Science Practice Quiz 169

Q1.What do the fats in our body primarily contain?

A. Amino acids B. Deoxyribonucleic acids C. Fatty acids D. Hydrochloric acids

Q2.According to the provided text, broadly, changes in our surroundings are of how many kinds?

A. One B. Two C. Three D. Four

Q3.Which of the following is explicitly mentioned as an example of a change in our surroundings in the given text?

A. Burning of wood B. Rusting of iron C. Souring of milk D. Digestion of food

Q4.The activities described in section 5.1 of the text, such as cutting paper, crushing chalk, and melting ice, are primarily used to illustrate which type of change?

A. Chemical changes B. Biological changes C. Physical changes D. Nuclear changes

Q5.As per Activity 5.3, what two substances combine to form a 'freezing mixture'?

A. Water and common salt B. Ice and sugar C. Ice and common salt D. Water and sugar

Q6.In Activity 5.1, after cutting a piece of paper into smaller square pieces, what observation is made regarding the original piece?

A. The pieces can be easily joined back to form the original piece. B. The paper's chemical composition changes significantly. C. The pieces cannot be joined back to make the original piece. D. The paper becomes a new substance entirely.

Q7.What is the implied outcome of adding a little water to chalk dust and rolling it into a shape, as described in Activity 5.2?

A. To observe a chemical reaction B. To recover chalk from the dust C. To create a new compound D. To demonstrate solubility

Q8.According to Activity 5.3, what happens when a mixture of ice and water is placed in a freezing mixture?

A. The ice melts completely. B. The water becomes solid ice once again. C. The water evaporates. D. The mixture boils.

Q9.Which of the following is a characteristic feature of a physical change?

A. A new substance is always formed. B. It is generally irreversible. C. It involves a change in the chemical composition. D. No new substance is formed.

Q10.Based on the provided text, which of the following is an example of a physical change?

A. Rusting of iron B. Formation of a brownish substance on iron C. Water changing its state from solid to liquid D. A substance undergoing a change in its chemical composition

Sign in with Email

Science Practice Quiz 169