Sign in
12thPass logo
New chatPYQ LibraryDoubtsRank report
Sign in to see Recents

Your guest activity stays on this device

Sign in to save progress →
Sign in

Properties of Matter question

2012 · Q98
Guest · filters and generic practice availableBrowsing as a guest · PYQ filters and generic practice are available. Sign in only for personalised features and saved progress.
  1. PYQ Library
  2. /NEET
  3. /Physics
  4. /Properties of Matter
  5. /2012 · Q98

Properties of Matter question

2012 · Q98

NEETPhysicsProperties of MatterMCQ+4 / −1
A slab of stone of area 0.36 m2 and thickness 0.1 m is exposed on the lower surface to steam at 100oC. A block of ice at 0oC rests on the upper surface of the slab. In one hour 4.8 kg of ice is melted. The thermal conductivity of slab is
(Given latent heat of fusion of ice = 3.36 ×\times× 105 J kg−-−1)
  1. A
    1.24 J/m/s/oC
  2. B
    1.29 J/m/s/oC
  3. C
    2.05 J/m/s/oC
  4. D
    1.02 J/m/s/oC
View written solutionFree

Correct answer: A

Rate of heat given by steam = Rate of heat taken by ice

where K = Thermal conductivity of the slab
m = Mass of the ice
L = Latent heat of melting/fusion
A = Area of the slab

dQdt=KA(100−0)1=mdLdt{{dQ} \over {dt}} = {{KA\left( {100 - 0} \right)} \over 1} = m{{dL} \over {dt}}dtdQ​=1KA(100−0)​=mdtdL​,

K×100×0.360.1=4.8×3.36×10560×60{{K \times 100 \times 0.36} \over {0.1}} = {{4.8 \times 3.36 \times {{10}^5}} \over {60 \times 60}}0.1K×100×0.36​=60×604.8×3.36×105​

K =1.24 J/m/s/°C

PreviousNext

More from Properties of Matter

  • If the radius of a star is R and it acts as a black body, what would be the temperature of the star, in which the rate of energy production is Q?2012 · MCQ
  • Liquid oxygen at 50 K is heated to 300 K at constant pressure of 1 atm. The rate of heating is constant. Which one of the following graphs represents the variation of temperature with time ?2012 · MCQ
  • A cylindrical metallic rod in thermal contact with two reservoirs of heat at its two ends conducts an amount of heat Q in time t. The metallic rod is melted and the material is formed into a rod of half the radius of the original rod. What…2010 · MCQ
  • The total radiant energy per unit area, normal to the direction of incidence, received at a distance R from the centre of a star of radius r, whose outer surface radiates as a black body at a temperature TK is given by2010 · MCQ
  • Assuming the sun to have a spherical outer surface of radius r, radiating like a black body at temperature toC, the power received by a unit surface, (normal to the incident rays) at a distance R from the centre of the sun is where σ…2010 · MCQ
  • A black body at 227oC radiates heat at the rate of 7 cals/cm2s. At a temperature of 727oC, the rate of heat radiated in the same units will be2009 · MCQ
  • The two ends of a rod of length L and a uniform cross-sectional area A are Kept at two temperatures T1 and T2 (T1 > T2). The rate of heat transfer, dtdQ​ through the rod in a steady state is given by :2009 · MCQ
  • On a new scale of temperature (which is linear) and called the W scale, the freezing and boiling points of water are 39oW and 239oW respectively. What will be the temperature on the new scale, corresponding to a temperature of 39oC on the…2008 · MCQ