Physics WAEC Past Questions

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946

The velocity ratio of an inclined plane, inclines at an angle \(\theta\) to the horizontal can be expressed as

A. (sin \(\theta)^{-1}\)
B. \(\sin \theta\)
C. (cos \(\theta)^{-1}\)
D. \(\cos \theta\)

View Answer & Discuss (1) WAEC 2006

947

A block and tackle system has six pulleys. a force of 50N applied to it lifts a load of weight W. If the efficiency of the system is 40%, calculate W

A. 300N
B. 200N
C. 140N
D. 120N

View Answer & Discuss WAEC 2006

948

The sagging of overhead electrical cables is the consequence of

A. linear expansivity
B. superficial expansivity
C. cubic expansivity
D. conductivity

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949

The silvered surface in a vacuum flask reduces heat loos due to

A. conduction
B. convection
C. radiation
D. evaporation

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950

How long will it take to heat 3kg of water from 28^oC to 88^oC in an electric kettle taking 6a from a 220V supply? [specific heat capacity of water = 4180 J kg^-1K^-1]

A. 120s
B. 570s
C. 600s
D. 836s

View Answer & Discuss (3) WAEC 2006

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