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Thermal Properties & Thermodynamics
NEET Physics • 10 questions • Free on ExamBattle
Practice Questions
Q1
The efficiency of a Carnot engine operating between 500 K and 300 K is:
- A. 30%
- B. 40%
- C. 50%
- D. 60%
Q2
The first law of thermodynamics states that:
- A. Heat cannot flow from cold to hot body spontaneously
- B. ΔU = Q − W (energy is conserved)
- C. Entropy of the universe always decreases
- D. Work done in an adiabatic process is zero
Q3
A rod of length 2 m has a linear coefficient of expansion α = 2×10⁻⁵ /°C. The increase in length for a 50°C rise is:
- A. 1×10⁻³ m
- B. 2×10⁻³ m
- C. 4×10⁻³ m
- D. 1×10⁻⁴ m
Q4
During an isothermal expansion of an ideal gas:
- A. Temperature increases
- B. Internal energy remains constant
- C. No heat exchange occurs
- D. Pressure remains constant
Q5
The specific heat of water is 4200 J/kg·K. The heat required to raise 2 kg of water from 20°C to 70°C is:
- A. 210 kJ
- B. 420 kJ
- C. 840 kJ
- D. 105 kJ
Q6
Stefan's law of radiation states that the energy radiated per unit area per unit time is proportional to:
- A. T
- B. T²
- C. T³
- D. T⁴
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