MCQs

Q261: Efficiency of a machine is not 100% because of?

• A) High temperature
• B) Overload
• C) Friction

Q262: Air can be liquefied by?

• A) Low pressure and high temperature
• B) High pressure and high temperature
• C) High pressure and low temperature

Q263: The material used in fluid oil extinguisher is?

• A) WaterSand
• B) Foam
• C) Gas

Q264: When hydrogen reacts with nitrogen, it forms?

• A) Methane
• B) Ammonia
• C) Carbon dioxide

Q265: If average pressure is 50 psi, the absolute pressure is?

• A) 14.7 psi
• B) 35.3 psi
• C) 64.7 psi

Q266: The melting point of ice at normal atmospheric pressure is ______?

• A) 0 °C
• B) 0 K
• C) 100 °C

Q267: The molecular weight of urea is?

• A) 50
• B) 60
• C) 70

Q268: The chemical formula of urea is?

• A) CH₄
• B) CO(NH₂)₂
• C) C₂H₅OH

Q269: Unit operation used in sugar industry is: A) Filtration B) Crystallization C) Evaporation D) All of these

• A) Filtration
• B) Crystallization
• C) All of these

Q270: The separation of substances in distillation depends upon?

• A) Melting points
• B) Densities
• C) Boiling points