Which of the following is an example of a chemical reaction...? Mcqs

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Which of the following is an example of a chemical reaction...?

(A) Water freezing into ice
(B) Sand settling to the bottom of a pool

(C) Leaves changing colors in the fall
(D) A rock rolling down a hill

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All of the following substances are crystalline except_____________...?

(A) Ice
(B) Diamond

(C) Sucrose
(D) Plastic

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The Tree sends down roots from its branches to the soil is known as:___________...?

(A) Oak
(B) Pine

(C) Banyan
(D) Palm

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Which of the following vitamins is involved in collagen production...?

(A) Vitamin A
(B) Vitamin B12

(C) Vitamin C
(D) None of these

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Matter can change from one form into another by...?

(A) Heating
(B) Cooling

(C) Both A and B
(D) None

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Anything that occupies space and has mass is called...?

(A) Mass
(B) Force

(C) Volume
(D) Matter

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Cataract is a disease of ________...?

(A) Eyes
(B) Throat

(C) Lungs
(D) Circulatory system

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Solution is a kind of...?

(A) Mixture
(B) Element

(C) Compound
(D) None

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Animals that eat only plants are known as...?

(A) Carnivores
(B) Omnivores

(C) Herbivores
(D) None of these

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The half life of a radioactive element is 8-days. How long it take to reduce it from 10 mg to 5 mg...?

(A) 4 days
(B) 12 days

(C) 16 days
(D) 8 days

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