The correct answer is (a) P = F/A. Pressure (P) is defined as the force (F) applied per unit area (A). Mathematically, it is given by: P = F/A This means that pressure increases if force increases or area decreases.
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Mohan Batra
Asked: In: Class 9 Science
(a) +3 and -3 respectively. Aluminium (Al) has a valency of +3 because it loses three electrons to achieve stability. Phosphate (PO₄³⁻) has a valency of -3 as it gains three electrons. They combine to form AlPO₄ in a neutral ...
Kaveri Jha
Asked: In: Class 9 Science
The correct answer is (d) All of these. Iodine, camphor, and naphthalene all undergo sublimation, meaning they directly change from solid to gas without becoming liquid. This process occurs due to weak intermolecular forces, allowing these substances to vaporize upon ...
Kaveri Jha
Asked: In: Class 9 Science
The correct answer is (b) Solid < Liquid < Gas. In solids, particles are tightly packed with minimal space between them. In liquids, particles have more space and can move freely. In gases, particles are far apart, allowing them to ...