Which one of the following statements is INCORRECT ?

The measurable unit of pressure is denoted in Metre.

The correct answer is option 1. The measurable unit of pressure is denoted in Metre.

Let us look at each option separately:

1. The measurable unit of pressure is denoted in Metre: This statement is incorrect. The measurable unit of pressure is not denoted in meters. Pressure is typically measured in units such as Pascals (Pa), atmospheres (atm), millimeters of mercury (mmHg), or pounds per square inch (psi). These units represent force per unit area and are not related to distance or length.

2. Evaporation causes cooling: This statement is correct. Evaporation is a process in which molecules in a liquid state gain sufficient energy to enter the gaseous state. During evaporation, the molecules with the highest kinetic energy leave the liquid surface, leading to a decrease in the average kinetic energy of the remaining molecules. This reduction in average kinetic energy corresponds to a decrease in temperature, resulting in cooling.

3. Matter is made up of small particles: This statement is correct. Matter is composed of tiny particles called atoms, molecules, or ions. These particles have mass and occupy space. The kinetic theory of matter states that these particles are in constant motion, and their behavior determines the properties of matter.

4. Brass is a mixture of 30% zinc and 70% copper: This statement is correct. Brass is an alloy composed primarily of copper and zinc, with varying compositions depending on the specific application. The proportions mentioned (30% zinc and 70% copper) are commonly used in brass alloys, but the exact composition may vary based on the desired properties of the brass. Brass is valued for its corrosion resistance, machinability, and attractive appearance.

In summary, three out of the four statements provided are correct, while the first statement regarding the unit of pressure is incorrect. Pressure is not denoted in meters; it is typically measured in units such as Pascals, atmospheres, millimeters of mercury, or pounds per square inch.