Physics 1998 WAEC Past Questions

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Which of the following are both mechanical and transverse?

A. infra-red rays
B. gamma rays
C. sound waves
D. water waves
E. micro waves

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An electromagnetic wave of frequency 5.0 x 10¹⁴Hz, is incident on the surface of water of refractive index \(\frac{4}{3}\). Taking the speed of the wave in air as 3.0 x 10⁸ms^-1, calculate the wavelength of the wave in water.

A. 2.2 x 10^-6m
B. 1.7 x 10^-7m
C. 8.0 x 10^-7m
D. 6.0 x 10^-7m
E. 4.5 x 10^-7m

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The gravitational force of the moon is one-sixth that of the earth. If a body weighs 6.0N on the moon. Calculate its weight on the earth

A. 36.0N
B. 12.0N
C. 6.0N
D. 2.0N
E. 1.0N

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In the electrical method of magnetisation, the polarity of the magnet depends on the

A. amount of current passed
B. direction of current
C. magnetic material used
D. size of the magnetic material
E. orientation of the magnetic material in space

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A cell of e.m.f. 1.5v is connected in series with a resistor of 3\(\Omega\). A high resistance voltmeter connected across the cell registers only 0.9v. Calculate the internal resistance of the cell

A. 5.0\(\Omega\)
B. 4.5\(\Omega\)
C. 2.4\(\Omega\)
D. 2.0\(\Omega\)
E. 1.8\(\Omega\)

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