JEE Mains Physics 2002-2019 Solved Video Solutions
A long metallic bar is carrying heat from one of its ends to the other end under steady-state. The variation of temperature θ along the length x of the bar from its hot end is best described by which of the following figures?
11
Sep
A long metallic bar is carrying heat from one of its ends to the other end under steady-state. The variation of temperature θ along the length x of the bar from its hot end is best described by which of the following figures? n moles of an ideal gas undergoes a process A and B [...]
100 g of water is heated from 30°C to 50°C. Ignoring the slight expansion of the water, the change in its internal energy is (specific heat of water is 4184 J/kg/K)
11
Sep
100 g of water is heated from 30°C to 50°C. Ignoring the slight expansion of the water, the change in its internal energy is (specific heat of water is 4184 J/kg/K) 100 g of water is heated from 30°C to 50°C. Ignoring the slight expansion of the water the change in its internal energy is [...]
A Carnot engine operating between temperatures T1 and T2 has efficiency 1/6. When T2 is lowered by 62K, its efficiency increases to 1/3. Then T1 and T2 are, respectively
11
Sep
A Carnot engine operating between temperatures T1 and T2 has efficiency 1/6. When T2 is lowered by 62K, its efficiency increases to 1/3. Then T1 and T2 are, respectively A Carnot engine operating between temperatures T1 and T2 has efficiency 1/6. When T2 is lowered by 62K its efficiency increases to 1/3. Then T1 and [...]
The specific heat capacity of a metal at low temperature (T) is given as Cp (kJ K^-1kg-^1) = 32(T/400)^3. A 100 g vessel of this metal is to be cooled from 20 K to 4 K by a special refrigerator operating at room temperature (27°C). The amount of work required to cool the vessel is
11
Sep
The specific heat capacity of a metal at low temperature (T) is given as Cp (kJ K^-1kg-^1) = 32(T/400)^3. A 100 g vessel of this metal is to be cooled from 20 K to 4 K by a special refrigerator operating at room temperature (27°C). The amount of work required to cool the vessel is [...]
A thermally insulated vessel contains an ideal gas of molecular mass M and ratio of specific heats γ. It is moving with speed u and its suddenly brought to rest. Assuming no heat is lost to the surroundings, its temperature increases by
11
Sep
A thermally insulated vessel contains an ideal gas of molecular mass M and ratio of specific heats γ. It is moving with speed u and its suddenly brought to rest. Assuming no heat is lost to the surroundings, its temperature increases by n moles of an ideal gas undergoes a process A and B as [...]
An aluminium sphere of 20 cm diameter is heated from 0^∘C to 100^∘C. Its volume changes by (given that coefficient of linear expansion for aluminium αAI = 23×10^−6/∘C)
11
Sep
An aluminium sphere of 20 cm diameter is heated from 0^∘C to 100^∘C. Its volume changes by (given that coefficient of linear expansion for aluminium αAI = 23×10^−6/∘C) An aluminium sphere of 20 cm diameter is heated from 0^∘C to 100^∘C. Its volume changes by (given that coefficient of linear expansion for aluminium αAI = [...]
A container with insulating walls is divided into two equal parts by a partition fitted with a valve. One part is filled with an ideal gas at a pressure P and temperature T, whereas the other part is completely evacuated . If the valve is suddenly opened, the pressure and temperature of the gas will be
11
Sep
A container with insulating walls is divided into two equal parts by a partition fitted with a valve. One part is filled with an ideal gas at a pressure P and temperature T, whereas the other part is completely evacuated . If the valve is suddenly opened, the pressure and temperature of the gas will [...]
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A container with insulating walls is divided into two equal parts by a partition fitted with a valve. One part is filled with an ideal gas at a pressure P and temperature T ,
the pressure and temperature of the gas will be ,
whereas the other part is completely evacuated . If the valve is suddenly opened ,
A Carnot engine, whose efficiency is 40%, takes in heat from a source maintained at a temperature of 500 K, It is desired to have an engine of efficiency 60%. Then, the intake temperature for the same exhaust (sink) temperature must be
11
Sep
A Carnot engine, whose efficiency is 40%, takes in heat from a source maintained at a temperature of 500 K, It is desired to have an engine of efficiency 60%. Then, the intake temperature for the same exhaust (sink) temperature must be A Carnot engine It is desired to have an engine of efficiency 60%. [...]
Helium gas goes through a cycle ABCDA (consisting of two isochoric and isobaric lines) as shown in figure. Efficiency of this cycle is nearly (Assume the gas to be close to ideal gas)
11
Sep
Helium gas goes through a cycle ABCDA (consisting of two isochoric and isobaric lines) as shown in figure. Efficiency of this cycle is nearly (Assume the gas to be close to ideal gas) Helium gas goes through a cycle ABCDA (consisting of two isochoric and isobaric lines) as shown in figure. Efficiency of this cycle [...]
The given p-V diagram represents the thermodynamic cycle of an engine, operating with an ideal monatomic gas. The amount of heat, extracted from the source in a single cycle is
11
Sep
The given p-V diagram represents the thermodynamic cycle of an engine, operating with an ideal monatomic gas. The amount of heat, extracted from the source in a single cycle is extracted from the source in a single cycle is operating with an ideal monatomic gas. The amount of heat The given p-V diagram represents the [...]