MCQ practice · SSC Physics Board questions · Chapter 11: Current Electricity
How many mA of electric current through the human heart will kill a person?
Think it through first, then pick an option.
- a 240
- b 220
- c 10
- d 1.5
Answer and explanation
Correct answer: c 10
According to the book, only 10 mA of current straight through the heart can kill a person.
Why the other options are wrong
- a 240: 240 is not the book value; the question asks for a current, and the fatal current is 10 mA.
- b 220: 220 is the supply voltage in our country (220 V), not a current; the fatal current is 10 mA.
- d 1.5: 1.5 is the voltage of an ordinary cell (1.5 V), not a current; the fatal current is 10 mA.
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