Choose the correct statement s from the following A A

Last updated: 6/18/2023

Choose the correct statement s from the following A A temperature change which increases the length of a steel rod by 0 1 will increase its volume by nearly 0 3 B C D The specific heat of a gas is different when heated at i constant pressure and ii the constant volume The thermal conducitvity of air being less than that for wool we prefer wool to air for thermal insulation When the distance between two fixed points is measured with a steel tape the observed reading will be less on a hot day than on a cold day Statement b is also correct 1 When a solid is heated at constant pressure it does expand a little and some heat is required for doing the mechanical work associated with this expansion i When a solid is heated at constant volume only internal energy changes and no heat is required for doing the mechanical work The difference between the two specific heats at constant pressure and at constant volume is small enough to be generally neglected for solids and liquids This difference is large for gases Statement c is incorrect The thermal conductivity of air is less than that of wool Yet we prefer wool which traps pockets of air between its fibres There air pockets cannot carry heat by convection either Statement d is correct because of the expansion of steel tape on a hot day the markings on the tape would be farther apart than on a cold day I did not understand why c is not corr ect Is there any other explanation for t his answer for c to be false I had asked this qn earlier but i was not able to understand and I accidentally cli cked YES for the feedback So could you pls explain once more The qn and answer both says that ther mal conductivity of air is less than that