1

JEE Advanced 2014 Paper 1 Offline

Numerical

+3

-0

A thermodynamic system is taken from an initial state i with internal energy U

_{i}= 100 J to the final state f along two different paths iaf and ibf, as schematically shown in the figure. The work done by the system along the paths af, ib and bf are W_{af}= 200 J, W_{ib}= 50 J and W_{bf}= 100 J respectively. The heat supplied to the system along the path iaf, ib and bf are Q_{iaf}, Q_{ib}and Q_{bf}respectively. If the internal energy of the system in the state b is U_{b}= 200 J and Q_{iaf}= 500 J, the ratio Q_{bf}/ Q_{ib}isYour input ____

2

IIT-JEE 2011 Paper 1 Offline

Numerical

+3

-0

Steel wire of lenght ‘L’ at 40

^{o}C is suspended from the ceiling and then a mass ‘m’ is hung from its free end. The wire is cooled down from 40^{o}C to 30^{o}C to regain its original length ‘L’. The coefficient of linear thermal expansion of the steel is 10^{−5}/^{o}C, Young’s modulus of steel is 10^{11}N/m^{2}and radius of the wire is 1 mm. Assume that L >> diameter of the wire. Then the value of ‘m’ in kg is nearlyYour input ____

3

IIT-JEE 2010 Paper 1 Offline

Numerical

+3

-0

A piece of ice (heat capacity = 2100 J kg

^{-1}^{o}C^{-1}and latent heat = 3.36 $$ \times $$ 10^{5}J kg^{-1}) of mass m grams is at - 5^{o}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 isYour input ____

4

IIT-JEE 2010 Paper 1 Offline

Numerical

+3

-0

Two spherical bodies A (radius 6 cm ) and B (radius 18 cm ) are at temperature T

_{1}and T_{2}, respectively. The maximum intensity in the emission spectrum of A is at 500 nm and in that of B is at 1500 nm. Considering them to be black bodies, what will be the ratio of the rate of total energy radiated by A to that of B?Your input ____

Questions Asked from Heat and Thermodynamics (Numerical)

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