# A system is given 400 calories of heat and it does 800 joules of work. How much does the internal energy of the system change in this process (J = 4.18 joules/cal) Option 1) 2472 J Option 2) 872 J Option 3) 654 J Option 4) 2944 J

As we discussed in concept

First law of Thermodynamics -

Heat imported to a body in is in general used to increase internal energy and work done against external pressure.

- wherein

Q = 400 cal = 400 x 4.18 J

= 1672 J

W = 800 J

Option 1)

2472 J

This option is incorrect.

Option 2)

872 J

This option is correct.

Option 3)

654 J

This option is incorrect.

Option 4)

2944 J

This option is incorrect.

### Preparation Products

##### Knockout BITSAT 2021

It is an exhaustive preparation module made exclusively for cracking BITSAT..

₹ 4999/- ₹ 2999/-
##### Knockout BITSAT-JEE Main 2021

An exhaustive E-learning program for the complete preparation of JEE Main and Bitsat.

₹ 27999/- ₹ 16999/-
Boost your Preparation for JEE Main 2021 with Personlized Coaching

Exams
Articles
Questions