1
JEE Main 2017 (Offline)
+4
-1
A copper ball of mass 100 gm is at a temperature T. It is dropped in a copper calorimeter of mass 100 gm, filled with 170 gm of water at room temperature. Subsequently, the temperature of the system is found to be 75oC. T is given by: (Given : room temperature = 30oC, specific heat of copper = 0.1 cal/gmoC)
A
825oC
B
800oC
C
885oC
D
1250oC
2
JEE Main 2017 (Offline)
+4
-1
An external pressure P is applied on a cube at 0oC so that it is equally compressed from all sides. K is the bulk modulus of the material of the cube and $$\alpha$$ is its coefficient of linear expansion. Suppose we want to bring the cube to its original size by heating. The temperature should be raised by:
A
$${P \over {3\alpha K}}$$
B
$${P \over {\alpha K}}$$
C
$${3 \alpha \over {P K}}$$
D
3PK$$\alpha$$
3
JEE Main 2017 (Offline)
+4
-1
The temperature of an open room of volume 30 m3 increases from 17oC to 27oC due to the sunshine. The atmospheric pressure in the room remains 1 $$\times$$ 105 Pa. If Ni and Nf are the number of molecules in the room before and after heating, then Nf – Ni will be :
A
- 1.61 $$\times$$ 1023
B
1.38 $$\times$$ 1023
C
2.5 $$\times$$ 1025
D
- 2.5 $$\times$$ 1025
4
JEE Main 2017 (Offline)
+4
-1
CP and Cv are specific heats at constant pressure and constant volume respectively. It is observed that
CP – Cv = a for hydrogen gas
CP – Cv = b for nitrogen gas
The correct relation between a and b is
A
a = 28 b
B
a = 1/14 b
C
a = b
D
a = 14 b
EXAM MAP
Medical
NEET