Class XI

A cylindrical jar of cross-sectional area 0.01 m2m2 is filled with water to a height of 50 cm. It carries a tight-fitting piston of negligible mass. What is the pressure at the bottom of the jar when mass of 1 kg is placed on the piston? Take g = 10m s−2s−2
  1. 5000 Pa
  2. 2000 Pa
  3. 6000 Pa
  4. 4000 Pa
A steel railroad track has a length of 30.000 m when the temperature is 0.0∘∘C.Suppose that the ends of the rail are rigidly clamped at 0.0∘∘C so that expansion is prevented. What is the thermal stress set up in the rail if its temperature is raised to 40.0∘∘C? α−steel=11×10−6α−steel=11×10−6 (∘∘C)-1 Y-steel =20GPa
  1. 9.1 ×× 107N/m2
  2. 8.1 ×× 107N/m2
  3. 8.8 ×× 106N/m2
  4. 8.4 ×× 106N/m2
A 0.050 0-kg ingot of metal is heated to 200.0∘∘C and then dropped into a beaker containing 0.400 kg of water initially at 20.0∘∘C. If the final equilibrium temperature of the mixed system is 22.4∘∘C, find the specific heat of the metal.
  1. 4.83 J/kg∘∘C
  2. 4.63 J/kg. ∘∘C
  3. 4.73 J/kg. ∘∘C
  4. 4.53 J/kg. ∘∘C
The triple points of neon is 24.57 K. Express this temperatures on the Celsius and Fahrenheit scales
  1. –248.58 ∘∘C = – 415.44 ∘∘F
  2. –208.58 ∘∘C = – 355.44 ∘∘F
  3. –238.58 ∘∘C = – 315.44 ∘∘F
  4. –218.58 ∘∘C = – 335.44 ∘∘F
The triple points of carbon dioxide is 216.55 K. Express this temperatures on the Celsius and Fahrenheit scales
  1. – 76.60 ∘∘C = – 120.88 ∘∘F
  2. – 66.60 ∘∘C = – 99.88 ∘∘F
  3. – 56.60 ∘∘C = – 69.88 ∘∘F
  4. – 86.60 ∘∘C = – 150.88 ∘∘F
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