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Thermal Properties of Matter Test - 6

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Thermal Properties of Matter Test - 6
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Weekly Quiz Competition
  • Question 1
    4 / -1
    A clock which keeps correct time at 20°C, is subjected to 40°C. If coefficient of linear expansion of the pendulum is 12 × 10-6° C-1. How much will it gain or lose time?
  • Question 2
    4 / -1
    A brass rod of length 500 mm and diameter 3 mm is joined to a steel rod of same length and diameter at 50°C. If the coefficients of linear expansion of brass and steel are 2.5 × 10-5 °C-1 and 1.25 × 10-5 °C-1, then change in length of the combined rod at 200°C is
  • Question 3
    4 / -1
    A wire 3 m in length and 1 mm in diameter at 30°C is kept in a low temperature at –170°C and is stretched by hanging a weight of 10 kg at one end. The change in length of the wire is (Y = 2 × 1011 Nm-2, g =10 ms-2 and α =1.2 × 10-5°C-I)
  • Question 4
    4 / -1
    The temperature of a thin uniform circular disc, of lm diameter is increased by 10°C. The percentage increase in moment of inertia of the disc about an axis passing through its centre and perpendicular to the circular face. (linear coefficient of expansion =11 × 10-6°C-1)
  • Question 5
    4 / -1
    An iron bar of length 10 m is heated from 0°C to 100°C. If the coefficient of linear thermal expansion of iron is 10 × 10-6°C-1, the increase in the length of bar is
    Solution

  • Question 6
    4 / -1
    A composite rod made of copper (α=1.8 × 10-5 K-1 ) and steel (α =1.2 × 10-5 K-1 ) is heated. Then,
  • Question 7
    4 / -1
    In an experiment, on the specific heat of a metal, a 0.20 kg block of the metal at 150°C is dropped in a copper calorimeter (of water equivalent 0.025 kg) containing 150 cc of water at 27°C. The final temperature is 40°C. Calculate the specific heat of the metal. if heat losses to the surroundings are not negligible, is our answer greater or smaller than the actual value of specific heat of the metal?
  • Question 8
    4 / -1
    A scientist proposes a new temperature scale in which the ice point in 25 X (X is the new unit of temperature) and the steam point is 305 X. The specific heat capacity of water in this new scale is (in J kg -I X -1 )
  • Question 9
    4 / -1
    A steam at 100°C is passed into 1 kg of water contained in a calorimeter of water equivalent 0.2 kg at 9°C till the temperature of the calorimeter and water in it is increased to 90°C. The mass of steam condensed in kg is nearly (specific heat of water =1 cal/g°C, and latent heat of vaporisation = 540 cal/g)
    Solution

  • Question 10
    4 / -1
    250 g of water and equal volume of alcohol of mass 200 g are replaced successively in the same calorimeter and cool from 60° to 55° in 130 s and 67 s respectively. If the water equivalent of the calorimeter is 10 g, then the specific heat of alcohol in cal/g°C is
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