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MCQs

Total Questions : 500 | Page 49 of 50 pages
Question 481. 7. Inside a hollow conducting sphere
  1.    electric field is zero
  2.    electric field is an non-zero constant
  3.    electric field changes with the magnitude of the change given to the conductor
  4.    electric field changes with distance from the centre of the sphere
 Discuss Question
Answer: Option A. -> electric field is zero
Question 482. 9. A circuit with a resistor, inductor and capacitor in series is resonant of fo Hz. If all the component values are now doubled, the new resonant frequency is
  1.    2f0
  2.    still f
  3.    f0/4
  4.    f012
 Discuss Question
Answer: Option D. -> f012
Question 483. 1.  When the plate area of a parallel plate capacitor is increased keeping the capacitor voltage constant, the force between the plates.
  1.    increase
  2.    decreses
  3.    remains constant
  4.    may increase or decrease depending on the metal making up the plates.
 Discuss Question
Answer: Option A. -> increase
Question 484. 2. An electron with velocity u is placed in an electric field E and magnetic field B. The force experienced by the electron is given by
  1.    ?eE
  2.    ?eu x B
  3.    ?e(u x E + B)
  4.    ?e(E +11 x B)
 Discuss Question
Answer: Option A. -> ?eE
Question 485. 3. A dielectric material in an electric field gets polarized. If the polarization is non-uniform, then there would be accumulation of
  1.    bound charge only on the surface
  2.    bound charge only within the material
  3.    bound charge within the material as well as on the surface
  4.    free charge on the surface of the dielectric
 Discuss Question
Answer: Option C. -> bound charge within the material as well as on the surface
Question 486. 4. An infinitely long dielectric cylinder of relative permitivity, E r is placed in air in a uniform electric field of magnitude E directed perpendicular to its axis. The stress withing the cylinder is
  1.    E1 + Er
  2.    1 + 2E
  3.    2 + er
  4.    2er
 Discuss Question
Answer: Option A. -> E1 + Er
Question 487. 6.  When the wave vector of an electron in a metal is equal to half the reciprocal vecor values, the electron wave is
  1.    a travelling wave
  2.    a standing wave
  3.    an exponentially decaying wave
  4.    an exponentially rising wave
 Discuss Question
Answer: Option C. -> an exponentially decaying wave
Question 488. 7.  When a piece of metal has a temperature gradient between its two ends, an e.m.f. is observed to exist between those ends. This is known as
  1.    Peltier effect
  2.    Seebeck effect
  3.    Thomson effect
  4.    Hall effect
 Discuss Question
Answer: Option B. -> Seebeck effect
Question 489. 5.  Consider the following statements in respect of energy bonds in a solid :1. Energy bands at high energy have more width than those bands at low energy.2. Low energy bands cprrespond to valence electrons3. There are always son* energy bands that are not filled. Which of these statements is/are correct?
  1.    1, 2 and 3
  2.    1 and 2
  3.    only 2
  4.    1 and 3
 Discuss Question
Answer: Option D. -> 1 and 3
Question 490. 8.  Two semiconductor materials A and B have carrier concentration values nA = 1 X 102Im-s and n = 4 X 1021M-3. Hall coefficients of the materials, RA and RB are in the ratio
  1.    1 :2
  2.    2 : 1
  3.    1 :4
  4.    4 : 1
 Discuss Question
Answer: Option D. -> 4 : 1

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