## THERMAL PHYSICS QUIZ-7

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. An ice box made of Styrofoam (Thermal conductivity=0.01Jm-1s-1K-1) is used to keep liquids cool. It has a total wall area including lid of 0.8 m2 and wall thickness of 0.2 cm. A bottle of water is placed in the box and filled with ice. If the outside temperature is 30℃ the rate flow of heat into the box is (in Js-1)
•  16
•  14
•  12
•  10
Solution

Q2.Two rods of same length and material transfer a given amount of heat in 12 s, when they are joined end to end (ie, in series). But when they are joined in parallel, they will transfer same heat under same conditions in
•  24s
•  3s
•  48s
•  1.5s
Solution

Q3.  Which one of the following is vm-T graph for perfectly black body? vm is the frequency of radiation with maximum intensity, T is the absolute temperature.

•   D
•  C
•  B
•  A
Solution
sol

Q4. The wavelength of radiation emitted by a body depends upon
•  The nature of its surface
•  The area of its surface
•  The temperature of its surface
•  All the above factors
Solution

Q5.The real coefficient of volume expansion of glycerine is 0.000597 per℃ and linear coefficient of expansion of glass is 0.000009 per℃. Then the apparent volume coefficient of expansion of glycerine is
•  0.000558 per℃
•  0.00057 per℃
•  0.00027 per℃
•  0.00066 per℃
Solution

Q6. Temperatures of two stars are in ratio 3:2. If wavelength of maximum intensity of first body is 4000â„«, what is corresponding wavelength second body?
•  9000â„«
•  6000â„«
•  2000â„«
•  8000â„«
Solution

Q7.The temperature of the sun is measured with
•  Platinum therommeter
•  Gas therometer
•  Pyrometer
•  Vapour pressure thermometer
Solution

Q8.A wall has two layers A andB, made of two different materials. The thermal conductivity of material A is twice that ofB. If the two layers have same thickness and under thermal equilibrium, the temperature difference across the wall is 48℃, the temperature difference across layer B is
•  40℃
•  32℃
•  16℃
•  24℃
Solution

Q9.Two bars of thermal conductivities K and 3K and lengths 1cm and 2cm respectively have equal cross-sectional area, they are joined lengths wise as shown in the figure. If the temperature at the ends of this composite bar is 0℃ and 100℃ respectively (see figure), then the temperature of the interface is
•  50℃
•  1003℃
•  60℃
•  2003℃
Solution

Q10. If the temperature of the sun becomes twice its present temperature, then
•  Radiated energy would be predominantly in infrared
•  Radiated energy would be predominantly in ultraviolet
•  Radiated energy would be predominantly in X-ray region
Solution

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