Final answer:
The height of water raised by capillary action will be less in both a paraffin tube and a silver tube compared to a glass tube, due to the weaker adhesive forces between water and these materials.
Step-by-step explanation:
The question is related to capillary action which is a phenomenon in physics where liquids rise or fall in a narrow tube due to the intermolecular forces between the liquid and the tube material. The height to which water will rise in tubes of different materials, but the same radius, depends on the adhesive forces between the water molecules and the tube material.
(a) In a paraffin tube, water will rise to a lesser height than in a glass tube because paraffin is hydrophobic (water-repellent), leading to weaker adhesive forces compared to glass which is hydrophilic (water-attracting). (b) In a silver tube, water will also rise to a lesser height as the adhesive forces between water and silver are not as strong as those between water and glass.
Therefore, the correct answer is (d) (a) Lesser (b) Lesser, as water will be raised to a lesser height in both the paraffin and the silver tube compared to the glass tube.