Heat Transfer - Jamb Physics Past Questions and Answers

Question 21:

• JAMB 2002

The radiator of a motor car is cooled by

A. Radiation
B. Conduction
C. Convection
D. Radiation and conduction

Question 22:

• JAMB 2004

Tea pots are often silver-coated to prevent heat loss by

A. Conduction only
B. Convention only
C. Convection and conduction
D. Radiation only

Question 23:

• JAMB 2005

When very hot water is poured into two identical thin and thick glass tumblers in equal volumes, the thick one cracks because?

A. Of the even expansion of glass
B. Glass is a crystal
C. Glass is a good conductor of heat
D. Of the uneven expansion of gass

Question 24:

• JAMB 2006

The thermos flask is designed to?

A. Prevent heat loss or gain by conduction, convection amd radiation
B. Store hot tea or water
C. Prevent heat gain by conduction, convection and radiation
D. Prevent head lost conduction, convention and radiation

Question 25:

• JAMB 2007

The blade of a hoe feel colder to touch in the morning than the wooden handle because the

A. Handle is a better conductor of heat than blade
B. Handle contains stored energy in form of heat
C. Blade is a better conductor of heat than the handle
D. Blade is placed at a lower temperature than the heat