## THERMAL PHYSICS QUIZ-2

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. At a common temperature,a block of wood and a block of mental feel equally cold or hot.The temperature of block of wood and block of metal are
•  Equal to temperature of the body
•  Less than the temperature of the body
•  Greater than temperature of the body
•  Either (b) or (c)
Solution
When the temperature of an object is equal to that of human body, no heat is transferred from the object to body and vice versa. Therefore block of wood and block of metal feel equally cold and hot if they have same temperature as human body

Q2.If there are no heat losses,the heat released by the condensation of x g of steam at 100℃ into water at 100℃ can be used to convert y gm of ice at 0℃ into water at 100℃.Then the ratio y:x is nearly
•  1:1
•  2.5:1
•  2:1
•  3:1
Solution

Q3.  13. The resistance of a resistance thermometer has values 2.71 and 3.70 ohm at 10℃ and 100℃. The temperature at which the resistance is 3.26 ohm is
•   40℃
•  50℃
•  60℃
•  70℃
Solution

Q4. Ratio among linear expansion coefficient , areal expansion coefficient (Î²) and volume expansion coefficient is
•  1:2:3
•  3:2:1
•  4:3:2
•  None of these
Solution

Q5.A hollow copper sphere S and a hollow copper cube C, both of negligible thin walls of same area, are filled with water at 90℃ and allowed to cool in the same environment. The graph that correctly represents their cooling is
•  a
•  b
•  c
•  d
Solution

Q6. A solid copper sphere (density and specific heat capacity c) of radius r at an initial temperature 200K is suspended inside a chamber whose walls are at almost 0K. The time required (in Î¼ s) for the temperature of the sphere to drop to 100 K is
•  722 rpc
•  772 rpc
•  277 rpc
•  727 rpc
Solution

Q7.Three rods of the same dimension have thermal conductivities 3K,2Kand K. They are arranged as shown in fig.Given below, with their ends at 100℃ , 50℃ , and 20℃ .The temperature of their juction is
•  60℃
•  70℃
•  50℃
•  35℃
Solution

Q8.There are two spherical balls A and B of the same material with same surface,but the diameter of A is half that of B.If A and B are heated to the same temperature and then allowed to cool,then
•  Rate of cooling is same in both
•  Rate of cooling of A is four times that of B
•  rate of cooling of A is twice that of B
•  rate of cooling of A is 14 times that of B
Solution

Since diameter of A is half that of B so it's rate of cooling will be doubled that of B.

Q9.The maximum energy in thermal radiation from a source occurs at the wave length 4000A.The effective temperature of the source is
•  7325K
•  800K
•  104K
•  106K
Solution

Q10. An experiment takes 10 min to raise temperature of water from 0℃ and 100℃ and another 55min to convert it totally into steam by a stabilized heater.The lantent heat of another 55min to convert it totally intosteam by a stabilized heater.The lantent heat of vaporization comes out to be
•  530 calg-1
•  540 calg-1
•  550 calg-1
•  560 calg-1
Solution

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