Physical Changes Quiz - CBSE Class 7 Science
Free practice quiz: Physical Changes (CBSE Class 7 Science). 20 multiple-choice questions with answers and explanations. Play online, no sign-up needed.
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What is a common characteristic of physical changes?
- New substances are formed
- Color change occurs
- No new substances are formed
- Gas is released
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Answer: C. No new substances are formed
A physical change is one where no new substances are formed. The change is mostly in the form of state or appearance.
Which property is not typically changed in a physical change?
- Shape
- Mass
- Volume
- Chemical Structure
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Answer: D. Chemical Structure
Physical changes typically do not alter the chemical structure of a substance. Properties like shape, mass, and volume may change.
Why does ice melt into water when heated?
- It undergoes a chemical change
- The molecules break apart
- Molecular motion increases
- New substances are formed
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Answer: C. Molecular motion increases
When ice melts, the heat causes increased molecular motion, leading to a change in state from solid to liquid, indicating a physical change.
Which statement about evaporating water is true?
- It changes into a new substance
- It is a chemical change
- It involves a change in energy
- It changes the chemical bonds
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Answer: C. It involves a change in energy
Evaporating water involves a change in energy as heat is absorbed to break intermolecular forces and change state, not the chemical bonds.
What occurs during the freezing of water?
- Molecular rearrangement
- Chemical bonds form
- Water decomposes
- New elements are formed
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Answer: A. Molecular rearrangement
Freezing involves molecular rearrangement as water changes from liquid to solid, with molecules slowing down and forming a structured lattice.