Q1 · medium · AI-verified
A metal rod of length 1 m expands by 2 mm when heated by 100°C. The coefficient of linear expansion is:
- 2 × 10⁻⁴ /°C
- 2 × 10⁻⁵ /°C
- 2 × 10⁻³ /°C
- 2 × 10⁻⁶ /°C
Q2 · medium · AI-verified
During an adiabatic process, a gas does 500 J of work. The change in internal energy is:
- -500 J
- 500 J
- 0 J
- 1000 J
Q3 · medium · AI-verified
A gas undergoes cyclic process ABCA. If work done by gas in AB is 200 J, in BC is -150 J, and in CA is -100 J, the net work done is:
- 50 J
- -50 J
- 450 J
- 0 J
Q4 · medium · AI-verified
A system absorbs 300 J of heat and does 200 J of work. The change in internal energy is:
- 100 J
- 500 J
- -100 J
- 0 J
Q5 · medium · AI-verified
The efficiency of a Carnot engine operating between temperatures 400 K and 300 K is:
- 25%
- 75%
- 33%
- 66%