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Thermal Properties of Matter

JEE Main 2025 (Online) 22nd January Morning ShiftMCQEasy📈 Topic in 5% papers+4−1
Ques. 1JEE Main 2025, 22 January (Morning Shift)

Two spherical bodies of same materials having radii 0.2 m and 0.8 m are placed in same atmosphere. The temperature of the smaller body is 800 K and temperature of the bigger body is 400 K . If the energy radiated from the smaller body is E, the energy radiated from the bigger body is (assume, effect of the surrounding temperature to be negligible),

  1. 64 E
  2. 16 E
  3. E
  4. 256 E

Answer

(3) E

Solution

Stefan's law: E AT4 r2T4 (same material, same time).

E'E= ( 0.80.2 )2 ( 400800 )4=16 116=1

E'=E

Answer: (3)

Keep practising — Thermal Properties of Matter

Ques. 2JEE Main 2025, 22 January (Morning Shift)

An amount of ice of mass 10-3 kg and temperature -10 C is transformed to vapour of temperature 110 C by applying heat. The total amount of work required for this conversion is, (Take, specific heat of ice =2100 J kg-1 K-1, specific heat of water =4180 J kg-1 K-1, specific heat of steam =1920 J kg-1 K-1, Latent heat of ice =3.35 105 J kg-1 and Latent heat of steam =2.25 106 J kg-1 )

  1. 3022 J
  2. 3043 J
  3. 3003 J
  4. 3024 J
Ques. 3JEE Main 2025, 22 January (Morning Shift)

Three conductors of same length having thermal conductivity k1,k2 and k3 are connected as shown in figure. [figure] Area of cross sections of 1st and 2nd conductor are same and for 3rd conductor it is double of the 1st conductor. The temperatures are given in the figure. In steady state condition, the value of is . (Given : k1=60 Js-1 m-1 K-1, k2=120 Js-1 m-1 K-1, k3=135 Js-1 m-1 K-1 )

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