Physics 1994 WAEC Past Questions

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Which of the following substances is not an insulator?

A. Aluminium
B. Glass
C. Plastic
D. Clay
E. Cork

View Answer & Discuss (2) WAEC 1994

When an atom loses or gains a charge, it becomes an

A. ion
B. an electron
C. a neutron
D. a proton
E. a deuteron

View Answer & Discuss (1) WAEC 1994

In 24 days a radioactive isotope decreases in mass from 64g to 2g. What is the half life of the radioactive material

A. 0.75 days
B. 2.58 days
C. 4 days
D. 4.80 days
E. 6 days

View Answer & Discuss (3) WAEC 1994

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The nucleon number and the proton number of a neutral atom of an element are 238 and 92 respectively. What is the number of neutrons in the atom?

A. 330
B. 238
C. 146
D. 119
E. 73

View Answer & Discuss (1) WAEC 1994

The wave function of a metal is 8.0 x \(10^{-19}\)J. Calculate the wavelength of its threshold frequency. (Speed of light in a vacuum = 3 x \(10^8ms^{-1}, Planck's constant = 6.6 \times 10^{-34}\)Js)

A. 0.8 x \(10^{-7}\)m
B. 1 x \(10^{-7}\)m
C. 2.3 x \(10^{-7}\)m
D. 3.8 x \(10^{-7}\)m
E. 12.4 x \(10^{-7}\)m

View Answer & Discuss (6) WAEC 1994

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