NTA Abhyas JEE Main2020PhysicsThermodynamicsPractice
Two identical calorimeters A and B contain an equal quantity of water at 20 ° C . A 5 g piece of metal X of specific heat 0.2 c a l g - 1 ° C - 1 is dropped into A and 5 g piece of metal Y is dropped into B . The equilibrium temperature in A is 22 ° C and that in B is 23 ° C . The initial temperature of both the metals was 40 ° C . The specific heat of metal Y (in c a l g - 1 ° C - 1 ) is
Options
- A27 85
- B54 85
- C81 85
- D0.4
Correct answer
A. 27 85
Step-by-step solution
F o r X : 5 × 0.2 × ( 40 - 22 ) = m × C × 22 - 20 F o r Y : 5 × C × ( 40 - 23 ) = m × C × ( 23 - 20 ) ⇒ C = 27 85