Physics

1Gaps are left between lengths of railway line to

2Telephone wires are left slack in hot weather so that they

3A metal rod 2 m long with linear expansivity 1.2 × 10⁻⁵ K⁻¹ is heated through 50 K. Its expansion is

4A bimetallic strip bends when heated because the two metals

5A brass ring of diameter 4.99 cm at 20 °C is heated to fit a 5.00 cm rod. If α = 2 × 10⁻⁵ /K, the temperature rise needed is about

6Gaps are left between railway lines to

7A gas expands more than a solid when heated because

8A bimetallic strip is used in a thermostat because

9Water has its greatest density at

10A steel rod 1 m long at 20 °C is heated to 120 °C. If α = 1.2 × 10⁻⁵ /K, the new length is