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MCQs

Total Questions : 194 | Page 4 of 20 pages
Question 31. On burning, hydrogen is changed into
  1.    hydroxides
  2.    water vapors
  3.    dilute acids
  4.    hydrogen gas
 Discuss Question
Answer: Option B. -> water vapors
Answer: (b).water vapors
Question 32. An efficient source of electricity production is
  1.    to combine hydrogen and oxygen to form water
  2.    to drive generators through steam
  3.    to combine nitrogen with hydrogen
  4.    both a and b
 Discuss Question
Answer: Option A. -> to combine hydrogen and oxygen to form water
Answer: (a).to combine hydrogen and oxygen to form water
Question 33. Incorrect statement is: An exothermic reaction,
  1.    forms a compound which gives out heat while being formed
  2.    contains products that are very stable
  3.    resulting in overall enthalpy change zero
  4.    gives overall negative enthalpy.
 Discuss Question
Answer: Option B. -> contains products that are very stable
Answer: (b).contains products that are very stable
Question 34. Methane (CH₄) is better fuel than Coal gas because
  1.    it is endothermic
  2.    it is exothermic
  3.    it gives off more heat than coal gas
  4.    it requires very little oxygen to burn
 Discuss Question
Answer: Option C. -> it gives off more heat than coal gas
Answer: (c).it gives off more heat than coal gas
Question 35. Exothermic reactions take place when
  1.    energy given out in making bonds is less than the energy taken in for breaking bonds
  2.    energy given out in making bonds is more than the energy taken in for breaking bonds
  3.    energy given out in making bonds is equal to the energy taken in for breaking bonds
  4.    the final energy content of products is lower
 Discuss Question
Answer: Option B. -> energy given out in making bonds is more than the energy taken in for breaking bonds
Answer: (b).energy given out in making bonds is more than the energy taken in for breaking bonds
Question 36. The energy can neither be created nor destroyed but can be changed from one form to the other is
  1.    Law of conservation of energy
  2.    Law of definite proportions
  3.    Hess's law
  4.    None of above
 Discuss Question
Answer: Option A. -> Law of conservation of energy
Answer: (a).Law of conservation of energy
Question 37. Law of conservation of energy is called same as
  1.    First law of thermodynamics
  2.    Second law of thermodynamics
  3.    First law of motion
  4.    Second law of motion
 Discuss Question
Answer: Option A. -> First law of thermodynamics
Answer: (a).First law of thermodynamics
Question 38. When the temperature of the system remains constant, the graph shows
  1.    Pouring temperature
  2.    Thermal arrest
  3.    Slanted area
  4.    Isotherm
 Discuss Question
Answer: Option B. -> Thermal arrest
Answer: (b).Thermal arrest
Question 39. The amount of energy required to note the phase change is
  1.    Latent heat
  2.    Internal energy
  3.    Kinetic energy
  4.    Potential energy
 Discuss Question
Answer: Option A. -> Latent heat
Answer: (a).Latent heat
Question 40. The slope of the cooling curve at any point is
  1.    Heating rate
  2.    Cooling rate
  3.    Reaction rate
  4.    heat energy
 Discuss Question
Answer: Option B. -> Cooling rate
Answer: (b).Cooling rate

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