Class X

If an unmarked thermometer, which contains alcohol in its bulb, has l100 14 cm and l0 is 4 cm, if lθ is 9 cm temperature of thermometer would be
  1. 50 °C
  2. 60 °C
  3. 75 °C
  4. 10 °C
If an object flies into space, its
  1. Mass and weight both would remain same
  2. Mass would remain same but weight would change
  3. Mass and weight both would change
  4. Mass would change but weight would remain same
Every temperature measuring instrument makes use of a physical property of a substance in order to measure temperature objectively, which physical property is used by Constant-volume gas thermometer?
  1. Electromotive force
  2. Volume of a fixed mass of liquid
  3. Resistance of a piece of metal
  4. Pressure of a fixed mass of gas at constant volume
If two forces of 10 N and 5 N are acting on an object in a same direction, what will be total force acting on object?
  1. 10 N
  2. 15 N
  3. 50 N
  4. 5 N
Scale of temperature requires
  1. A thermometric substance that has a chemical property that varies with temperature
  2. A thermometric substance that has a chemical property which does not change with temperature
  3. A thermometric substance that has a physical property which changes with temperature
  4. A thermometric substance that has a physical property which does not change with temperature
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