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Heat & Thermodynamics - Convection MCQs

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Heat & Thermodynamics - Convection

Heat & Thermodynamics - Convection MCQs With Answers

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CSS - PMS - CCE - PCS - General Science Heat & Thermodynamics - Convection
What is forced convection?
A. Radiation from the Sun
B. Convection enhanced by a fan, pump or other external mechanism
C. Conduction in copper only
D. Convection without any fluid
Correct Answer: B
Fans and pumps move fluid and increase convective heat transfer.
CSS - PMS - CCE - PCS - General Science Heat & Thermodynamics - Convection
Sea breezes are an example of what heat-transfer process?
A. Refraction
B. Nuclear fission
C. Convection
D. Conduction only
Correct Answer: C
Unequal heating of land and sea drives convective air circulation.
CSS - PMS - CCE - PCS - General Science Heat & Thermodynamics - Convection
What is a convection current?
A. Circulating fluid motion driven by temperature and density differences
B. An electric current only
C. A light ray
D. A chemical bond
Correct Answer: A
Rising warm fluid and sinking cool fluid can form circulation cells.
CSS - PMS - CCE - PCS - General Science Heat & Thermodynamics - Convection
In which materials does convection occur most readily?
A. Metals only
B. Rigid solids only
C. Liquids and gases
D. Vacuum only
Correct Answer: C
Convection requires bulk fluid flow.
CSS - PMS - CCE - PCS - General Science Heat & Thermodynamics - Convection
What causes natural convection?
A. Sound waves
B. Magnetic fields only
C. Radioactivity
D. Density differences produced by temperature differences
Correct Answer: D
Warmer fluid often becomes less dense and rises while cooler fluid sinks.
CSS - PMS - CCE - PCS - General Science Heat & Thermodynamics - Convection
What is convection?
A. Heat transfer only by radiation
B. No energy transfer
C. Heat transfer only through solids
D. Heat transfer by bulk motion of a fluid
Correct Answer: D
Convection occurs in liquids and gases through fluid motion.
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