Electromagnetic Induction in Daily Life — Important Questions
Kerala Board · Class 10 · Physics
43 important questions from Electromagnetic Induction in Daily Life for Kerala Board Class 10 Physics, with answers. Written for the board exams 2027.
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Important Questions from Electromagnetic Induction in Daily Life
Which of the following factors increase the induced EMF in a coil? (Select all correct options)
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Increasing the number of turns in the coil, Using a stronger magnet, Moving the magnet faster
Induced EMF increases with: (1) More turns in coil - more flux linkages, (2) Stronger magnet - higher magnetic field, (3) Faster relative motion - rapid change in flux. Wire thickness affects resistance, not induced EMF.
Which of the following are advantages of transmitting electricity at high voltage? (Select all correct)
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Reduces power loss during transmission, Reduces current in transmission lines, Reduces heat generation in wires
High voltage transmission reduces current (P = VI, so I = P/V). Lower current means less power loss as heat (P = I²R) and reduced heating in transmission lines. It doesn't affect production cost or speed of electricity.
A step-up transformer increases 11kV to 220kV. If the primary has 1000 turns, how many turns does the secondary have?
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20000 turns
Using Vs/Vp = Ns/Np. Given: Vp = 11kV, Vs = 220kV, Np = 1000. Therefore: Ns = (Vs × Np)/Vp = (220 × 1000)/11 = 20000 turns. The voltage ratio is 220:11 = 20:1, so turn ratio is also 20:1.
What type of power stations generate most of India's electricity?
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Thermal power stations
About 75% of electricity generation in India comes from thermal power stations that burn fuels like coal and natural gas to generate steam for rotating turbines.
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Sources & Official References
- Kerala Board of Public Examinations — keralapareekshabhavan.in
- National Education Policy 2020 — education.gov.in
Content is aligned to the official syllabus. Refer to the board website for the latest curriculum.
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