Ek bar ek student Physics practical ki exam de raha tha, External (teacher) ne uske paas akar puchha
Teacher :What is called energy?
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Student :chup chap khada raha.
Teacher :kya kuch bhi nahin jante?
Student :sir thoda thoda janta hun,
Teacher :Vahi batao,
Student : sir shuru ka yaad nahin aa raha,
Teacher :Jo yaad hai vahi batao,
Student :Sir end ka yaad hai,
Teacher :Vahi batao,
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Student: ..that is called Energy.