Verified Solution • 2025–26 Session moderate

QNEET-2019-Ph-797: NEET 2019 Physics - Class 11 NEET-2019-Ph-797 Solution: A copper rod of 88 cm and an aluminium rod of unknown length…

A copper rod of 88 cm and an aluminium rod of unknown length have their increase in length independent of increase in tmperature. The length of aluminium rod is: (αCu=1.7×10−5 K−1\alpha_{Cu} = 1.7 \times 10^{-5}\ K^{-1} and αAl=2.2×10−5 K−1\alpha_{Al} = 2.2 \times 10^{-5}\ K^{-1}) 119.9 cm 88 cm 68 cm 6.8 cm

Multiple Choice Options

  • A 119.9 cm
  • B 88 cm
  • C 68 cm
  • D 6.8 cm

Step-by-Step Verified Solution

At any temperature ( _ l ) C u = ( _ l ) A l l C u _ C u _ T = l A l _ A l _ T _ 88 _ 1.7 _ 10 -5 = l A l _ 2.2 _ 10 �5 _ l A l = 68 cm

Related Learning Resources & Exam Preparation

NEET PYQ Question Bank
Browse year-wise authentic previous years' questions with solutions
Authentic CBT Mock Tests
Simulate official exam environment with live timer and percentile scoring