A solid metal cube of side 10cm is heated from 10°C to 60°C. lf the linear expansivity of the metal is 1.2 x 10^5K−¹, calculate the increase in its volume.
A. 0.6cm³ B. 1.2 cm³ C. 1.8 cm³ D. 3.6 cm³ E. 6.0cm³ Correct Answer: Option C – 1.8 cm³ Explanation Δv = 3αvΔθ = 3 x 1.2 x 10^-5 x 1000 X (60 – 10) = 1.8cm
The expansion of solids can be considered a disadvantage in the?
A. fire alarm system B. thermostat C. riveting of steel plates D. balance wheel of a watch E. fitting of wheels on rims. Correct Answer: Option D – balance wheel of a watchIf the temperature of water is gradually increased from 0° to 4°C, the density of the water within this range?
A. increases for a while and then decreases B. decreases for a while and then increases C. increases gradually D. decreases gradually E. remains the same Correct Answer: Option C – increases gradually
Calculate the time taken to heat 2kg of water from 50°C to 100°C in an electric kettle taking 5A, from a 210V supply. (Specific heat capacity of water = 4200kg−¹K−¹
A. 2.5 minutes B. 5.7 minutes C. 6.7 minutes D. 7.5 minutes E. 9.5 minutes Correct Answer: Option C – 6.7 minutesProducts
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