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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
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Topics: Thermodynamics
(179)
Subject: Physics
(2479)
Important MCQs Based on Medical Entrance Examinations To Improve Your NEET Score
- A transistor is operated in common-emitter configuration at Vᵥ = 2 V such that a change
- An engine pumps water continuously through a hose. Water leaves the hose
- A 1m long wire of diameter 0.31 mm has a resistance of 4.2Ω. If it is replaced by
- The earth radiates in the infrared region of the spectrum. The spectrum is correctly
- Light of frequency 8×10¹⁵ Hz is incident on a substance of photoelectric work
Topics: Thermodynamics (179)
Subject: Physics (2479)
Important MCQs Based on Medical Entrance Examinations To Improve Your NEET Score
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