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NEET 2020 Revision: Thermal Properties of Matter - 3 (03.12.2019)
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Question 1
A lead bullet penetrates into a solid and melts. Assuming that 50% of its kinetic energy was used to heat it, the initial speed the bullet is (the initial temperature of bullet is 250C and its melting point is 3000C). Latent heat of fusion of lead = 2.5 x 104 J/kg and specific heat capacity of lead= 125J/kg-K
Question 2
A body cools from 50oC to 40oC in 5 minutes. The surrounding temperature is 20oC. In what further time (in minutes) will it cool to 30oC
Question 3
If in two identical containers, equal quantity of ice melts completely in 30 and 20 min respectively, then the ratio of the thermal conductivities of the material of two containers is
Question 4
Three rods of same dimensions have thermal conductivities 3K, 2K and K. They are arranged as shown, with their ends at 100oC, 50oC and 0oC. The temperature of their junction is
Question 5
Two solid spheres of radii R1 and R2 are made of the same material and have similar surfaces. These are raised to the same temperature and then allowed to cool under identical conditions. The ratio of their initial rates of loss of heat are
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Jun 23NEET & AIIMS