Tag: physics

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Multiple choice physics energy and its forms idea of energy introduction to work and energy work and energy

The internal energy change when a system goes from state A to B is $40$ kJ/mole. If the system goes from A to B by a reversible path and returns to state A by an irreversible path what would be the net change in internal energy?

  1. $40$ kJ
  2. $> 40$ kJ
  3. $< 40$ kJ

  4. Zero
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation
For a cyclic process the net change in the internal energy is zero because the change in internal energy doesnot depend on the path.

Multiple choice physics the essence of change forms of energy and energy conservation energy for everything forms of energy

Hydro-electric power generates

  1. Electrical energy

  2. Nuclear energy

  3. Thermal energy

  4. None of these
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Hydro-electric power is the process where moving water rotates the turbine. Here potential energy of water converts into kinetic enery of water when waters falls downwards from a height.

After that kinetic energy of water transferred to kinetic energy of turbine and turbine starts rotating. 
After this turbine's kinetic energy is converted into electrical energy and in this way electricity is generated. 
Hence hydro-electric power generates electrical energy.