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1) When a salt is mixed with water it forms a a. solution b. medicines c. food additive d. preserver
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2) To initiate a material for burning we need a. heat b. water c. flammable liquid d. sunlight
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3) Serious damages, injuries and even deaths are caused by a. fire b. oil c. gas d. carbon
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4) During burning process, energy is released in form of a. light energy b. heat energy c. both a and b d. chemical energy
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5) Changes in matter takes place a. in day b. noon c. night d. all the time
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6) When a fruit salt is mixed with water we observe a. bubbles of gas b. no visible change c. salty taste d. blue color
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7) On heating sugar gives off a. carbon(black solid) b. water vapors c. both a and b d. carbon dioxide
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8) When a candle is lit solid wax melts into a. liquid b. vapor c. gas d. molten
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9) In case of chocolate the heating lead to changes which are a. reversible b. irreversible c. same d. constant
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10) Substances which burn in air rapidly and catch fire easily are called a. flammable b. inflammable c. both a and b d. not flammable
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11) The changes which cannot be returned back to their original products are a. reversible b. irreversible c. same d. constant
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12) When a material is burnt it forms new material by using gas from atmosphere called a. oxygen b. nitrogen c. carbonmono oxide d. carbon dioxide
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13) The changes occur in egg after heating process are a. reversible b. irreversible c. same d. constant
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