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4976

The depolarizing agent in a Leclanché cell is 

  • A. powdered carbon.
  • B. manganese (IV) oxide.
  • C. carbon rod.
  • D. ammonium.
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4977

Which of the following terms has different dimension from the others?

  • A. Stress x Strain
  • B. Pressure
  • C. \(\frac{\text{stress}}{\text{strain}}\)
  • D. Torque
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4978

A capacitor described as a mica capacitor has

  • A. both plates are made of mica.
  • B. a mica dielectric.
  • C. a dielectric made of mica
  • D. the same capacitance as that of mica
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4979

In which of the following devices is the thermal expansion considered a disadvantage?

  • A. Fire alarm
  • B. Thermostat
  • C. Bimetallic thermometer
  • D. Balance wheel of a watch
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4980

The inside portion of a hollow metal sphere of diameter 20 cm is polished. The portion will therefore form a 

  • A. Concave mirror of focal length 5cm.
  • B. Concave mirror of focal length 10 cm.
  • C. Convex mirror of focal length 10 cm
  • D. Convex mirror of focal length 5cm
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