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Physics Past Questions and Answers

Waec Physics Questions

Question 1981:

A motorcycle starting from rest is uniformly accelerated such that its velocity in 10s is 72kmhr\(^{-1}\). What is its acceleration?

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A 108ms\(^2\)
B 86ms\(^2\)
C 4ms\(^2\)
D 2ms\(^2\)

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Question 1982:

The temperature of an object is raised by 120°C. The resulting increase in its absolute temperature is

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A 50K
B 120 K
C 200K
D 393K

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Question 1983:

Which of the following statements about the motion of a simple pendulum is true?

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A It is a simple harmonic motion when the angle of displacement is large
B It passes the equilibrium position with minimum speed
C It possesses maximum kinetic energy at the extreme positions
D Lt swings faster at the poles than at the equator

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Question 1984:

An electron of mass m and charge e moves in a circular path in a magnetic field of flux density B. How long does it take to complete one orbit?

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A \(\frac{2me}{B\pi}\)
B \(\frac{2B}{me\pi}\)
C \(\frac{2\pi m}{Be}\)
D \(\frac{Be}{2 \pi m}\)

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Question 1985:

Which of the following statements about photoelectrons is correct?

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A A faint green light produces photoelectrons with less kinetic energy than a bright red light
B A red light releases a smaller number of electrons than a green light
C A faint green light produces photoelectrons with greater kinetic energy than a bright red light
D A red light produces more photoelectrons than a green light

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