2. Sample Papers
  3. NEET

NEET Sample Paper NEET Sample Test Paper-3

  • question_answer
    At what temperature will the resistance of a copper wire become three times its value at \[{{0}^{o}}C\]? (Temperature coefficient of resistance for copper \[=4\times {{10}^{-3}}pe{{r}^{o}}C\])?

    A)  \[{{400}^{o}}C\]                    

    B)  \[{{450}^{o}}C\]

    C)  \[{{500}^{o}}C\]                    

    D)  \[{{550}^{o}}C\]    

    Correct Answer: C

    Solution :

        By using, \[{{R}_{t}}={{R}_{0}}(1+a\,\Delta t)\] According to the question, \[3\times {{R}_{0}}={{R}_{0}}(1+4\times {{10}^{-3}}\Delta t)\]             \[\Rightarrow \]                \[\Delta r={{500}^{o}}C\] final temperature \[=500+0={{500}^{o}}C\]


You need to login to perform this action.
You will be redirected in 3 sec spinner