MAHE Manipal B.Sc Nursing 2025
ApplyAccorded Institution of Eminence by MoE, Govt. of India | NAAC A++ Grade | Ranked #4 India by NIRF 2024
Law of Thermal Conductivity is considered one of the most asked concept.
14 Questions around this concept.
The two ends of a metal rod are maintained at temperatures 100°C and 110°C. The rate of heat flow in the rod is found to be 4.0 J/s. If the ends are maintained at temperatures 200°C and 210°C, the rate of heat flow will be:
The unit of thermal conductivity is :
A slab of stone of area 0.36 m2 and thickness 0.1 m is exposed on the lower surface to steam at 100 °C. A block of ice 0 °C rests on the upper surface of the slab. In one hour 4.8 kg of ice is melted. The thermal conductivity of slab is:
(Given latent heat of fusion of ice = 3.36 x 105 J kg-1)
NEET 2025: Biology: Mind Maps & Important Diagrams | Mock Test (Free)
NEET 2025: Syllabus | Most Scoring concepts | NEET PYQ's (2015-24)
New: Meet Careers360 experts in your city and get guidance on shortlisting colleges
New Programme: B.E. Environmental & Sustainability @ BITS Pilani for PCB Candidates
Three rods of Copper, Brass and Steel are welded together to form a Y - shaped structure. Area of cross - section of each rod = 4 cm2. End of copper rod is maintained at 1000C where as ends of brass and steel are kept at 00C. Lengths of the copper, brass and steel rods are 46, 13 and 12 cms respectively. The rods are thermally insulated from surroundings except at ends. Thermal conductivities of copper, brass and steel are 0.92, 0.26 and 0.12 CGS units respectively. Rate of heat flow through copper rod is :
Two rods, one semi-circular of thermal conductivity
Two rods A and B of different materials are welded together. Their thermal conductivities are
Temperature difference of
A cylindrical metallic rod in thermal contact with two reservoirs of heat at its two ends conducts an amount of heat Q in time t. The metallic rod is melted and the material is formed into a rod of half the radius of the original rod. What is the amount of heat conducted by the new rod, when placed in thermal contact with the two reservoirs in time t?
Enlargement of cotyledons is an indication of
Law of Thermal Conductivity -
So, from the above equation we can calculate the- Rate of flow of heat i.e. heat current which can be written as -
In the differential form, this heat current can also be written as -
In the case of a non-steady state or variable cross-section, this is the more general equation that can be used to solve problems.
Relation of thermal conductivity of some material -
Thermal resistance
"Stay in the loop. Receive exam news, study resources, and expert advice!"