Friday, 28 February 2025

CLASS 7 Electric Current and Its Effects

 Worksheet 1

Class 7 Science 

Chapter: Electric Current and Its Effects
(CBSE Pattern)

Section A: Very Short Answer Questions (1 Mark Each)

  1. Define electric current.
  2. What is an electric circuit?
  3. Name any two appliances that work using the heating effect of electric current.
  4. What is an electromagnet?
  5. What is the role of a switch in an electric circuit?
  6. What happens when an electric current passes through a coil wound around an iron nail?

Section B: Short Answer Questions (2 Marks Each)

  1. Differentiate between a closed circuit and an open circuit.
  2. Explain the heating effect of electric current with an example.
  3. What is the function of an electric fuse?
  4. Why is tungsten used in the filament of an electric bulb?
  5. What is meant by the magnetic effect of electric current?
  6. Why does a compass needle deflect when placed near a current-carrying wire?

Section C: Long Answer Questions (3 Marks Each)

  1. Explain how an electric bell works with the help of a labeled diagram.
  2. How is an electromagnet made? Mention two uses of electromagnets.
  3. What factors affect the amount of heat produced in a wire when current flows through it?
  4. Describe how a fuse prevents electrical hazards.

Worksheet 2

Class 7 Science – Electric Current and Its Effects

Maximum Marks: 25
Time: 1 Hour

Section A – Very Short Answer Questions (1 Mark Each)

  1. What is an electric circuit?
  2. Define an electric fuse.
  3. What is the SI unit of electric current?
  4. Name one appliance that works due to the heating effect of electric current.
  5. Who discovered the magnetic effect of electric current?

Section B – Short Answer Questions (2 Marks Each)

  1. Explain the heating effect of electric current with an example.
  2. Why is tungsten used as the filament in an electric bulb?
  3. How does an electric fuse protect electrical appliances?
  4. What is an electromagnet? Mention one of its uses.
  5. What happens when an electric current flows through a wire?

Section C – Long Answer Questions (3 Marks Each)

  1. Explain the working of an electric bell with a neat diagram.
  2. Describe an experiment to show the magnetic effect of electric current.
  3. How does the strength of an electromagnet increase? Mention two factors.
  4. List three devices that work on the principle of the heating effect of electric current and explain one of them.

Section D – Diagram-Based Question (4 Marks)

  1. Draw a labeled diagram of an electric bell and explain its working.
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