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Question

Brownian motion of smoke particles in air strongly supports which model of matter?

This question was previously asked in
HTET 2025 Level 1 PRT Question Paper (5-Jul-2026)
The correct answer is

Particulate kinetic model

The random, zig-zag movement of smoke particles suspended in air arises from continuous, random collisions with fast-moving, invisible air molecules. This observation gives strong evidence for the particulate kinetic model, confirming matter is made of discrete, constantly moving particles.

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Important Questions from States of Matter

  1. Which of the following correctly represents the strength of attraction between particles in the three states of matter?
  2. Which of the following does NOT occur with an increase in temperature?
  3. Which of the following is a correct property of solids?
  4. Why do we spread cloths while putting them for drying in open sky?
    a. Increasing the surface area will increase the rate of evaporation
    b. Increase in wind speed will not allow the cloth to fly
    c. To remove wrinkles
  5. The forces of attraction between particles are ______ in solids, ______ in liquids, and ______ in gases.
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