Physics 2004 WAEC Past Questions

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An atom is normally electrically neutral because the

A. number of electrons is equal to the number of protons
B. number of electrons is equal to the number of neutrons
C. number of protons is equal to the number of neutrons
D. electrons of the atom are buried deeply in the nucleus

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In which of the following devices is the principle of photoelectric effect not applicable?

A. close-circuit television camera
B. burglar alarm
C. solar cells
D. periscope

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Which of the following statements about X-rays is not correct? They

A. are electromagnetic waves
B. can be used to study crystal lattice
C. can destroy living cells
D. are produced from the nucleus of an atom

View Answer & Discuss (1) WAEC 2004

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A radioactive substance has a half-life of 3 days. If a mass of 1.55g of this substance is left after decaying for 15 days, determine the original value of the mass

A. 49.6g
B. 37.2g
C. 24.8g
D. 12.4g

View Answer & Discuss (2) WAEC 2004

Which of the following representations is correct for an atom X with 28 electrons and 30 neutrons?

A. \(^{30}_{28} X\)
B. \(^{28}_{30} X\)
C. \(^{58}_{30} X\)
D. \(^{58}_{28} X\)

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Physics 2004 WAEC Past Questions

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