In the following question, out of the four alternatives, select the alternative which best expresses the meaning of the idiom/phrase.
Achilles' heel
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To go off the air
If a chord of a circle subtends an angle of 30° at the circumference of the circle, then what is the ratio of the radius of the circle and the length of the chord respectively?
Who killed Mahatma Gandhi?
Who wrote the book "Five Point Someone: What Not to Do at IIT"?
Who was given the title of "The Ambassador of Hindu – Muslim Unity" for being the architect and mastermind of the historic Lucknow Pact?
Rajendra I was the son of?
The apparent weight of a person in a lift which is moving down with uniform acceleration is _______.