In the following question, out of the four alternatives, select the alternative which is the best substitute of the phrase.
To delay or prevent someone or something by obstructing them
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having or showing an interest in learning things; curious.
Like a weak old woman
Out of the four alternatives, choose the one which can be substituted for the given words/sentences and click the button corresponding to it.
One who listens secretly to private conversation
Speech delivered without preparation
The spring balance works on the principle of __________
What is the SI unit of electric current?
What is the unit of the physical quantity Entropy?