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Thermal Properties of Matter Test - 69

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Thermal Properties of Matter Test - 69
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  • Question 1
    1 / -0
    A and B are two points on a uniform metal ring whose centre is O. The angle AOB = θ\theta. A angle B are maintained at two different constant temperatures. When θ=180o\theta = 180^o, the rate of total heat flow from A to B is 1.2W1.2 W. When θ=90o\theta = 90^o then this rate will be
    Solution

  • Question 2
    1 / -0
    With cold wind keeping the surface at 20oC20^oC a layer of ice on a pond grows in thickness from 20 mm to 21 mm in 10 min. Later with the surface at the same temperature it will grow from 40 mm to 42 mm in approximately
  • Question 3
    1 / -0
    A refrigerator is thermally equivalent to a box of cork board 90mm\mathrm { mm } thick and m2\mathrm { m } ^ { 2 } in inner surface area, the thermal conductivity of cork being 0.05W/mK\mathrm { W } / \mathrm { mK } . The motor of the refrigerator runs 15%\% of the time while the door closed. The inside wall of the door, when it is closed,is kept, on an average, 22C22 ^ { \circ } \mathrm { C } below the temperature of the outside wall. The rate at which heat is taken from the interior wall while the motor is running is
    Solution

  • Question 4
    1 / -0
    The thermal radiation from a hot body travels with a speed of
    Solution
    Thermal radiations are infrared radiations. These are basically electromagnetic waves. All electromagnetic waves travel with a speed of 3×108 m/s3\times 10^8\ m/s.
  • Question 5
    1 / -0
    A body cools from 6262^{\circ}   C  to   5050^{\circ}C  in 10 minutes and then to 4242^{\circ} C in next 10 minutes.  The temperature of surrounding is : 
  • Question 6
    1 / -0
    Water standing in the open at 320C32^0C evaporates because of the escape of some of the surface molecules. The heat of vaporization (540cal/g540 cal/g) is approximately equal to ϵ\epsilonn, where ϵ\epsilon is the average energy of the escaping molecules and n is the number of molecules per gram. The value of ϵ\epsilon is close to
  • Question 7
    1 / -0
    A 20gm bullet whose specific heat is 5000 J/ (kg- oC^o C) and moving at 2000 m/s plunges into a 1.0 kg block of wax whose specific heat is 3000 J/(kg- oC^o C). Both bullet and wax are 25oC25^o C and assume that (i) the bullet comes to rest in the wax and (ii) all its kinetic energy goes into heating the wax.  Thermal temperature of the wax in oC^o C is close to
    Solution

  • Question 8
    1 / -0
    On a hypothetical scale  AA  the ice point is  4242 ^ { \circ }  and the steam points is  182182 ^ { \circ }  For another scale   B,B,  the ice point is  10- 10 ^ { \circ }  and steam point is  9090 ^ { \circ }   If  BB  reads  60,60 ^ { \circ } ,  the reading of  AA  is,
    Solution

  • Question 9
    1 / -0
    Two spheres of the same material havethe same radius but one is hollow while the other is solid. Both spheres are heated to same temperature. Then
    Solution

  • Question 10
    1 / -0
    Two identical rods of a metal are welded as shown in figure (a). A certain amount of heat flows through them in 12 min. If the rods are welded as shown in figure (b) then the same amount of heat will flow in 

    Solution

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