## THERMAL PHYSICS QUIZ-9

As per analysis for previous years, it has been observed that students preparing for NEET find Physics out of all the sections to be complex to handle and the majority of them are not able to comprehend the reason behind it. This problem arises especially because these aspirants appearing for the examination are more inclined to have a keen interest in Biology due to their medical background.

Furthermore, sections such as Physics are dominantly based on theories, laws, numerical in comparison to a section of Biology which is more of fact-based, life sciences, and includes substantial explanations. By using the table given below, you easily and directly access to the topics and respective links of MCQs. Moreover, to make learning smooth and efficient, all the questions come with their supportive solutions to make utilization of time even more productive. Students will be covered for all their studies as the topics are available from basics to even the most advanced.

Q1. The top of insulated cylindrical container is covered by a disc having emissivity 0.6 and thickness 1 cm. The temperature is maintained by circulating oil as shown in figure. If temperature of upper surface of disc is 127℃ and temperature of surrounding is 27℃, then the radiation loss to the surroundings will be (Take Ïƒ=17310-8W/m2K4)
•  595 J/m2×s
•  595 cal/m2×s
•  991.0 J/m2×s
•  440 J/m2×s
Solution

Q2.Two rods of equal lengths and areas of cross-section are kept parallel and hanged between temperatures 20℃ and 80℃. The ratio of the effective thermal conductivity to that of the first rod is (the ratio=K1K2 =34 )
•  7:4
•  7:6
•  4:7
•  7:8
Solution

Q3.  The temperature of a body on Kelvin scale is found to be x K. When it is measured by Fahrenheit thermometer, it is found to be xoF, then the value of x is
•   40
•  313
•  574.25
•  301.25
Solution

Q4. Which of the following cylindrical rods will conduct most heat, when their ends are maintained at the same steady temperature
•  Length 1 m; radius 1 cm
•  Length 2 m; radius 1 cm
•  Length 2 m; radius 2 cm
•  Length 1 m; radius 2 cm
Solution

Q5.Steam is passed into 22 g of water at 20℃. The mass of water that will be present when the water acquires a temperature of 90℃ (Latent heat of steam is 540 cal/g) is
•  24.8 g
•  24 g
•  36.6 g
•  30 g
Solution

Q6. The resistance of the wire in the platinum resistance thermometer at ice point is 5 and at steam point is 5.25.When the thermometer is inserted in an unknown hot bath its resistance is found to be 5.5.The temperature of the hot bath is
•  100°C
•  200°C
•  300°C
•  350°C
Solution

Q7.The amount of heat energy radiated by a metal at temperature T is E. when the temperature is increased to 3T, energy radiated is
•  81E
•  9E
•  3E
•  27E
Solution

Q8.Energy is being emitted from the surface of a black body at 127℃ temperature at the rate of 1.0×106J/s-m2. Temperature of the black body at which the rate of energy emission is 16.0×106J/s-m2 will be
•  254℃
•  508℃
•  527℃
•  727℃
Solution

Q9.A metal rod having linear expansion coefficient 2×10-5℃-1 has a length of 1 m at 20℃. The temperature at which it is shortened by 1 mm is
•  -20℃
•  -15℃
•  -30℃
•  -25℃
Solution

Q10. Hot water kept in a beaker placed in a room cools from 70℃ to 60℃ in 4 minutes. The time taken by it to cool from 69℃ to 59℃ will be
•  The same 4 mintues
•  More then 4 minutes
•  Less than 4 minutes
•  We cannot say definitely
Solution

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