On decreasing the heat, the kinetic energy of particles also decreases.

Answer

**Step-by-Step Solution:**

1. **Understanding the Statement**: The statement provided is "On decreasing the heat, the kinetic energy of particles also decreases." We need to determine if this statement is true or false.

2. **Defining Kinetic Energy**: Kinetic energy is the energy that an object possesses due to its motion. In the context of particles, it refers to how fast the particles are moving.

3. **Relationship Between Heat and Temperature**: Heat is a form of energy that can increase the temperature of a substance. When heat is added to a system, the temperature of the system rises, which leads to an increase in the kinetic energy of the particles.

4. **Effect of Decreasing Heat**: When heat is decreased, the temperature of the substance also decreases. A lower temperature means that the particles have less energy and, therefore, move slower.

5. **Conclusion**: Since kinetic energy is directly related to the temperature of the particles, decreasing the heat (and thus the temperature) results in a decrease in the kinetic energy of the particles. Therefore, the statement is true.

**Final Answer**: The statement is true. Decreasing heat leads to a decrease in the kinetic energy of particles.

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