Viewfinders, used in automobiles to locate the position of the vehicles behind, are made of

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Q: 79 (CDS-I/2011)
Viewfinders, used in automobiles to locate the position of the vehicles behind, are made of
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question_subject: 

Science

question_exam: 

CDS-I

stats: 

0,31,28,4,19,31,5

keywords: 

{'viewfinders': [0, 0, 0, 1], 'plane mirror': [0, 0, 0, 7], 'convex mirror': [0, 0, 0, 3], 'concave mirror': [0, 0, 2, 6], 'parabolic mirror': [0, 0, 0, 1], 'vehicles': [0, 0, 1, 8], 'automobiles': [1, 0, 4, 2]}