The method of purifying water by passing it through a semipermeable membrane under pressure is called:
A. Ozonation
B. Chlorination
C. Reverse osmosis
D. Distillation
Answer: Option C
Solution (By JKExamLibrary)
Reverse osmosis (RO) uses pressure to force water through a membrane that blocks dissolved salts and impurities. Distillation uses boiling/condensation. Chlorination and ozonation are disinfection methods, not for desalination.
Explanation:
An alpha particle (α) consists of 2 protons and 2 neutrons, which is the same as a helium-4 nucleus (²⁴He²⁺). It has a +2 charge. Beta particles are electrons (β⁻) or positrons (β⁺). Gamma rays are electromagnetic waves with no mass or charge. Alpha particles have low penetration power and are stopped by a sheet of paper or skin. Rutherford used alpha particles in his scattering experiment.
Explanation:
Pepsin is a protease secreted in the stomach; it hydrolyzes proteins into peptides. Ptyalin (salivary amylase) digests starch; amylase also breaks starch; lipase digests fats.
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