JEE Mains Physics 2002-2019 Solved Video Solutions
Two rods A and B of identical dimensions are at temperature 30 ºC. If A is heated upto 180 ºC and B upto T ºC, then the new lengths are the same. If the ratio of the coefficients of linear expansion of A and B is 4 : 3, then the value of T is
11
Sep
Two rods A and B of identical dimensions are at temperature 30 ºC. If A is heated upto 180 ºC and B upto T ºC, then the new lengths are the same. If the ratio of the coefficients of linear expansion of A and B is 4 : 3, then the value of T is [...]
Ice at -20 c is added to 50g of water at 40 when the temperature of mixture reached 0 C, It is found that 20 g of ice is still unmelted. The amount of ice added to the water was close to
11
Sep
Ice at -20 c is added to 50g of water at 40 when the temperature of mixture reached 0 C, It is found that 20 g of ice is still unmelted. The amount of ice added to the water was close to Ice at -20 c is added to 50g of water at 40 when [...]
An unknown metal of mass 192 g heated to a temperature of 100ºC was immersed into a brass calorimeter of mass 128 g containing 240 g of water at a temperature of 8.4 ºC. Calculate the specific heat of the unknown metal. If water temperature stabilizes at 21.5 ºC. (Specific heat of brass is 394 J kg^–1 K^–1)
11
Sep
An unknown metal of mass 192 g heated to a temperature of 100ºC was immersed into a brass calorimeter of mass 128 g containing 240 g of water at a temperature of 8.4 ºC. Calculate the specific heat of the unknown metal. If water temperature stabilizes at 21.5 ºC. (Specific heat of brass is 394 [...]
A heat source at T = 10^3 K is connected to another heat reservoir at T = 10^2 K by a copper slab which is 1 m thick. Given that the thermal conductivity of copper is 0.1 WK^–1 m^–1, the energy flux through it in the steady state is
11
Sep
A heat source at T = 10^3 K is connected to another heat reservoir at T = 10^2 K by a copper slab which is 1 m thick. Given that the thermal conductivity of copper is 0.1 WK^–1 m^–1, the energy flux through it in the steady state is A heat source at T = [...]
Three Carnot engines operate in series between a heat source at a temperature T1 and a heat sink at temperature T4 (see figure). There are two other reservoirs at temperature T2 and T3 , as shown, with T1 > T2 > T3 > T4. The three engines are equally efficient if
11
Sep
Three Carnot engines operate in series between a heat source at a temperature T1 and a heat sink at temperature T4 (see figure). There are two other reservoirs at temperature T2 and T3 , as shown, with T1 > T2 > T3 > T4. The three engines are equally efficient if as shown Three Carnot [...]
Temperature difference of 120 C is maintained between two ends of a uniform rod AB of length 2L. Another bent rod PQ, of same cross-section as AB and length (3L)/(2), is connected across AB (See figure). In steady state, temperature difference between P and Q will be close to
11
Sep
Temperature difference of 120 C is maintained between two ends of a uniform rod AB of length 2L. Another bent rod PQ, of same cross-section as AB and length (3L)/(2), is connected across AB (See figure). In steady state, temperature difference between P and Q will be close to is connected across AB (See figure). [...]
Two Carnot engines A and B are operated in series. The engine A receives heat from the source at temperature T1 and rejects the heat to the sink at temperature T. The second engine B receives the heat at temperature T and rejects to its sink at temperature T2. For what value of T the efficiencies of the two engines are equal
11
Sep
Two Carnot engines A and B are operated in series. The engine A receives heat from the source at temperature T1 and rejects the heat to the sink at temperature T. The second engine B receives the heat at temperature T and rejects to its sink at temperature T2. For what value of T the [...]
A gas can be taken from A to B via two different processes ACB and ADB . When path ACB is used 60J of heat flows into the system and 30J of work is done by the system. If path ADB is used work done by the system is 10J. The heat Flow into the system in path ADB is :
11
Sep
A gas can be taken from A to B via two different processes ACB and ADB . When path ACB is used 60J of heat flows into the system and 30J of work is done by the system. If path ADB is used work done by the system is 10J. The heat Flow into the [...]
A diatomic gas with rigid molecules does 10 J of work when expanded at constant pressure. What would be the heat energy absorbed by the gas, in this process ?
11
Sep
A diatomic gas with rigid molecules does 10 J of work when expanded at constant pressure. What would be the heat energy absorbed by the gas, in this process ? A diatomic gas with rigid molecules does 10 J of work when expanded at constant pressure. What would be the heat energy absorbed by the [...]
A sample of an ideal gas is taken through the cyclic process abca as shown in the figure. The change in the internal energy of the gas along the path ca is –180 J. The gas absorbs 250 J of heat along the path ab and 60 J along the path bc. The work done by the gas along the path abc is:
11
Sep
A sample of an ideal gas is taken through the cyclic process abca as shown in the figure. The change in the internal energy of the gas along the path ca is –180 J. The gas absorbs 250 J of heat along the path ab and 60 J along the path bc. The work done [...]