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PHYSICS MCQs

Total Questions : 3767 | Page 14 of 377 pages
Question 131. Refrigeration is a process which
  1.    Kills bacteria
  2.    Slows down the bacterial growth
  3.    Inactivates the bacteria
  4.    Plasmolyses the bacteria
 Discuss Question
Answer: Option B. -> Slows down the bacterial growth
Question 132. Blowing Air with open pipe is an example of :
  1.    Isothermal process
  2.    Isochroric process
  3.    Isobaric process
  4.    Adiabatic process
 Discuss Question
Answer: Option C. -> Isobaric process
Question 133. Which of the following is not reversible?
  1.    Joule effect
  2.    Peltier effect
  3.    Seebeck effect
  4.    Thomson effect
 Discuss Question
Answer: Option A. -> Joule effect
Question 134. In a diesel engine the high temperature needed to ignite the fuel is achieved by
  1.    Using heat from exhaust
  2.    The battery
  3.    Compressing air in the cylinders
  4.    An electrical spark
 Discuss Question
Answer: Option C. -> Compressing air in the cylinders
Question 135. Heat transfer horizontally within the atmosphere is called
  1.    Conduction
  2.    Convection
  3.    Absorption
  4.    Advection
 Discuss Question
Answer: Option D. -> Advection
Question 136. ________ states that internal energy is a function of state and the increase in internal energy is equal to the sum of the heat supplied to system and work done by the system.
  1.    First law of thermodynamics
  2.    Hooke's Law
  3.    The coulomb's law
  4.    Faraday's Law
 Discuss Question
Answer: Option A. -> First law of thermodynamics
Question 137. Which phase change is an example of an exothermic process?
  1.    Liquid to Solid
  2.    Gas to Solid
  3.    Gas to Liquid
  4.    All the above
 Discuss Question
Answer: Option D. -> All the above
Question 138. The velocity of heat radiation in vacuum is
  1.    Equal to that of light
  2.    Less than that of light
  3.    Greater than that of light
  4.    Equal to that of sound
 Discuss Question
Answer: Option A. -> Equal to that of light
Question 139. In a Carnot engine when heat is taken from the source, its temperature
  1.    Remains constant
  2.    Decreases
  3.    Increases
  4.    Decreases and then remains constant
 Discuss Question
Answer: Option A. -> Remains constant
Question 140. Even after sunset, the air near the Earth's surface continue to receive heat due to
  1.    Insolation
  2.    Terrestrial Radiation
  3.    Conduction
  4.    Convection
 Discuss Question
Answer: Option B. -> Terrestrial Radiation

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