Metals which react with steam only when they are red-hot include
copper
sodium
calcium
gold
iron
Correct answer is E
No explanation has been provided for this answer.
Which of the following insect groups readily attacks dry grains?
Boring insects
Biting insects
Sucking insects
Piercing insects
Correct answer is A
No explanation has been provided for this answer.
The function of limestone in the extraction of iron in the blast furnace is
removal of the earthly impurities
decomposition of the iron ore
conversion of iron (lll) to iron (ll) compounds
generation of heat for the process
conversion of coke to carbon(ll)oxide
Correct answer is A
No explanation has been provided for this answer.
Which of the following is an alloy of mercury?
Stainless steel
Soft solder
Coinage bronze
Amalgam
Duralumin
Correct answer is D
No explanation has been provided for this answer.
Which of the following is a symptom of black-pod disease of cacao?
Diseases leaves fall prematurely
Characteristic swellings appear on young stems and roots
Small brown spot first appears on the pod
Veins of diseased leaves become red in colour
Correct answer is C
No explanation has been provided for this answer.