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3 questions
Aluminium does not oxidise in air readily because
It is high in the electrochemical series
It is low in the electrochemical series
The metal does not combine with oxygen
The metal is covered with a layer of oxide which does not rub off
What is the final product of photosynthesis?
Protein
Fat
Starch
Mineral salt
Where should an object be placed in front of a convex lens to get a real image of the size of the object
At the principal focus of the lens
At twice the focal length
At infinity
Between the optical center of the lens and its principal focus
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