JEE Advanced 2016 Paper 1 Offline | Heat and Thermodynamics Question 37 | Physics

1

JEE Advanced 2016 Paper 1 Offline

MCQ (Single Correct Answer)

+3

-1

A water cooler of storage capacity 120 litres can cool water at a constant rate of P watts. In a closed circulation system (as shown schematically in the figure), the water from the cooler is used to cool an external device that generates constantly 3 kW of heat (thermal load).
The temperature of water fed into the device cannot exceed 30°C and the entire stored 120 litres of water is initially cooled to 10°C. The entire system is thermally insulated. The minimum value of P (in watts) for which the device can be operated for 3 hours is : JEE Advanced 2016 Paper 1 Offline Physics - Heat and Thermodynamics Question 38 English

JEE Advanced 2016 Paper 1 Offline Physics - Heat and Thermodynamics Question 38 English

(Specific heat of water is 4.2 kJ kg⁻¹ K⁻¹ and the density of water is 1000 kg m⁻³)

A

1600

B

2067

C

2533

D

3933

2

JEE Advanced 2014 Paper 2 Offline

MCQ (Single Correct Answer)

+3

-1

Parallel rays of light of intensity $$I$$ = 912 Wm^–2 are incident on a spherical black body kept in surroundings of temperature 300 K. Take Stefan-Boltzmann constant $$\sigma $$ = 5.7 $$ \times $$ 10^–8 Wm^–2K^–4 and assume that the energy exchange with the surroundings is only through radiation. The final steady state temperature of the black body is close to

A

330 K

B

660 K

C

990 K

D

1550 K

3

JEE Advanced 2014 Paper 2 Offline

MCQ (Single Correct Answer)

+3

-1

In the figure a container is shown to have a movable (without friction) piston on top. The container and the piston are all made of perfectly insulating material allowing no heat transfer between outside and inside the container. The container is divided into two compartments by a rigid partition made of a thermally conducting material that allows slow transfer of heat. The lower compartment of the container is filled with 2 moles of an ideal monatomic gas at 700 K and the upper compartment is filled with 2 moles of an ideal diatomic gas at 400 K. The heat capacities per mole of an ideal monatomic gas are $${C_v} = {3 \over 2}R$$, $${C_p} = {5 \over 2}R$$, and those for an ideal diatomic gas are $${C_v} = {5 \over 2}R$$, $${C_p} = {7 \over 2}R$$.

JEE Advanced 2014 Paper 2 Offline Physics - Heat and Thermodynamics Question 27 English Comprehension

Consider the partition to be rigidly fixed so that it does not move. When equilibrium is achieved, the final temperature of the gases will be

A

550 K

B

525 K

C

513 K

D

490 K

4

JEE Advanced 2014 Paper 2 Offline

MCQ (Single Correct Answer)

+3

-1

In the figure a container is shown to have a movable (without friction) piston on top. The container and the piston are all made of perfectly insulating material allowing no heat transfer between outside and inside the container. The container is divided into two compartments by a rigid partition made of a thermally conducting material that allows slow transfer of heat. The lower compartment of the container is filled with 2 moles of an ideal monatomic gas at 700 K and the upper compartment is filled with 2 moles of an ideal diatomic gas at 400 K. The heat capacities per mole of an ideal monatomic gas are $${C_v} = {3 \over 2}R$$, $${C_p} = {5 \over 2}R$$, and those for an ideal diatomic gas are $${C_v} = {5 \over 2}R$$, $${C_p} = {7 \over 2}R$$.

JEE Advanced 2014 Paper 2 Offline Physics - Heat and Thermodynamics Question 26 English Comprehension

Now consider the partition to be free to move without friction so that the pressure of gases in both compartments is the same. Then total work done by the gases till the time they achieve equilibrium will be

A

250 R

B

200 R

C

100 R

D

$$-$$100 R