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MCQs

Total Questions : 5013 | Page 8 of 502 pages
Question 71. The speed of sound will be maximum in
  1.    Vacuum
  2.    Metal
  3.    Air
  4.    Water
 Discuss Question
Answer: Option B. -> Metal
Question 72. The amount of water evaporated in kg per kg of fuel burnt in a boiler is called the __________ of a boiler.
  1.    Evaporative capacity
  2.    Evaporation efficiency
  3.    Thermal efficiency
  4.    Steam load
 Discuss Question
Answer: Option A. -> Evaporative capacity
Question 73. Steel is welded using the __________ flame.
  1.    Carburising
  2.    Neutral
  3.    Oxidising
  4.    All of the above
 Discuss Question
Answer: Option B. -> Neutral
Question 74. Two stroke engine compared to a four stroke engine has
  1.    Higher efficiency
  2.    Less fuel consumption
  3.    Higher power to weight ratio
  4.    Lower initial cost
 Discuss Question
Answer: Option C. -> Higher power to weight ratio
Question 75. Reduction reaction involves the
  1.    Loss of electrons
  2.    Increase in oxidation number
  3.    Gain of electrons
  4.    Addition of oxygen
 Discuss Question
Answer: Option C. -> Gain of electrons
Question 76. For a spontaneous natural process at constant temperature and pressure, the free energy of the system always
  1.    Increases
  2.    Decreases
  3.    Remains constant
  4.    Increases to a maximum before decreasing
 Discuss Question
Answer: Option A. -> Increases
Question 77. Nickel and __________ are the alloying element added in steel to increase its toughness.
  1.    Molybdenum
  2.    Chromium
  3.    Vanadium
  4.    Silicon
 Discuss Question
Answer: Option D. -> Silicon
Question 78. Nitriding of a steel part does not increase its
  1.    Grain size
  2.    Fatigue limit
  3.    Surface hardness
  4.    Wear resistance
 Discuss Question
Answer: Option A. -> Grain size
Question 79. The heat of neutralisation remains constant, when there is a reaction between dilute solutions of strong
  1.    Base and strong acid
  2.    Base and weak acid
  3.    Acid and weak base
  4.    None of these
 Discuss Question
Answer: Option A. -> Base and strong acid
Question 80. __________ has a negative co-efficient of linear expansion.
  1.    Iron
  2.    Copper
  3.    Rubber
  4.    Nickel
 Discuss Question
Answer: Option B. -> Copper

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