The internal energy change in a system that has absorbed 2 kcals of heat

⇦

⇨

The internal energy change in a system that has absorbed 2 kcals of heat and done 500J of work is:

Options

(a) 6400 J
(b) 5400 J
(c) 7900 J
(d) 8900 J

Correct Answer:

7900 J

Explanation:

According to first law of thermodynamics Q = ∆U + W
∆U = Q – W = 2 x 4.2 x 1000 – 500 = 8400 – 500 = 7900 J

Related Questions:

1. A block of mass m1 rests on a horizontal table. A light string connected
2. Power dissipated in an LCR series circuit connected to an a.c source of emf ? is
3. A car moving with a velocity of 36 km/hr crosses a siren of frequency 500 Hz.
4. Hard X-rays for the study of fractures in bones should have a minimum wavelength
5. A Carnot engine, having an efficiency of η=1/10 as heat engine, is used

Topics: Thermodynamics (179)
Subject: Physics (2479)

---

Important MCQs Based on Medical Entrance Examinations To Improve Your NEET Score

18000+ students are using NEETLab to improve their score. What about you?

Solve Previous Year MCQs, Mock Tests, Topicwise Practice Tests, Identify Weak Topics, Formula Flash cards and much more is available in NEETLab Android App to improve your NEET score.

---

Share this page with your friends