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How mirror can be identified by observing the values of the magnification?

How mirror can be identified by observing the values of the magnification? If an object is placed within the focal length of a mirror, the image of the object will get magnified in case of a concave mirror, and will get diminished in case of a convex mirror. The value of magnification will be greater than 1 in case of a concave mirror, and less than 1 in case of a convex mirror.

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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