Physics 2002 WAEC Past Questions

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A block and tackle system has 6 pulleys. If the efficiency of the machine is 60%, determine its mechanical advantages

A. 12.0
B. 10.0
C. 3.6
D. 1.8

View Answer & Discuss (6) WAEC 2002

Which of the following actions will improve the efficiency of the pulley system?

A. reducing the mass of the pulley
B. increasing the friction force between the string and the pulley
C. increasing the mass per unit length of the string of the pulley
D. increasing the mass of the pulley

View Answer & Discuss (3) WAEC 2002

The ice and steam points of a certain thermometer are -20° and 100° respectively. Calculate the Celsius temperature corresponding to 70° on the thermometer

A. 84.0^o
B. 75.0^o
C. 64.0^o
D. 58.0^o

View Answer & Discuss (11) WAEC 2002

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The silver coating on the inside of a vacuum flask reduces heat loss by

A. conduction
B. radiation
C. condensation
D. convention

View Answer & Discuss WAEC 2002

Water of mass 120g at 50oC is added to 200g of water at 10oC and the mixture is well stirred. Calculate the temperature of the mixture. [Neglect heat losses to the surrounding]

A. 60^oC
B. 40^oC
C. 25^oC
D. 10^oC

View Answer & Discuss (6) WAEC 2002

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