WAEC Physics Past Questions & Answers - Page 207

1,031.

A periodic pulse travels a distance of 20.0m in 1.00s. If its frequency is 2.0 x 10³Hz. Calculate the wavelength.

A.

1.0 x 10^-3m

B.

1.0 x 10^-2m

C.

2.0 x 10^-2m

D.

1.0 x 10²m

View answer & explanation

Correct answer is B

No explanation has been provided for this answer.

1,032.

The temperature at which the saturated vapour pressure of a liquid is equal to the external atmospheric pressure is known as its

A.

dew point

B.

boiling point

C.

lower fixed point

D.

tripple point

View answer & explanation

Correct answer is B

No explanation has been provided for this answer.

1,033.

The mass of water vapour in a given volume of air is 0.05g at 20^oC, while the mass of water vapour required to saturate it at the same temperature is 0.15g. Calculate the relative humidity of the air

A.

3.33%

B.

5.55%

C.

33.33%

D.

55.55%

View answer & explanation

Correct answer is C

No explanation has been provided for this answer.

1,034.

A piece of metal of mass 50g is cooled from 80^oC to 20^oC. Calculate the amount of heat lost. (specific heat capacity of the material of metal = 450Jkg^-1K^-1)

A.

4.50 x 10³J

B.

2.25 x 10³J

C.

1.80 x 10³J

D.

1.35 x 10³J

View answer & explanation

Correct answer is D

No explanation has been provided for this answer.

1,035.

The volume and pressure of a given mass of gas at 27^oC are 76cm³ and 80cm of mercury respectively. Calculate the volume at s.t.p

A.

36.2cm³

B.

72.8cm³

C.

100.0cm³

D.

808.9cm³

View answer & explanation

Correct answer is B

No explanation has been provided for this answer.

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