During radiation, having non conducting medium between two surface may reduce transfer of heat.
Temperature at which person can feel metal rod and wooden block to be equally hot is

During radiation, having non conducting medium between two surface may reduce transfer of heat. Two thin blankets are better than one thick blanket in controlling effect of cold air since.

During radiation, having non conducting medium between two surface may reduce transfer of heat. Two spheres of emissive power 0.6 and 0.8 and radii 2cm and 4cm are heated to 27^(@)C and 127^(@)C and placed in room of temperature 0K . The ratio of heat radiated per second is

The graph shows how temperature varies with distance along a well-insulated metal rod which is conducting thermal energy at a steady rate. The slope of this graph is the temperature gradient. There is an analogy between electrical conduction and thermal energy conduction. If an equivalent electrical-graph were to be drawn, which electrical quantity,when plotted against distance along the rod, would have the slope shown. ?

A cylindrical container having non-conducting walls is partitioned in two equal parts such that the volume of the each parts is eqaul to V_(0) A movable non-conducting piston is kept between the two parts. Gas on left is slowly heated so that the gas on right is compressed upto volume V_(0)//8 . Find pressure and temperature on both sides if initial pressure and temperature, were P_(0) and T_(0) respectively. Also find heat given by the heater to the gas (number of moles in each parts is n)

A cylindrical container having non-conducting walls is partitioned in two equal parts such that the volume of the each parts is eqaul to V_(0) A movable non-conducting piston is kept between the two parts. Gas on left is slowly heated so that the gas on right is compressed upto volume V_(0)//8 . Find pressure and temperature on both sides if initial pressure and temperature, were P_(0) and T_(0) respectively. Also find heat given by the heater to the gas (number of moles in each parts is n)

Two metal rods X and Y having equal cross-sectional areas are joined in series. One end of which is heated. After some time, the temperature gradient along each rod is foound to be uniform, but greater in X than that in Y. Which of the following can be inferred

Two metal rods X and Y having equal cross-sectional areas are joined in series. One end of which is heated. After some time, the temperature gradient along each rod is foound to be uniform, but greater in X than that in Y. Which of the following can be inferred

The two ends of a uniform rod of thermal conductivity k are maintained at different but constant temperatures. The temperature gradientat any point on the rod is (d theta)/(dl) (equal to the difference in temperature per unit length). The heat flow per unit time per unit cross-section of the rod is l then which of the following statements is/are correct:

The two ends of a uniform rod of thermal conductivity k are maintained at different but constant temperatures. The temperature gradientat any point on the rod is (d theta)/(dl) (equal to the difference in temperature per unit length). The heat flow per unit time per unit cross-section of the rod is l then which of the following statements is/are correct:

Read the following paragraph carefully and answer the following question . If the heat is exchanged between a hot and cold object, the temperature of the cold object goes on increasing due to gain of energy and the temperature of the hot object goes on decreasing due to loss of energy . The change in temperature continues till the temperatures of both the the object attain the same value . In the process, the cold object gains heat energy and the hot objet lose heat energy . If the system of both the object is isolated from the environment by keeping it inside a heat resistance box ( meaning that the energy exchange takes place between the two object only), then no energy can flow from inside the box or come into the box. Heat is transferred from where to where ?