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Exam
NEET
Subject
Physics
Chapter
Thermal Properties of Matter

NEET · Physics · Thermal Properties of Matter

( Column-I Column-II (A) Thermal conductivity (q) Slightly...

(
Column-IColumn-II
(A)Thermal conductivity(q)Slightly increases
of a bodywith increase
in temperature
(B)Flow of heat due to(p)Convection
actual motion of
the material in a body
(C)The graph between(s)Straight line
temperature difference
between the ends of rod
and its length
(D)For perfectly black body,(r)1
'e' =
)

Options

  1. Aa-p b-r c-s d-q
  2. Ba-p b-s c-r d-q
  3. Ca-q b-r c-s d-p
  4. Da-q b-p c-s d-r

Correct answer

D. a-q b-p c-s d-r

Step-by-step solution

Flow of heat due to actual motion of particles is called convection. (dq\mathrm{dq}/ dt=KA(T\mathrm{dt}=\mathrm{KA}(\mathrm{T}2-T\mathrm{T}1) / L\mathrm{L}), by law of heat transfer. If heat transfer remains same difference in temperature is directly proportional to length of rod. Therefore the graph between them is a straight line. For a perfect black body emissivity (e) = 1 (Kirrchoff's law)
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