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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 is correct statement ?

  2. According to Charle's Law, which of the following is constant?

  3. Which of the following statements is/are correct?

    I. Mass vapor is obtained in the air by evaporation and transpiration.

    II. Water circulation between the oceans and the water bodies is called the water cycle.

  4. Which state of matter is characterized by a high-energy collection of ionized particles, where atoms have lost or gained electrons, making it electrically conductive, and is the most common state of matter in the universe?

  5. A change of state directly from solid to gas without changing into liquid state is called

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