Heat Transfer - Jamb Physics Past Questions and Answers

Question 6:

• JAMB 1979

Which of the following statements is correct? Silvered walls of a vacuum flask are used to prevent

A. Heat loss due to conduction
B. Vacuum loss
C. Heat entry into the inner flask due to convection
D. Heat loss due to radiation
E. Heat loss due to convection

Question 7:

• JAMB 1981

Heat may be transferred by conduction, convection and radiation. By which of these methods does heat travel through vacuum?

A. Conduction only
B. Convection only
C. Radiation only
D. Non of these methods

Question 8:

• JAMB 1982

Which of the following statements is NOT true? Thermostats are used to control the temperature of

A. Pressure cookers
B. Laundry irons
C. Hot water storage tanks
D. Aquaria for tropical fish
E. Heated apartments

Question 9:

• JAMB 1982

A hot metal ball is suspended in the open air. As it cools it loses heat by

A. Conduction only
B. Convection only
C. Radiation only
D. Conduction and convection
E. Convection and evaporation

Question 10:

• JAMB 1984

If a solid changes directly into a gas when heat is applied the process is called

A. Vaporization
B. Evaporation
C. Sublimation
D. Ionization
E. Conversion