## THERMAL PHYSICS QUIZ-4

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 original temperature of a black body is 727℃. The temperature at which this black body must be raised so as to double the total radiant energy, is
•  971 K
•  1190 K
•  2001 K
•  1458 K
Solution

Q2.Latent heat of 1gm of steam is 536 cal/gm, then its value in joule/kg is
•  2.25*106
•  2.25*103
•  2.25
•  None
Solution

Q3.  On a hilly region, water boils at 95°C.The temperature expressed in Fahrenheit is
•   100°F
•  20.3°F
•  150°F
•  203℉
Solution

Q4. A cylindrical rod having temperature T1 and T2 at its ends.The rate of flow of heat is Q1 cal/s.If all the linear dimensions are doubled keeping temperature constant then rate of flow of heat Q2 willl be
•  4Q1
•  2Q1
•  Q14
•  Q12
Solution

Q5.The gas thermometers are more sensitive than liquid thermometers because
•  Gases expand more than liquids
•  Gases are easily obtained
•  Gases are much lighter
•  Gases do not easily change their states
Solution

Q6. The graph shows the variation of temperature (T) of one kilogram of a material with the heat (H) supplied to it. At O, the substance is in the solid state. From the graph, we can conclude that
•  T2 is the melting point of the solid
•  BC represents the change of state from solid to liquid
•  (H2-H1) represents the latent heat of fusion of the substance
•  (H3-H1)represents the latent heat of vaporization of the liquid.
Solution

Q7.Two rectangular blocks A and B of different metals have same length and same area of cross-section. They are kept in such a way that their cross-sectional area touch each other. The temperature at one end of A is 100℃ and that of B at the other end is 0℃. If the ratio of their thermal conductivity is 1 : 3, then under steady state, the temperature of the junction in contact will be
•  25℃
•  50℃
•  75℃
•  100℃
Solution

Q8.The volume of a metal sphere increases by 0.24% when its temperature is raised by 40℃.The coefficent of linear expansion of the metal is.../℃
•  2*10-5
•  6*10-5
•  18*10-5
•  1.2*10-5
Solution

Q9.Flash light equipped with a new set of batteries, produces bright white light. As the batteries were out
•  The light intensity gets reduced with no change in its colour
•  Light colour changes first to yellow and then red with no change in intensity
•  It stops working suddenly while giving white light
•  Colour changes to red and also intensity gets reduced
Solution

Q10. Water of volume 2 L in a container is heated with a coil of 1 kW at 27℃ . The lid of the container is open and energy dissipates at rate of 160 Js-1. In how much time temperature will rise from 27℃ to 77℃ [Given specific heat of water is 4.2 kJ kg-1]
•  8 min 20 s
•  6 min 2s
•  7 min
•  14 min
Solution

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