If 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 minutes
500g of water is heated so that its temperature rises from 30°C to 72°C in 7 minutes. calculate the supplied per minute. (Specific heat capacity of water is 4200Jkg−1K−1
A. 9000J B. 12600J C. 21000J D. 25200J E. 88200J Correct Answer: Option B – 12600J
A body accelerates uniformly from rest at 2ms−². Calculate the velocity after traveling 9m
A. 36m/s B. 18m/s C. 6m/s D. 4.5m/s E. 4.24m/s Correct Answer: Option C – 6m/s
A cell of e.m.f. 1.5V and internal resistance of 2.5Ω is connected in series with an ammeter of resistance 0.5W and a resistor of resistance of 7.0Ω. Calculate the current in the circuit.
A. 0.15A B. 0.20A C. 2.10A D. 3A E. 6.6A Correct Answer: Option A – 3AProducts
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