Which of the following is the conductor of nonmetal electricity?
(A) graphite
(B) Copper
(C) Sulfur
(D) diamond
Is zinc ore?
(A) zinc blade
(B) Bauxite
(C) sodium chloride
(D) Sinawar
What percentage of carbon is in steel?
(A) 3%
(B) 4%
(C) 2%
(D) 5%
Which metal starts floating when put in water?
(A) calcium
(B) Nickel
(C) Magnesium
(D) Potassium
What is an oxidation-reduction reaction called?
(A) endothermic reaction
(B) Redox reaction
(C) precipitation reaction
(D) exothermic reaction
In the presence of sunlight, plants prepare their food (glucose) with CO2 and water. What is this reaction?
(A) Displacement
(B) Disintegration
(C) Photochemical
(D) precipitation
Photochemical is the process by which plants use sunlight, water, and carbon dioxide to create oxygen and energy in the form of sugar.
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