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MCQs

Total Questions : 47 | Page 5 of 5 pages
Question 41. Two gases separated by an impermeable but movable partition are allowed to freely exchange
energy. At equilibrium, the two sides will have the same
  1.    pressure and temperature
  2.    volume and temperature
  3.    pressure and volume
  4.    volume and energy
 Discuss Question
Answer: Option A. -> pressure and temperature


-NA-


Question 42. The isospin (I) and baryon number (B) of the up quark is
  1.    I=1, B=1
  2.    I=1, B=1/3
  3.    I=1/2, B=1
  4.    I=1/2, B=1/3
 Discuss Question
Answer: Option D. -> I=1/2, B=1/3


-NA-


Question 43. The decay process n → p+ + e- + v-e violates
  1.    baryon number
  2.    lepton number
  3.    isospin
  4.    strangeness
 Discuss Question
Answer: Option C. -> isospin


-NA-


Question 44. The spacing between vibrational energy levels in CO molecule is found to be 8.44 * 10-2 eV. Given that the reduced mass of CO is 1.14 * 10-26 kg, Planck's constant is 6.626 * 10-34 Js and 1eV = 1.6 * 10-19 J. The force constant of the bond in CO molecule is

  1.    1.87 N/m
  2.    18.7 N/m
  3.    187 N/m
  4.    1870 N/m
 Discuss Question
Answer: Option C. -> 187 N/m


-NA-


Question 45. A proton is confined to a cubic box, whose sides have length 10-12 m. What is the minimum
kinetic energy of the proton? The mass of proton is 1.67 * 10-27 kg and Planck's constant is
6.63 * 10-34 Js.
  1.    1.1 * 10-17 J
  2.    3.3 * 10-17 J
  3.    9.9 * 10-17 J
  4.    6.6 * 10-17 J
 Discuss Question
Answer: Option C. -> 9.9 * 10-17 J


-NA-


Question 46. For the function f(z) = 16z/(z+3)(z-1)2, the residue at the pole z = 1 is (your answer should be an integer) ___________.
  1.    3
  2.    4
  3.    5
  4.    6
 Discuss Question
Answer: Option A. -> 3


-NA-


Question 47. The total energy of an ionic solid is given by an expression E = - α e2/4πϵ0r + B/r9 where α is Madelung
constant, r is the distance between the nearest neighbours in the crystal and B is a constant. If r0 is the equilibrium separation between the nearest neighbours then the value of B is
  1.    (α e2r08)/(36πϵ0)
  2.    (α e2r08)/(4πϵ0)
  3.    (2α e2r010)/(9πϵ0)
  4.    (α e2r010)/(36πϵ0)
 Discuss Question
Answer: Option A. -> (α e2r08)/(36πϵ0)


-NA-


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