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WAEC Physics

Page 19

Which of the following liquids has the highest surface tension?

a.

Soapy water

b.

Cold water

c.

Hot water

d.

Oily water

A transverse pulse of frequency 9Hz travels 4.5m in 0.6s. Calculate the wavelength of the pulse

a.

3.33m

b.

0.30m

c.

0.83m

d.

1.20m

A small amount of air is introduced into the vacuum above the mercury in a mercury barometer tube. The mercury level goes down because air molecules

a.

Heat the mercury and made it to expand

b.

Increase the pressure above the mercury

c.

Cool the mercury and made it to contract

d.

Decrease the pressure above the mercury

Which of the following processes is not a surface phenomenon?

a.

Condensation

b.

Evaporation

c.

Photo emission

d.

Thermionic emission

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