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Transcript
Quiz LEVEL 1 1.The circumstance under which line charge can be treated as point charge is_ A)E field is being measured at a distance which is much larger than the dimensions of the line B)E field is measured on the line charge C)it can never be treated so D)None of the above Ans:A 2.In case of dipole the E field at a point is ___ Ans:A A)inversely proportional to cube of distance B)inversely proportional to square of distance C)inversely proportional to distance D)inversely proportional to fourth power of distance 3.E field due to a system of quadrupole is Ans:D A)inversely proportional to cube of distance B)inversely proportional to square of distance C)inversely proportional to distance D)inversely proportional to fifth power of distance 4.Electric flux lines : Ans:C A)emanate from positive charge B)converge on negative charge C)both the above D)none of the above 5. Electric fields due to non uniform distributions cannot be obtained using Gauss’s law Ans:B A)True B)False C)depends on non uniformity D)None of the above 6.Which of the following represents a symmetric E field surface for uniformly distributed volume charge: Ans:A A)yes B)no C)insufficient data D)none of the above 7. At a distance comparable to the dimensions of the surface charge E field due to it is Ans:B A)independent of the distance C)cannot be determined B)dependent on distance D)none of the above 8. Electric Potential inside the perfect spherical conductor is ____________ proportional to the distance from the centre. Ans:D A)Directly B)Inversely C)Square of Inverse D)Constant 9.The unit of polarization is Ans:B A)nC/m B)nC/m2 C)nC/m3 D)nCm2 LEVEL2 1.The intensity of electric field between two parallel charged plates is 5N per coulomb then the fore exerted on a 2.0 coulomb charge placed between the plates is ___ Ans:D A)0.40 B)2.5 C)7 D)10 2. A long charged cylinder of linear charged density l is surrounded by a hollow co-axial conducting cylinder. What is the electric field in the space between the two cylinders?Ans:A A) λ/(2 π ε0 r ) B) λ/(2 π ε0 r2 ) C) λ/( π ε0 r ) C)None 3.Which is not an example of convection current? Ans D (a) A moving charged belt (b) Electronic movement in a vacuum tube (c) An electron beam in a television tube (d) Electric current flowing in a copper wire 4. Sea water has εr = 80. Its permittivity is (a) 81 (b) 79 Ans:D (c) 5.162 X 10-1 uF/m (d) 7.074 X 10-10F/m 5. The relaxation time of mica (σ = 10 -15mhos/m εr = 6) is Ans:C (a) 5 X 10-10 s (b) 10-6s (c) 15 hours (d) 10 hours 6. The charge 10 -4e-3t ( C is removed from a sphere through a wire. Find the current in the wire at t= 0 and t = 2.5 s. A) 4mA Ans:D B) 8mA C)12mA D)None 7. A coil is made of 150 turns of copper wire wound on a cylindrical core. If the mean radius of the turns is 6.5 mm and the diameter of the wire is 0.4 mm, calculate the resistance of the coil. Ans:D A)2.75Ω B) 2.78Ω C) 2.73Ω D)None LEVEL 3 1.Dielectric breakdown is said to occurred when: Ans:B A)Dielectric has broken down due to excessive voltage B)Dielectric starts conducting C)Dielectric stops conducting D)None of these 2.When the ratio of electric field to polarization is divided by ε o. It is called as Ans:C A)Relative permittivity B)Dielectric strength C)Electric susceptibility D)None of the above 3. The electric susceptibility Xe ( = εr - 1) of a dielectric measures A) the sensitivity of the material to an electric field. B) the sensitivity of the material to a magnetic field. C)Both D)None 4.For conductors Ans:A Ans:A A) σ>>1, ε r = 1 C) ) σ>>1, ε r ≥ 1 5. For conductors Ans:D A) σ>>1, ε r = 1 C) ) σ>>1, ε r ≥ 1 B) ) σ<<1, ε r ≥ 1 D) ) σ<<1, ε r = 1 B) ) σ<<1, ε r ≥ 1 D) ) σ<<1, ε r = 1 When a steady potential difference is applied across the ends of a conducting wire 6. Which one is correct Ans:D a) All electrons move with a constant velocity. b) All electrons move with a constant acceleration. A) a B)b C)both D)none 7. Which one is correct Ans:A a) The random electronic motion will, on the average, be equivalent to a constant velocity of each electron. b) The random electronic motion will, on the average, be equivalent to a nonzero constant acceleration of each electron. A) a B)b C)both D)none