Class 7 Exam > Class 7 Notes > Science (Curiosity) Class 7 - New NCERT > Unit Test: Changes Around Us: Physical and Chemical
Unit Test: Changes Around Us: Physical and Chemical | Science (Curiosity) Class 7 - New NCERT PDF Download
Time: 1 Hour
Maximum Marks: 30
Instructions:
Attempt all questions.
Question numbers 1 to 5 carry 1 mark each .
Question numbers 6 to 8 carry 2 marks each.
Question numbers 9 to 11 carry 3 marks each.
Question numbers 12 and 13 carry 5 marks each.
Q1: What type of change occurs when ice melts into water? (1 Mark)
a) Chemical change
b) Physical change
c) Irreversible change
d) Combustion
Q2: Which gas turns lime water milky? (1 Mark)
a) Oxygen
b) Nitrogen
c) Carbon dioxide
d) Hydrogen
Q3: What is the minimum temperature at which a substance catches fire called? (1 Mark)
a) Boiling point
b) Ignition temperature
c) Melting point
d) Freezing point
Q4: Which of the following is an example of an irreversible change? (1 Mark)
a) Folding paper
b) Burning wood
c) Melting wax
d) Boiling water
Q5: What process involves the physical movement of rocks and soil by wind or water? (1 Mark)
a) Weathering
b) Rusting
c) Erosion
d) Combustion
Q6: What is rusting, and why is it considered a chemical change? (2 Mark)
Q7: Name the three requirements for combustion. (2 Mark)
Q8: What is bioluminescence, and where is it observed? (2 Mark)
Q9: Explain the difference between physical and chemical changes, providing one example for each and stating whether they are reversible or irreversible. (3 Mark)
Q10: Why is oxygen essential for combustion, and how can this be demonstrated using a candle? (3 Mark)
Q11: Explain how burning a candle involves both physical and chemical changes, providing specific examples of each ( 3 Mark)
Q12: Discuss the environmental impact of chemical changes caused by human activities, such as burning fuels and drying paint. Explain how these changes contribute to pollution, and suggest two ways to reduce their environmental effects. Provide one example of a chemical change with both desirable and undesirable outcomes. (5 Mark)
Q13: Describe the role of the fire triangle in combustion, and explain how removing one element can stop a fire. (5 Mark)
You can find the solutions of this Unit Test here: Unit Test Solution: Changes Around Us: Physical and Chemical
The document Unit Test: Changes Around Us: Physical and Chemical | Science (Curiosity) Class 7 - New NCERT is a part of the Class 7 Course Science (Curiosity) Class 7 - New NCERT.
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FAQs on Unit Test: Changes Around Us: Physical and Chemical - Science (Curiosity) Class 7 - New NCERT
| 1. What are the key differences between physical and chemical changes? |  |
Ans.Physical changes are changes that affect one or more physical properties of a substance without altering its chemical composition. Examples include changes in state (like melting or freezing), shape, or size. Chemical changes, on the other hand, involve a transformation that alters the chemical composition of a substance, resulting in the formation of new substances. Examples include rusting of iron, combustion, and digestion of food.
| 2. Can you provide examples of physical changes found in everyday life? | |
Ans. Yes, common examples of physical changes include melting ice into water, boiling water to produce steam, dissolving sugar in water, and breaking a glass. In each of these cases, the substance remains the same chemically, even though its form or state may have changed.
| 3. What are some indicators that a chemical change has occurred? | |
Ans. Indicators of a chemical change include a change in color, the production of a gas (bubbles), the formation of a precipitate (solid), temperature change (exothermic or endothermic reactions), and changes in smell. For example, when vinegar reacts with baking soda, bubbles form, indicating a gas is being produced.
| 4. How do the processes of photosynthesis and respiration illustrate chemical changes? | |
Ans. Photosynthesis is a chemical change where plants convert carbon dioxide and water into glucose and oxygen using sunlight. The chemical composition of the reactants changes to form new products. Similarly, respiration is a chemical change where glucose is broken down with oxygen to release energy, carbon dioxide, and water. Both processes demonstrate how substances undergo chemical transformations.
| 5. Why is it important to understand the differences between physical and chemical changes in science? | |
Ans. Understanding the differences between physical and chemical changes is crucial for various scientific applications, including chemistry, biology, and environmental science. It helps in predicting how substances will behave under different conditions, understanding reactions, and applying this knowledge in fields like material science, medicine, and environmental protection. This knowledge is foundational for experiments and real-world problem solving.
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