NEET UG 2017 · Physics · Question 11
NEET 2017 Physics, question 11
Question 11 of the NEET 2017 paper (code A) is a Physics question from Thermal Properties of Matter. Its idea, Conduction through Composite Rods, was asked twice, in 2017 and 2025, across NEET 2017–2026. The CBSE official answer key gives option 1.
Updated 2026-10-08
Q11 · Physics
Two rods A and B of different materials are welded together as shown in figure. Their thermal conductivities are and . The thermal conductivity of the composite rod will be :
The figure, described in words
Rods A (K1) and B (K2) of equal length d placed one above the other (in parallel) between temperatures T1 and T2.
- 1Official answer
- 2
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Official answer: option 1 · CBSE official answer key
Same idea
Conduction through Composite Rods, in other papers
NEET asked this idea twice, in 2017 and 2025. The other question below.
- 2025 Q19Three identical heat conducting rods are connected in series as shown in the figure. The rods on the sides have thermal conductivity …Numerical · Medium
Conduction through Composite Rods: every question and how it was framed
The chapter
Thermal Properties of Matter in ten years of NEET
10 questions from 2017–2026, asked in 8 of 10 papers, about 1.0 a paper. Heat Transfer and Thermal Expansion alone had 8.