NEET Problems | Thermal Properties of Matter | 2013 to 2017 | Chapterwise Solutions by Rohit Dahiya

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COACHengg App Download Link: https://play.google.com/store/apps/details?id=com.rdnc.coachengg Learn more about the coachengg app: https://youtu.be/VLD8NzXIMyc Share this Video - Spread Learning Link to share: https://youtu.be/7l0aL3ty4zo NEET and AIPMT Solutions – Thermal Properties of Matter – 2013 to 2017 Q01 – NEET 2013 – 00:08 – 05:02 Q02 – AIPMT 2014 – 05:03 – 10:59 Q03 – AIPMT 2014 – 11:00 – 17:41 Q04 – AIPMT 1 2015 – 17:42 – 20:41 Q05 – AIPMT 1 2015 – 20:42 – 25:09 Q06 – AIPMT 2 2015 – 25:10 – 29:55 Q07 – NEET 1 2016 – 29:56 – 33:57 Q08 – NEET 1 2016 – 33:58 – 38:19 Q09 – NEET 1 2016 – 38:20 – 42:48 Q10 – NEET 2 2016 – 42:49 – 47:55 Q11 – NEET 2 2016 – 47:56 – 54:08 Q12 – NEET 2017 – 54:09 – 58:22 Q13 – NEET 2017 – 58:23 – 01:02:46 Q01 – NEET 2013 – A piece of iron is heated in a flame. It first becomes dull red then becomes reddish yellow and finally turns to white hot. The correct explanation for the above observation is possible by using : (A) Newton's Law of cooling (B) Stefan's Law (C) Wien's displacement Law (D) Kirchoff's Law Q02 – AIPMT 2014 – Steam at 100ºC is passed into 20 g of water at 10ºC. When water acquires a temperature of 80ºC, the mass of water present will be: [Take specific heat of water = 1 cal g–1ºC–1 and latent heat of steam = 540 cal g–1] Q03 – AIPMT 2014 – Certain quantity of water cools from 70ºC to 60ºC in the first 5 minutes and 60ºC to 54ºC in the next 5 minutes. The temperature of the surroundings is: Q04 – AIPMT 1 2015 – The two ends of a metal rod are maintained at temperatures 100°C and 110°C. The rate of heat flow in the rod is found to be 4.0 J/s. If the ends are maintained at temperatures 200°C and 210°C, the rate of heat flow will be: Q05 – AIPMT 1 2015 – On observing light from three different stars P, Q and R, it was found that intensity of violet colour is maximum in the spectrum of P, the intensity of green colour is maximum in the spectrum of R and the intensity of red colour is maximum in the spectrum of Q. If TP, TQ and TR are the respective absolute temperatures of P, Q and R, then it can be concluded from the above observations that: Q06 – AIPMT 2 2015 – The value of coefficient of volume expansion of glycerin is 5 × 10-4 K-1. The fractional change in the density of glycerin for a rise of 40°C in its temperature, is :- (A) 0.010 (B) 0.015 (C) 0.020 (D) 0.025 Q07 – NEET 1 2016 – A piece of ice falls from a height h so that it melts completely. Only one-quarter of the heat produced is absorbed by the ice and all energy of ice gets converted into heat during its fall. The value of h is: [Latent heat of ice is 3.4 × 105 J/kg and g = 10 N/kg] Q08 – NEET 1 2016 – Coefficient of linear expansion of brass and steel rods are 𝛼_1 and 𝛼_2. Lengths of brass and steel rods are 𝑙_1 and 𝑙_2 respectively. If (𝑙_2−𝑙_1) is maintained same at all temperatures, which one of the following relations holds good? Q09 – NEET 1 2016 – A black body is at a temperature of 5760 K. The energy of radiation emitted by the body at wavelength 250 nm is U1, at wavelength 500 nm is U2 and that at 1000 nm is U3. Wien's constant, b = 2.88 × 106 nmK. Which of the following is correct? Q10 – NEET 2 2016 – Two identical bodies are made of a material for which the heat capacity increases with temperature. One of these is at 100ºC, while the other one is at 0ºC. If the two bodies are brought into contact, then assuming no heat loss, the final common temperature is (A) 0º C (B) 50º C (C) more than 50º C (D) less than 50º C but greater than 0º C Q11 – NEET 2 2016 – A body cools from a temperature 3T to 2T in 10 minutes. The room temperature is T. Assume that Newton's law of cooling is applicable. The temperature of the body at the end of next 10 minutes will be: (A) T (B) 7T/4 (C) 3T/2 (D) 4T/3 Q12 – NEET 2017 – Two rods A and B of different materials are welded together as shown in figure. Their thermal conductivities are K1 and K2. The thermal conductivity of the composite rod will be: Q13 – NEET 2017 – A spherical black body with a radius of 12 cm radiates 450 watt power at 500 K. If the radius were halved and the temperature doubled, the power radiated in watt would be: (A) 225 (B) 450 (C) 1000 (D) 1800 _________________________________________________________________ Visit our facebook page https://www.facebook.com/coachenggg Visit our website https://www.coachengg.com Visit our youtube channel https://www.youtube.com/coachengg4u COACHENGG4U Follow us on INSTAGRAM https://www.instagram.com/coachengg Follow us on Google Plus https://plus.google.com/+coachengg4u ________________________________________________________________