An element that does not occur in nature but can be produced artificially is__________?
An element that does not occur in nature but can be produced artificially is__________?
A. Plutonium
B. Uranium
C. Radium
D. Thorium
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One mega ohm resistance is equal to ______?A. 106 ohm
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B. 24
C. 28
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Coke is made by heating coal in the absence of air at__________?A. 700 °C
B. 900 °C
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