A) \[{{45}^{o}}\]
B) \[{{30}^{o}}\]
C) \[{{60}^{o}}\]
D) \[{{0}^{o}}\].
Correct Answer: D
Solution :
\[\overrightarrow{P}.\overrightarrow{Q}=PQ\] \[\Rightarrow \] \[PQ\cos \theta =PQ\] \[\Rightarrow \] \[\cos \theta =1\] \[\Rightarrow \] \[\theta ={{0}^{o}}\]
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