According to kinetic theory of matter the average K.E of a molecule is directly proportional to the temperature However in a solid the molecules are closely packed and can only vibrate about a mean position ans not displace totally If a rod is heated at one end t molecules will vibrate with larger amplitude collide with the nelghbours and transfer energy When a steady state is reached there is no net transfer of heat from one end to another Before the steady state is achived, however there is a temperature gradient Answer the following questions based on above passage: A rod of length l is heated at the middle. If two points are chosen at a distance 'x' cm on either side of the midpoint, to record the temperatures as t_1 and t_2 on the left and right

Materials expansion character depends on their being isotropic or anisotropic The superficial and cubical expansion coefficients can be arrived at by the addition of linear coefficient in the three dimensions. While studying the expansion of a solid or a liquid one should consider the expansion of the container also. Any hole in a conductor will become larger on getting heated up as one comments ''expansion is a photographic enalargement". Each liquid has its own characteristics behaviour to change of temperature. Answer the following questions based on above passage: Two sphere of radii is the ratio 1 : 2 of same material, but the first being solid and the second hollow are heated On heating to the same temperature the ratio of the change in their volume will be

Read the following four statements (A-D) A. The first transgenic bufflao ,Rosie produced milk Which was human alpha-lactalbumin enriched. B. Restrication enzymes are used in isolation of DNA from other macromolecules. C. Downstream proceesing is one of the steps of rDNA technology. D. Disarmed pathogen vectors are also used in transfer of rDNA into the host. Which of the two statements have mistake ?