## THERMAL PHYSICS QUIZ-5

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. For proper ventilation of building ,windows must be oe near the bottom and top of the walls so as to let pass
•  In more air
•  In cool air near the bottom and hot air out near the proof
•  In hot air near the roof and cool air ou near the bottom
•  Out hot air near the roof
Solution
Density of hot air is lesser than the density of cold air so hot air rises up

Q2.Two thermometers A and B are exposed in sun light. The valve of A is pointed black, but that of B is not pointed. The correct statement regarding this case is
•  Temperature of A will rise faster than B but the final temperature will be the same in both
•  Both A and B show equal rise in beginning
•  Temperature of A will remain more than B
•  Temperature of B will rise faster
Solution
As for a black body rate of absorption of heat is more.Hence thermometer A shows faster rise in temperature but finally both will acquire the atmosphere temperature

Q3.  A piece of glass is heated to a high temperature and then allowed to cool. If it cracks, a probable reason for this is the following property of glass
•   Low thermal conductivity
•  High thermal conductivity
•  High specific heat
•  High melting point
Solution
When a piece of glass is heated ,due to low thermal conductivityit does not conduct heat fast .Hence unequal expansion of it's layers crack the glass.

Q4. When two ends of a rod wrapped with cotton are maintained at different temperatures and after same time every point of the rod attains a constant temperature, then
•  Conduction of heat at different points of the rod stops because the temperature is not increasing
•  Rod is bad conductor of heat
•  Heat is being radiated from each point of rod
•  Each point of rod is giving heat to its neighbouring at the same rate at which it is receiving
Solution
Because steady state has been reached.

Q5.A body radiates energy 5W at a temperature of 127℃. If the temperature is increased to 927℃,then it radiates energy at the rate of
•  410W
•  81W
•  405W
•  200W
Solution

Q6. In a radiation spectrum obtained from a furnace of 2600 K has maximum intensity at 12000 â„« wavelength. If the maximum intensity in spectrum of a star is at 5000 A. the temperature of the outer surface of star is
•  7800K
•  6240K
•  5240K
•  3640K
Solution

Q7.47. How much heat energy is gained when 5 kg of water at 20℃ is brought to its boiling point (specific heat of water =4.2 kJ kg-1c-1)
•  1680kj
•  1700kj
•  1720kj
•  1740kj
Solution

Q8.The point on the pressure-temperature phase diagram where all the three phases co-exist is called
•  Sublimation point
•  Fusion point
•  Triple point
•  Vaporization point
Solution

Q9.Distrubution of energy in the spectrum of a black body can be correctly represented by
•  Wien's law
•  stefan's law
•  planck's law
•  Kirchhoff's law
Solution
Because planck's law explains the distrubution of energy correctly at low temperature as well as at hih temperature

Q10. 4200j of work is required for
•  Increasing the temperature of 10 gm of water through 10℃
•  Increasing the temperature of 100 gm of water through 10℃
•  Increasing the temperature of 1 kg of water through 10℃
•  Increasing the temperature of 10 kg of water through 10℃
Solution

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