Class XI

A washer consists of a 3.00 cm diameter circle of sheet metal with a 1.00 cm diameter circular hole in the middle. If the metal washer is heated until the diameter of the washer is 3.03 cm, then the diameter of the hole will be
  1. 1.00 cm
  2. 1.01 cm
  3. 0.97 cm
  4. 0.98 cm
Three liquids of densities d, 2d and 3d are mixed in equals proportions of weights. The relative density of the mixture is
  1. 18/11d
  2. 23/18d
  3. 11/7d
  4. 13/9d
A hole is drilled in a copper sheet. The diameter of the hole is 4.24 cm at 27.0 ∘∘C. What is the change in the diameter of the hole when the sheet is heated to 227 ∘∘C? Coefficient of linear expansion of copper = 1.70 ×× 10−510−5 K–1.
  1. 1.54 x 10−210−2 cm
  2. 1.24 x 10−210−2 cm
  3. 1.34 x 10−210−2 cm
  4. 1.44 x 10−210−2 cm.
Which of the following statement(s) is/are true? (I) Every substance contains heat. (II) For heat to flow between two substances, they must be at different temperatures. (III) The internal energy of a substance is equal to the kinetic energy of the molecules in the substance.
  1. II only
  2. II and III only
  3. I and II only
  4. III only
On a day when the temperature reaches 50∘∘F, what is the temperature in degrees Celsius and in kelvins?
  1. 10∘∘ C, 283 K
  2. 10∘∘ C, 283 K
  3. 12∘∘ C, 303 K
  4. 12∘∘ C, 303 K
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