Physics WAEC Past Questions

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401

Which of the following statements about evaporation is not correct?

A. The rate of evaporation of a liquid varies with temperature
B. The molecules of an evaporating liquid have an average speed
C. Evaporation occurs when faster molecules escape from the surface of a liquid
D. Evaporation takes place inside a liquid.

View Answer & Discuss (1) WAEC 1999

402

Calculate the power rating of an immersion heater used for 10 minutes to increase the temperature of 10kg of water by 15K. (Specific heat capacity of water = 4200 J l-1K^-1)

A. 1,050W
B. 16,800W
C. 18,060W
D. 20,160W

View Answer & Discuss (4) WAEC 1999

403

A ray of light is incident on 'a plane mirror at an angle of 20o. This mirror is rotated through, twice this angle, In this new position the angle between the incident ray and the reflected ray is