Class 8 Science Chapter 4: Electricity: Magnetic and Heating Effects — practice questions with answers
Free practice for Class 8 Science, Chapter 4: Electricity: Magnetic and Heating Effects. Try the solved questions below, then take a free test with instant marking and explanations.
51 questions19 easy, 26 medium, 6 hardNCERT · CBSE · State boards
Sample questions with solutions
Q1. Sumana made a lifting electromagnet: an iron nail wrapped with wire and connected to a battery picked up paper clips. What happened when she opened (switched off) the circuit?
- The paper clips fell off the nail
- The clips stuck more strongly
- The nail became hot and melted
- Nothing changed
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Answer: A. The paper clips fell off the nail
Why: The nail is a magnet only while current flows. [p.47]
Why: The nail is a magnet only while current flows. [p.47]
Q2. What happens to a compass needle near a wire when current flows through the wire?
- It gets deflected
- It stops working
- It points south only
- It spins continuously
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Answer: A. It gets deflected
Why: When current stops, it returns to its original direction. [p.48]
Why: When current stops, it returns to its original direction. [p.48]
Q3. A coil of insulated wire wound around an iron nail that becomes a magnet when current flows is called an ______.
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Answer: electromagnet
Why: It is a temporary magnet. [p.49]
Why: It is a temporary magnet. [p.49]
Q4. Which devices use the magnetic effect of electric current? (Tick all that apply)
- Electric bell
- Electric motor in a fan
- Loudspeaker
- Electric kettle
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Answer: A. Electric bell; B. Electric motor in a fan; C. Loudspeaker
Why: A kettle uses the heating effect. [p.49, p.54]
Why: A kettle uses the heating effect. [p.49, p.54]
Q5. Opposition offered by a conductor to the flow of electric current is called ______.
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Answer: resistance
Why: It causes heating in the conductor. [p.53]
Why: It causes heating in the conductor. [p.53]
Q6. Which appliances use the heating effect of electric current? (Tick all that apply)
- Electric iron
- Immersion rod
- Hair dryer
- Loudspeaker
Show answer
Answer: A. Electric iron; B. Immersion rod; C. Hair dryer
Why: Fig. 4.6 shows heating appliances. [p.54]
Why: Fig. 4.6 shows heating appliances. [p.54]
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Frequently asked questions
How many practice questions are there for Class 8 Science Chapter 4: Electricity: Magnetic and Heating Effects?
51 questions (19 easy, 26 medium, 6 hard). A few are solved on this page; the free test shows the answer and explanation for every question after you submit.
Is this chapter from the NCERT book?
Yes — it follows the NCERT Class 8 Science syllabus, used by CBSE and many state boards.