vertically. At a point 10km due north of the transmitter the peak electric field is 10 3 Vm 1.The magnitude of the radiated magnetic field is a) T b) T c) 10 3 T d) T 24. Electric charges q, q and -2q are placed at the corners of an equilateral triangle PQR of side L. The magnitude of electric dipole moment of the system is a) ql b) 2qL c) 4qL d) 3qL 25. Refractive index of glass is 1.5 then the wavelength of a beam of light with a frequency Hz in a glass (C = m s) a) 3μm b)2μm c)1μm d)10μm 26. Choose the correct boundary conditions for a dielectric sphere placed in a free space (TNSET-2012) CELL: Page 5

6 a) Normal component of E and tangential component of D are continuous b) Tangential component of E and normal component of D are continuous c) Tangential components of E and D are continuous d) Normal component of E and D are continuous 27. Match List I with List II and select the correct answer using the codes given below the lists List I List II P) E = 0 1) H. dl = J. da Q). D = ρ 2) E. dl = 0 R) B = μ 0 J 3) B. da = 0 S). B = 0 4) E. da = ρdv P Q R S a) b) c) d) The potential function V = x 2 y 2 + z satisfies a Poisson s equation c Gauss s law b) Laplace equation d Green s function CELL: Page 6

7 29. The equation cos 2 α V X 2 V + cos 2 β V Y 2 V + cos 2 γ V Z 2 V = 0 is called a Fresnel s law for phase velocity c Fresnel s law of diffraction b Fresnel s law of wave motion d) none of these 30. Sum of reflectivity and transmittivity is a) Equal to unity b) > unity c) < unity d) none of these ANSWER AT THE LAST PAGE: ங கள ம ச சனம அபச ள ஆச ர னப க & ட க க வ ர வ ரபன ப க ண ன ற K.S அக ந ன ல இரணந த னன டற வ ர! (Exclusively for PHYSICS) ம தல ட க க வக ப ப கள ஆபம ம TRB த ர ல ல ம ல ப பபண பபற ம ற ற ம TRB த ர ல ல அன பலம க க தப ச ர ரக பக ண ட நடத ப பட க மத. ஒவ பல ர UNIT க க ம SLIP TEST, UNIT TEST நடத ப பட ம. ஒவ பல ர UNIT க க ம 400 தகள ல கள பக ட க கப பட ம னந த ற ம த ர வ கள நடத ப பட ம. CELL: Page 7

8 1/3 rd PORTION TEST, HALF PORTION TEST நடத ப பட ம. பத த ம ழ த ர வ கள (TEN FULL TEST) நடத ப பட ம. ப த க 4000 ல ன க கரர பக ட த த ப ற ச அர க கப பட ம ஆம ஆண ட ம ல நரடபபற ம PG TRB ல ன க கள பக ட க கப பட ம ஆம ஆண ட ம ல நரடபபற ம ப ய படக ன க, DIET ல ர வ ர ரர ற ற ம பப ம ல கல ல ர தப ச ர ர (Polytechnic, DIET & Engineering TRB ) ல ன க கள பக ட க கப பட ம. TNPSC நடத பள ர இரங கரய ஆச ர ர (BT SCHOOL ASST ) ல ன க கர ல PG TRB SYLLABUS வ டன ப டர ப ரட ல ன க கள பக ட க கப பட ம. LECTURER TRB & ENGINEERING ASSISTANT PROFESSOR TRB, SCIENTIFIC ASSISTANT (TNPSC ), DEO (TNPSC MAINS PAPER -3), TNPSC SCHOOL ASSISTANT த ர வ கலக க தல ம இந ப ற ச லக ப ப ல கயந த பக ள லத TNSET, DIET பன பட ம. EDUCATION, PSYCHOLOGY & GK ல ற க ன க அன பலம க க ஆச ர ரக பக ண ட ப ற ச பக ட க கப பட ம CELL: Page 8

9 பரற ல ன க கரரத ர ம ப ர ம ப CUT COPY PAST பசய த TEST ரலக க ம TRB COACHING CENTRE அல எங கள கக ச ச ங டசன ர - பய ப ல ன க கர ல ப ற ச பபற ற TRB த ர ல ல பலற ம பபம K.S அக ந ன ல இர ல ர. Your time is limited, so don t waste it. ல ங க பட க கய ம! ப ற ச பபமய ம!! பலற ம ந ச சம!!! ம தல வக ப ப கள ஆபம ம K.S ACADEMY ச ப ப ர ர ட தட ர ல க தயஜ ப ல ட ங (STC ) டவ ன ல தல ஸ தடளன அர க ல தசயம -1 Answer key : அர ல ரன பன ப உரதல கர ல ன க யம அம ந த பச ன.... ர க க மள Q.NO ANS Q.NO ANS Q.NO ANS 1 A 11 D 21 A 2 B 12 C 22 A 3 C 13 B 23 B 4 D 14 B 24 D 5 B 15 C 25 B 6 D 16 A 26 B 7 C 17 C 27 C 8 A 18 A 28 B 9 B 19 B 29 A 10 C 20 A 30 A CELL: Page 9

K.S ACADEMY, SALEM-QUESTION PAPER PG TRB, POLYTECHNIC TRB & TNSET. COACHING CENTRE FOR PHYSICS Slip test- Spectroscopy

K.S ACADEMY, SALEM-QUESTION PAPER PG TRB, POLYTECHNIC TRB & TNSET. COACHING CENTRE FOR PHYSICS Slip test- Spectroscopy PG TRB, POLYTECHNIC TRB & TNSET COACHING CENTRE FOR PHYSICS Slip test- Spectroscopy Time:1Hour Marks: 40 ************************************************************************ Answer all the question: