PHYSICS TEMPERATURECBT

PHYSICS CBT – TEMPERATURE & PRESSURE (1–40)

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Theory Questions (Click to View Answers)

1. Draw and label a liquid-in-glass thermometer.

Correction: Include scale markings, mercury/alcohol column, bulb, and tube.

2. A gas in a sealed container at 2 atm is heated from 300K to 450K. Calculate the new pressure.

Correction: P2 = P1×(T2/T1) = 2×(450/300) = 3 atm

3. A solid rod of length 1 m has α = 1.2×10⁻⁵ /°C. If heated by 50°C, find expansion.

Correction: ΔL = α×L×ΔT = 1.2×10⁻⁵ ×1×50 = 0.0006 m = 0.6 mm

4. Draw a thermocouple setup showing junction, metals, and voltage output.

Correction: Diagram: Metal A + Metal B junction → voltage measurement device → temperature proportional.

5. A gas at 1.5 atm is heated from 200K to 400K at constant volume. Find final pressure.

Correction: P2 = P1×(T2/T1) = 1.5 × (400/200) = 3 atm