Chapter 15 – Thermodynamics
Sahay Sir > Question Answers > Arihant Physics by D.C Pandey > Volume 1 > Chapter 15 - Thermodynamics
The following graph shows two isotherms for a fixed mass of an ideal gas. The ratio of r.m.s. a speed of the molecules at temperature T1 and T2 is:
05
Sep
The following graph shows two isotherms for a fixed mass of an ideal gas. The ratio of r.m.s. a speed of the molecules at temperature T1 and T2 is: The following graph shows two isotherms for a fixed mass of an ideal gas. The ratio of r.m.s. a speed of the molecules at temperature [...]
wo identical vessels A and B contain masses m and 2m of same gas. The gases in the vessels are heated keeping their volumes constant and equal. The temperature-pressure curve for mass 2m makes angle alpha with T-axis and that and for mass m makes an angle beta with T-axis then
05
Sep
wo identical vessels A and B contain masses m and 2m of same gas. The gases in the vessels are heated keeping their volumes constant and equal. The temperature-pressure curve for mass 2m makes angle alpha with T-axis and that and for mass m makes an angle beta with T-axis then The quantity PV/KT (k [...]
Helium gas is heated at constant pressure by 10 degree C. The percentage of heat energy supplied, which is used in increasing the internal energy of the gas is
05
Sep
Helium gas is heated at constant pressure by 10 degree C. The percentage of heat energy supplied, which is used in increasing the internal energy of the gas is Helium gas is heated at constant pressure by 10 degree C. The percentage of heat energy supplied which is used in increasing the internal energy of [...]
Three identical rods AB,CD and PQ are joined as shown. P and Q are mid points of AB and CD respectively. Ends A,B,C and D are maintained at 0^∘C, 100^∘C, 30^∘C and 60^∘C respectively. The direction of heat flow in PQ is :
05
Sep
Three identical rods AB,CD and PQ are joined as shown. P and Q are mid points of AB and CD respectively. Ends A,B,C and D are maintained at 0^∘C, 100^∘C, 30^∘C and 60^∘C respectively. The direction of heat flow in PQ is : 100^∘C 30^∘C and 60^∘C respectively. The direction of heat flow in PQ [...]
A monoatomic ideal gas is used in a carnot engine as the working substance. If during the adiabatic expansion the volume of the gas increases from (V)/(8) to V, the efficiency of the engine is
05
Sep
A monoatomic ideal gas is used in a carnot engine as the working substance. If during the adiabatic expansion the volume of the gas increases from (V)/(8) to V, the efficiency of the engine is A monoatomic ideal gas is used in a carnot engine as the working substance. If during the adiabatic expansion the [...]
A uniform metallic disc of radius r and mass m is spinning with angular speed omega_(0) about an axis passing through its centre and perpendicular to plane. If its temperature is increased (slightly) by DeltaT its new angular speed is (The coefficient of linear expansion of the metal is alpha)
05
Sep
A uniform metallic disc of radius r and mass m is spinning with angular speed omega_(0) about an axis passing through its centre and perpendicular to plane. If its temperature is increased (slightly) by DeltaT its new angular speed is (The coefficient of linear expansion of the metal is alpha) The quantity PV/KT (k = [...]
A brass boiler has a base area of 0.15m^2 and thickness 1.0 cm. It boils water at the rate of 6.0 kg / min when placed on a gas stove. The temperature of the part of the flame in contact with the boiler is. Thermal conductivity of brass =107.4 Js^−1 m^−1 K^ −1 ; Heat of vaporization of water =2256 × 10^3 Jkg^−1 .
05
Sep
A brass boiler has a base area of 0.15m^2 and thickness 1.0 cm. It boils water at the rate of 6.0 kg / min when placed on a gas stove. The temperature of the part of the flame in contact with the boiler is. Thermal conductivity of brass =107.4 Js^−1 m^−1 K^ −1 ; Heat [...]
Consider isothermal expansion of 0.5 mole of an ideal gas when Q amount of heat is added to it. Following graph shows variation in final volume V with Q. Find the temperature of the gas (ln 3 ≈ 10, R = 3/25 J/mole−K)
05
Sep
Consider isothermal expansion of 0.5 mole of an ideal gas when Q amount of heat is added to it. Following graph shows variation in final volume V with Q. Find the temperature of the gas (ln 3 ≈ 10, R = 3/25 J/mole−K) Consider isothermal expansion of 0.5 mole of an ideal gas when Q [...]
A copper block of mass 2.5 kg is heated in a furnace to a temperature of 500 °C and then placed on a large ice block at (0 degree). What is the maximum amount of ice that can melt? (Specific heat of copper = 0.39 J g^–1 K^–1; heat of fusion of water = 335 J g^–1).
05
Sep
A copper block of mass 2.5 kg is heated in a furnace to a temperature of 500 °C and then placed on a large ice block at (0 degree). What is the maximum amount of ice that can melt? (Specific heat of copper = 0.39 J g^–1 K^–1; heat of fusion of water = 335 [...]
A rod of length 1000 mm and co-efficient of linear expansion α=10^−4 per degree c is placed symmetrically between the two fixed walls separated by 1001 mm. then young’s modulus of the rod is 10^11 N/m^2 . if the temperature is increased by 20 degree C , then the stress develop in the rod is (in N/m^2 )
05
Sep
A rod of length 1000 mm and co-efficient of linear expansion α=10^−4 per degree c is placed symmetrically between the two fixed walls separated by 1001 mm. then young’s modulus of the rod is 10^11 N/m^2 . if the temperature is increased by 20 degree C , then the stress develop in the rod is [...]