Quantrex Quantrex AcademyJEE · NEET · NDA PYQs with solutions Open app
NTA Abhyas JEE Main2020PhysicsThermal Properties of MatterPractice

Three rods of material x and three rods of material y of identical length and cross sectional area are connected as shown in the figure. If the end A is maintained at 60 ∘ C and the junction E at 10 ∘ C , then the temperature of junction C is [Given the thermal conductivity of x is 0.92   W / m . K and that of y is 0.46   W / m . K ]

Options

  1. A10 ∘   C
  2. B20 ∘   C
  3. C30 ∘   C
  4. D40 ∘   C

Correct answer

B. 20 ∘   C

Step-by-step solution

Treating the given network of rods in terms of thermal resistance R x and R y with R x = L A × 0.92 and R y = L A × 0.46 as R = L AK so that if R x = R, R y = 2R x = 2R Now as in this bridge [(P/Q) = (R/S)], so the bridge is balanced, i.e., the temperature at junctions C and D is equal and the rod CD becomes ineffective as no heat will flow through it. Now as the thermal resistance of the bridge between junctions B and E is 1 R BE = 1 R + R + 1 2R + 2R , i.e., R BE = 4 3 R The total resistance of bridge between A a

Practice Thermal Properties of Matter on Quantrex Academy →

More from Thermal Properties of Matter

As shown in the figure, an insulated container is fitted with a thermally conducting but immovable partition (P₁) and a freely movable but thermally insulated piston (P₂) . The par 2026The heat extracted out of x gram of water initially at 50°C to cool it down to 0°C is sufficient to evaporate (1000 - x) gram of water also initially at 50°C . The value of x (clos 2026The temperature of a metal strip having coefficient of linear expansion is increased from T₁ to T₂ resulting in increase of its length by L₁ . The temperature is further increased 2026Which of the following best represents the temperature versus heat supplied graph for water, in the range of -20^ C to 120^ C ? 202610 kg of ice at -10^ C is added to 100 kg of water to lower its temperature from 25 ^ C . Consider no heat exchange to surroundings. The decrement to the temperature of water is _ 2026A brass wire of length 2 m and radius 1 mm at 27^ C is held taut between two rigid supports. Initially it was cooled to a temperature of -43^ C creating a tension T in the wire. Th 2026Rods x and y of equal dimensions but of different materials are joined as shown in figure. Temperatures of end points A and F are maintained at 100^ C and 40^ C respectively. Given 2026An aluminium and steel rods having same lengths and cross-sections are joined to make total length of 120 cm at 30^ C . The coefficient of linear expansion of aluminium and steel a 2026 Full Thermal Properties of Matter list All NTA Abhyas JEE Main PYQs