Science Practice Quiz 180

Q1.What is the primary purpose of Activity 6.4?

A. To measure the volume of air exhaled. B. To observe the difference in chest size during breathing. C. To determine the lung capacity of classmates. D. To understand the role of the diaphragm in breathing.

Q2.When exhaled air is passed through freshly prepared lime water, what change is typically observed?

A. The lime water turns milky. B. The lime water becomes colorless. C. The lime water starts to boil. D. The lime water forms a precipitate at the bottom.

Q3.According to the provided text, what is the nature of the air we exhale?

A. It consists solely of carbon dioxide. B. It is a pure gas, primarily oxygen. C. It is a mixture of gases. D. It is only water vapor.

Q4.What appears on the surface of a mirror when a person exhales on it?

A. A film of dust. B. A film of moisture. C. A layer of carbon dioxide. D. A thin layer of oil.

Q5.In the model described to demonstrate the mechanism of breathing (Fig. 6.7), what do the balloons represent?

A. The diaphragm. B. The rib cage. C. The lungs. D. The trachea.

Q6.What is one of the benefits of regular traditional breathing exercises like pranayama?

A. It reduces the body's energy requirements. B. It decreases the capacity of lungs to take in air. C. It increases the capacity of lungs to take in more air. D. It primarily strengthens the heart muscles.

Q7.What is the ultimate outcome of increased oxygen supply to body cells, as a result of improved lung capacity from pranayama?

A. Reduced cellular activity. B. Decreased energy release. C. Release of more energy. D. Increased carbon dioxide absorption.

Q8.Which of the following animals, besides human beings, is mentioned as having lungs in their chest cavities?

A. Cockroach B. Earthworm C. Fish D. Elephant

Q9.In insects like cockroaches, what are the small openings on the sides of their body called, which facilitate gas exchange?

A. Stomata B. Pores C. Spiracles D. Gills

Q10.The network of air tubes called tracheae, responsible for gas exchange in insects, is found in which of the following groups of animals?

A. Only insects B. Insects and amphibians C. Insects and reptiles D. Insects and birds

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Science Practice Quiz 180