In-text Questions — Domestic Circuits — Magnetic Effects of Electric Current

1. 12 marksNCERT Cl-10 Science, In-text Qs after §12.4, Q1

   Name two safety measures commonly used in electric circuits and appliances.

   Hint. One measure protects the circuit itself; the other protects the person touching the appliance.

   Step 1 — Circuit protection. A fuse, placed in series with the circuit, melts and breaks the circuit if the current rises too high (from a short circuit or overloading).

   Step 2 — User protection. Earthing — connecting the metallic body of an appliance to an earth wire — gives any leaked current a safe path to the ground, protecting the user from shocks.

   ✦ Answer: A fuse (protects the circuit from excess current) and earthing/an earth wire (protects the user from shocks due to current leakage).

   Where students slip. Naming only the fuse — earthing is an equally important, but distinct, safety measure covered in this chapter.

2. 22 marksNCERT Cl-10 Science, In-text Qs after §12.4, Q2

   An electric oven of 2 kW power rating is operated in a domestic electric circuit (220 V) that has a current rating of 5 A. What result do you expect? Explain.

   Hint. Work out the current the oven itself needs, then compare it to what the circuit is rated to safely carry.

   Step 1 — Find the current the oven draws. I = P/V = 2000/220 ≈ 9.09 A.

   Step 2 — Compare with the circuit's rating. This exceeds the circuit's 5 A rating.

   Step 3 — State the consequence. The excess current would cause the circuit's fuse to blow (or, if there were no fuse, could overheat the wiring), since the circuit isn't designed to safely carry this much current.

   ✦ Answer: The oven draws about 9.09 A, which exceeds the circuit's 5 A rating — the fuse would blow (or the circuit could overheat), so this oven shouldn't be run on this circuit.

   Where students slip. Assuming the oven will simply run at reduced power — exceeding a circuit's rated current trips the safety mechanism (or risks damage), rather than the appliance quietly drawing less power.

3. 32 marksNCERT Cl-10 Science, In-text Qs after §12.4, Q3

   What precaution should be taken to avoid the overloading of domestic electric circuits?

   Hint. Think about how many high-power appliances should share one socket or circuit.

   Step 1 — Recall what causes overloading. Overloading happens when too many appliances are connected to a single socket/circuit, or when a voltage surge occurs, since either one pushes the current beyond the circuit's rating.

   Step 2 — State the precaution. Avoid connecting too many high-power appliances to the same socket or circuit at once, and use separate circuits (e.g. a higher-current-rated circuit for heavy appliances like geysers) as intended.

   ✦ Answer: Avoid connecting too many appliances (especially high-power ones) to a single socket or circuit at the same time, keeping high-power appliances on their own appropriately rated circuit.

   Where students slip. Naming only 'use a fuse' as the precaution — a fuse limits the damage after overloading starts; the precaution asked for here is about preventing the overload in the first place.

Solutions written by the tuition.in editorial team and checked against the NCERT Class 10 Science textbook, Reprint 2026-27 (jesc112.pdf) — five in-text question sets (12 questions total) plus one end-of-chapter Exercise (9 questions, not 18 as some older manifests claim). The electric motor, electromagnetic induction and electric generator have been removed from this chapter entirely (confirmed by full-text search) — they are named once as example devices, with no construction/working explained, and don't appear in the chapter's own 'What you have learnt' summary. One exercise question (Q7(iii)) still references induced current despite this; it is answered using Fleming's right-hand rule, flagged accordingly.. Questions are referenced from the NCERT textbook for identification.