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THERMAL PHYSICS QUIZ-1

Dear Readers,

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 luminosity of the Rigel star is 17000 times that of the sun. Assume both to be perfectly black bodies. If the surface temperature of the sun is 6000 K, then the temperature of the star is
  •  68400 K
  •  1.02*108 K
  •  12000 K
  •  68400 ℃
Solution



Q2.The weight of a person is 60 kg. If he gets 105 calories heat through food and the efficiency of his body is 28%, then upto how much height he can climb (approximately)
  •  100 m
  •  200 m
  •  400 m
  •  1000 m
Solution



Q3.  If on heating liquid through 80℃, the mass expelled is 1/100th of mass still remaining, the coefficient of apparent expansion of liquid is
  •   1.25×10-4/℃
  •  12.510-4/℃
  •  1.25×10-5/℃
  •  None of these
Solution


Q4. The initial temperature of a body is 80℃. If its temperature falls to 64℃ in 5 minutes and in 10 minutes to 52℃ then the temperature of surrounding will be
  •  26℃
  •  49℃
  •  35℃
  •  42℃
Solution



Q5.80 gm of water at 30℃ are poured on a large block of ice at 0℃.The mass of ice that melts is
  •  30 gm
  •  80 gm
  •  1600 gm
  •  150 gm
Solution
 



Q6. Which one of the following processes depends on gravity?
  •  Conduction
  •  Convection
  •  Radiation
  •  None of these
Solution
In convection, the heated lighter particles move upwards and colder heavier particles move downwards to their place.This depends on weight and hence,on gravity.

Q7.Four pieces of iron heated in a furnace to different temperatures show different colours listed below.Which one has the highest temperature
  •  White
  •  Yellow
  •  Orange
  •  Red
Solution
At low temperature short wavelength radiation is emitted.As the temperature rises colour of emitted radiations are in the following order Red-->yellow -->Blue-->White(at highest temperature)

Q8.Boiling water is changing into steam.At this stage then specific heat of water is
  •   <1 span="">
  •   infinity
  •  1
  •  0
Solution



Q9.Three rods of same dimensions are arranged as shown in figure. They have thermal conductivities K1,K2 and K3. The points P and Q are maintained at different temperatures for the heat to flow at the same rate along PRQ and PQ then which of the following options is correct
  •  K3=12(K1+K2)
  •  K3=K1+K2
  •  K3=K1K2K1+K2
  •  K3=2(K1+K2)
Solution


Q10. 10. A slab consists of two parallel layers of two different materials of same thickness having thermal conductivities K1 and K2. The equivalent conductivity of the combination is
  •  K1+K2
  •  K1+K22
  •  2K1K2K1+K2
  •  K1+K22K1K2
Solution




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