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Physical and Chemical Changes Practice Questions

Class 7 · Science · 1170 free MCQs with instant results and detailed explanations.

1170
Total
354
Easy
579
Medium
237
Hard

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Topics in Physical and Chemical Changes

Physical Changes 278
Rusting 288
Chemical Changes 320
Crystallisation 284

Sample Questions from Physical and Chemical Changes

Here are 10 sample questions. Start a quiz to get randomized questions with scoring.

Q1
Easy
When sugar dissolves in water, what type of change occurs?
A. Chemical change
B. Physical change
C. Nuclear change
D. Biological change
Show Answer & Explanation
Correct Answer: B
The process of sugar dissolving in water is a physical change since the sugar can be recovered by evaporation.
Q2
Easy
Which of the following processes does NOT involve a physical change?
A. Freezing of water
B. Chopping vegetables
C. Baking a cake
D. Slicing bread
Show Answer & Explanation
Correct Answer: C
Baking a cake involves a chemical change as it results in a new substance formed through baking.
Q3
Easy
What happens to the size of a balloon when it is heated?
A. It shrinks
B. It stays the same
C. It expands
D. It pops instantly
Show Answer & Explanation
Correct Answer: C
Heating the air inside a balloon causes it to expand, increasing its volume as the air molecules move faster.
Q4
Medium
Which of the following is an example of a physical change?
A. Melting of ice
B. Rusting of iron
C. Burning of wood
D. Decomposition of food
Show Answer & Explanation
Correct Answer: A
Melting of ice is a physical change because it only changes the state of water from solid to liquid without altering its chemical composition.
Q5
Medium
Which process does NOT involve a physical change?
A. Dissolving sugar in water
B. Chopping vegetables
C. Baking a cake
D. Freezing water
Show Answer & Explanation
Correct Answer: C
Baking a cake involves a chemical change due to the formation of new substances through the cooking process.
Q6
Medium
What happens to the molecules in a substance during a physical change?
A. They form new compounds.
B. They rearrange but remain the same.
C. They are destroyed.
D. They lose mass.
Show Answer & Explanation
Correct Answer: B
During a physical change, the molecules rearrange but their chemical structure remains the same, hence they are unchanged chemically.
Q7
Medium
Which of the following is a characteristic of a physical change?
A. Change in chemical composition
B. Reversibility
C. Production of new substances
D. Change in odor
Show Answer & Explanation
Correct Answer: B
Physical changes are usually reversible, meaning that the substance can return to its original state.
Q8
Hard
Which of the following is a characteristic feature of a physical change?
A. It produces new substances.
B. It is irreversible.
C. It changes the physical state of a substance.
D. It involves a chemical reaction.
Show Answer & Explanation
Correct Answer: C
A physical change alters the form or appearance of a substance but does not change its chemical composition. Examples include changes in state, such as melting or freezing.
Q9
Hard
If 100 grams of ice melts into water, how much energy is required for this physical change, assuming the latent heat of fusion of ice is 334 J/g?
A. 33400 Joules
B. 16700 Joules
C. 10000 Joules
D. 6670 Joules
Show Answer & Explanation
Correct Answer: A
To calculate the energy required for melting ice, multiply the mass of the ice (100 grams) by the latent heat of fusion (334 J/g). This results in 33400 Joules.
Q10
Hard
Which of the following is NOT an example of a physical change?
A. Melting of ice
B. Boiling of water
C. Rusting of iron
D. Dissolving sugar in water
Show Answer & Explanation
Correct Answer: C
Rusting of iron is a chemical change because it forms a new substance, iron oxide.

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Physical and Chemical Changes — Class 7 Science Practice Questions Online

This page contains 1170 practice MCQs for the chapter Physical and Chemical Changes in Class 7 Science. The questions are organized by difficulty — 354 easy, 579 medium, 237 hard — so you can choose the right level for your preparation.

Every question includes a detailed explanation to help you understand the concept, not just memorize answers. Take a timed quiz to simulate exam conditions, or practice at your own pace with no time limit. This chapter covers 4 topics, giving you comprehensive coverage of the entire chapter.