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3641

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

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

View Answer & Discuss JAMB 2017

3642

A man walks 1km due east and then 1 km due north His displacement?

A. √2km N 45°E
B. 1km N 30°E
C. 1km N 15°E
D. √2km N 60°E

View Answer & Discuss (4) JAMB 2018

3643

The density of 400cm\(^3\) of palm oil was 0.9gcm-3 before frying. If the density of the oil was 0.6gcm-3 after frying, assuming no loss of oil due to spilling, its new volume was?

A. 1360cm\(^3\)
B. 600cm\(^3\)
C. 240cm\(^3\)
D. 8000m\(^3\)

View Answer & Discuss (6) JAMB 2018

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3644

Which of the following is true of an electrical charge?

A. Positive charge means deficit electrons
B. Negative charge means excess of electrons
C. electric current means movement of electrons
D. All of the above

View Answer & Discuss (1) JAMB 2017

3645

Natural radioactivity consists of the emission of

A. α- particles and β-rays
B. α- particles and X-rays
C. α- particles, β - rays and y-rays
D. γ- rays and X-rays

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