ESAT (Engineering and Science Admissions Test) · Physics

Thermal physics

9 practice questions, each with the answer and an explanation.

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Random questions from this topic, one at a time. You see the answer and the explanation straight after each one.

All 9 questions

How much energy is needed to heat $0.50 kg$ of water from $2 0^{\circ} C$ to $6 0^{\circ} C$ ? (Specific heat capacity of water $= 4200 J/kg^{\circ} C$ .)
A sealed rigid container holds gas at $2.0 \times 1 0^{5} Pa$ and $300 K$ . The gas is heated to $600 K$ . What is the new pressure?
A gas occupies $0.0249 m^{3}$ at $1.0 \times 1 0^{5} Pa$ and $300 K$ . How many moles are present? ( $R = 8.31 J/mol K$ )
A heat engine takes in $800 J$ of heat and does $200 J$ of useful work. What is its efficiency?
A fixed mass of gas at constant pressure is heated from $2 7^{\circ} C$ to $12 7^{\circ} C$ . What is the ratio of the final volume to the initial volume?
How much energy is needed to melt $0.20 kg$ of ice already at $0^{\circ} C$ ? (Specific latent heat of fusion of ice $= 334 kJ/kg$ .)
A gas at $100 kPa$ occupies $6.0 litres$ . It is compressed at constant temperature to $2.0 litres$ . What is the new pressure?
The temperature of an ideal gas is raised from $300 K$ to $1200 K$ . By what factor does the r.m.s. speed of its molecules change?
$200 g$ of water at $8 0^{\circ} C$ is mixed with $300 g$ of water at $2 0^{\circ} C$ in an insulated container. What is the final temperature?

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