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What force should be applied to the ends of steel rod of a cross sectional area 10 cm² to prevent it from elongation when heated from 273 K to 303 K?

(a of steel 10-5 °C-1,

Y = 2 * 10 ^ 11 * N * m ^ - 2 )

(a) 2 * 10 ^ 4 * N

(b) 3 * 10 ^ 4 * N

(c) 6 * 10 ^ 4 * N

(d) 12 * 10 ^ 4 * N

Chapter :- Thermal Properties of Matter

PW module solution

class 11th

A metal sheet having size of 0.6 x 0.5 m² is heated from 293 K to 520° C. The final area of the hot sheet is

[a of metal = 2 × 10-5/°C]

(a) 0.306 m²

(b) 0.0306 m²

(c) 3.06 m²

(d) 1.02 m²

A clock with an iron pendulum keeps correct time at 15°C. If the room temperature rises to 20°C, the error in seconds per day will be (coefficient of linear expansion for iron is 0.000012/°C)

(a) 2.5sec

(b) 2.6sec

(c) 2.4sec

(d) 2.2sec