Science Practice Quiz 172

Q1.What defines a chemical change?

A. A change in which only the physical state of a substance alters B. A change in which one or more new substances are formed C. A change that can be easily reversed by simple physical methods D. A change that only involves a change in the shape or size of an object

Q2.Which of the following is an example of a chemical change mentioned in the text?

A. Melting of ice into water B. Digestion of food in our body C. Boiling of water to produce steam D. Tearing a piece of paper into smaller bits

Q3.In addition to the formation of new products, which of the following may accompany a chemical change?

A. A significant increase in the overall mass of the substances B. Production of sound C. A decrease in the total volume of the reactants D. Only absorption of heat, never release

Q4.Which of the following processes is explicitly identified as a chemical change in the provided text?

A. Dissolving sugar in water B. Burning of coal C. Evaporation of water D. Magnetization of an iron piece

Q5.When copper sulphate reacts with iron, what are the new substances formed as a result of this chemical change?

A. Copper oxide and iron B. Iron sulphate and copper C. Copper sulphide and iron D. Iron chloride and sulphur

Q6.In the reaction between vinegar and baking soda, which gas is produced that turns lime water milky?

A. Oxygen B. Hydrogen C. Carbon dioxide D. Nitrogen

Q7.What is always produced when any substance undergoes burning?

A. Light B. Sound C. Heat D. A new smell

Q8.What is a significant outcome of chemical changes in our lives?

A. They primarily cause changes in the physical state of matter B. They are responsible for the formation of all new substances C. They only lead to the absorption of energy, not its release D. They are limited to laboratory experiments and have little real-world impact

Q9.Which of the following is a characteristic outcome of a firework explosion?

A. Production of only light and sound B. Absorption of heat from the atmosphere C. Formation of new elements D. Production of heat, light, sound, and unpleasant gases

Q10.What is the primary reason for the change in color observed when a slice of apple, potato, or brinjal is not consumed immediately?

A. Evaporation of water content B. Absorption of atmospheric moisture C. Formation of new substances D. Physical decomposition of cells

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Science Practice Quiz 172