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What is thermometry?

Thermometry The branch of heat relating to the measurement of the temperature of a body is called thermometry. The thermometer is an instrument used to measure the temperature of a body. The essential requisites of a thermometer are given as under:  1) Construction, 2) Calibration, and 3) Sensitiveness. For the construction of a thermometer, the proper choice of a substance, whose physical property varies uniformly with rising in temperature, is essential. 1) Construction The physical property of a substance plays an important role in the construction of a thermometer. In a mercury thermometer, the principle of expansion of mercury with rising temperature is used. The platinum resistance thermometer is based on the principle of the change in resistance with a change in temperature. The gas thermometer is based on the principle of change in volume or pressure with a change in temperature. 2) Calibration  When a thermometer is constructed, it should be properly calibrated. The standa

Work, Energy, and Power

Physics

Chapter - 4: Work, Energy, and Power

👉 All Chapter Contents 👈 


  • 4.2 Energy

  • 4.3 Different forms of Energy

  • 4.4 Sources of Energy

  • 4.5 Conservation and Transformation of Energy

  • 4.6 Relation between mass and Energy

  • 4.7 Power


Question Bank

4.1 Work

  • What is work?
  • What is the unit of work?
  • What is the dimension of work?
  • What do you understand by 40 J work?
  • What is one Joule?
  • What is positive work?
  • What is negative work?

4.2 Energy

  • What is energy?
  • What is the unit of energy?
  • What is the dimension of energy?

4.3 Different forms of Energy

  • Write the names of the different forms of energy.
  • What is kinetic energy?
  • What is potential energy?
  • What does the potential energy depend on?
  • What do you mean by 300 J of the potential energy of an object?
  • What do you mean by 300 J of the kinetic energy of an object?

4.4 Sources of Energy

  • What do you mean by chemical energy?
  • Describe the different types of chemical energy.
  • Describe the contribution of coal considering its economic, social, and environmental impact.
  • Describe the contribution of natural gas considering its economic, social, and environmental impact.
  • What do you mean by solar energy?
  • Write the use of solar energy.
  • What is hydroelectricity?
  • How can be hydroelectricity be generated?
  • What is wind energy?
  • Write the uses of wind energy.
  • What do you understand about geothermal energy?
  • Write the impact of energy transformation on the environment.

4.5 Conservation and Transformation of Energy

  • What is conservation of energy?
  • What do you understand by the transformation of energy?
  • How electrical energy is transformed?
  • How chemical energy is transformed?
  • How heat energy is transformed?
  • How mechanical energy is transformed?
  • How light energy is transformed?

4.6 Relation between mass and Energy

  • Explain the meaning of the equation E = mc2.
  • 1 eV = How many Joules?
  • 200 MeV = How many Joules?
  • 1 kilowatt hour = How many Joules?
  • What is the nuclear reaction?
  • What is chain reaction?

4.7 Power

  • What is power?
  • What is the unit of power?
  • What is the dimension of power?
  • What do you mean by one watt?
  • What does 40 W mean on an electric bulb?
  • Write differences between work and power.
  • Write differences between energy and power.

4.8 Efficiency

  • What is efficiency?
  • Why can't be the efficiency of an instrument 100%?
  • What do you understand by the efficiency of an instrument is 80%?

4.9 Role of Energy in Development Activities

  • Explain the role of energy in development activities.


Secondary Physics


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