Class 10 Physics · Chapter 9 · Test 1
Test 1: Electromagnetic Induction, Magnetic Flux, Faraday’s Law and Lenz’s Law
31 questions · 25 min · 31 marks
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Sample questions
The first 5 of 31. Try each one, then tap to see the answer.
Question 1
What happens to the induced e.m.f. in a coil if the rate of change of the magnetic field increases?
- ADecreases
- BRemains the same
- CIncreases
- DBecomes zero
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Answer: C
A faster change in magnetic field produces a greater induced e.m.f. (Exercise A 18.1).
Question 2
Electromagnetic induction is the process by which a changing magnetic field produces:
- Aa magnetic pole
- Ban electric current in a conductor
- Ca static charge
- Dheat only
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Answer: B
This is the definition of electromagnetic induction.
Question 3
Electromagnetic induction was first discovered by Michael Faraday and at the same time by:
- AJoseph Henry
- BIsaac Newton
- CJames Maxwell
- DHeinrich Hertz
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Answer: A
It was discovered by Faraday and Joseph Henry in 1831.
Question 4
Electromagnetic induction was discovered in the year:
- A1731
- B1831
- C1931
- D1631
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Answer: B
The discovery was made in 1831.
Question 5
When a magnet is kept still near a coil connected to a galvanometer, the needle:
- Adeflects to the right
- Bdeflects to the left
- Cdoes not move
- Doscillates continuously
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Answer: C
No electricity is produced because there is no change in the magnetic field.
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