MTG NEET Physics
Two metallic rods PQ and QR of different materials are joined together at the junction Q (see figure). It is observed that if the ends P and R are kept at 100^o C and 0^o C respectively, the temperature of the junction Q is 60^o C, there is no loss of heat to the surroundings. The rod QR is replace by another rod QR ′ of the same material and length (QR = QR′ ). If the area of cross-section of QR′ is twice that of QR and the ends P and R ′ are maintained at 100^o C and 0^o C respectively, the temperature of the junction Q will be nearly
19
Nov
Two metallic rods PQ and QR of different materials are joined together at the junction Q (see figure). It is observed that if the ends P and R are kept at 100^o C and 0^o C respectively, the temperature of the junction Q is 60^o C, there is no loss of heat to the surroundings. [...]
A cylinder of radius R made of a material of thermal conductivity K1, is surrounded by a cylindrical shell of inner radius R and outer radius 2R made of a material of thermal conductivity K2. The two ends of the combined system are maintained at two different temperatures. There is no loss of heat across the cylindrical surface and the system is in steady state. The effective thermal conductivity of the system is
19
Nov
A cylinder of radius R made of a material of thermal conductivity K1, is surrounded by a cylindrical shell of inner radius R and outer radius 2R made of a material of thermal conductivity K2. The two ends of the combined system are maintained at two different temperatures. There is no loss of heat across [...]
A body of A mass 0.5kg and specific heat 0.85 at temperature 60degree celsius. Another body B of mass 0.3kg and specific heat 0.9 at temperature of 90 degree celsius when they are connected through a conducting rod heat will flow from
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Nov
A body of A mass 0.5kg and specific heat 0.85 at temperature 60degree celsius. Another body B of mass 0.3kg and specific heat 0.9 at temperature of 90 degree celsius when they are connected through a conducting rod heat will flow from The latent heat of vaporisation of a substance is always November 19, 2020 [...]
Two identical rectangular rods of metal are welded end to end as shown in figure (a) and 10 j of heat flow through the rods in 2.00 min. How long would it take for 30 j of heat to flow through the rods if they are welded as shown in figure (b) ?
19
Nov
Two identical rectangular rods of metal are welded end to end as shown in figure (a) and 10 j of heat flow through the rods in 2.00 min. How long would it take for 30 j of heat to flow through the rods if they are welded as shown in figure (b) ? The latent [...]
Two metal rods 1 and 2 of same lengths have same temperature difference between their ends. Their thermal conductivities are K1 and K2 and cross sectional areas A1 and A2 respectively. If the rate of heat conduction in 1 is four times that in 2, then
19
Nov
Two metal rods 1 and 2 of same lengths have same temperature difference between their ends. Their thermal conductivities are K1 and K2 and cross sectional areas A1 and A2 respectively. If the rate of heat conduction in 1 is four times that in 2, then The latent heat of vaporisation of a substance is [...]
The coefficient of thermal conductivity of copper is 9 times that of steel. In the composite cylindrical bar shown in the figure, what will be the temperature at the junction of copper and steel ?
19
Nov
The coefficient of thermal conductivity of copper is 9 times that of steel. In the composite cylindrical bar shown in the figure, what will be the temperature at the junction of copper and steel ? The coefficient of thermal conductivity of copper is 9 times that of steel. In the composite cylindrical bar shown in [...]
The amount of heat conducted out per second through a window, when inside temperature is 10∘C and outside temperature is −10∘C, is 1000 J. Same heat will be conducted in through the window, when outside temperature is −23∘C and inside temperature is:
19
Nov
The amount of heat conducted out per second through a window, when inside temperature is 10∘C and outside temperature is −10∘C, is 1000 J. Same heat will be conducted in through the window, when outside temperature is −23∘C and inside temperature is: is 1000 J. Same heat will be conducted in through the window The [...]
How much work can be obtained from 100 calories of heat energy?
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Nov
How much work can be obtained from 100 calories of heat energy? How much work can be obtained from 100 calories of heat energy? November 19, 2020 Category: Chapter 16 - Calorimetry and Heat Transfer , MTG NEET Physics , Part 1 ,
A piece of ice (heat capacity =2100J kg^−1 ∘C^−1 and latent heat =3.36×10^5Jkg^−1) of mass m grams is at −5∘C at atmospheric pressure. It is given 420 J of heat so that the ice starts melting. Finally when the ice . Water mixture is in equilibrium, it is found that 1 gm of ice has melted. Assuming there is no other heat exchange in the process, the value of m is
19
Nov
A piece of ice (heat capacity =2100J kg^−1 ∘C^−1 and latent heat =3.36×10^5Jkg^−1) of mass m grams is at −5∘C at atmospheric pressure. It is given 420 J of heat so that the ice starts melting. Finally when the ice . Water mixture is in equilibrium, it is found that 1 gm of ice has [...]
The sprinkling of water reduces slightly the temperature of a closed room because
19
Nov
The sprinkling of water reduces slightly the temperature of a closed room because The sprinkling of water reduces slightly the temperature of a closed room because November 19, 2020 Category: Chapter 16 - Calorimetry and Heat Transfer , MTG NEET Physics , Part 1 ,