![On a fairly cool rainy day when the temperature is 20°C; the length of a steel railroad track is 20m. What will be its length on a hot a dry day when the temperature is 40°C? [coefficient of linear expansion of steel = 11 x 10^-6K‾¹]](https://erudites.ng/wp-content/uploads/2020/06/past-questions-and-answers.jpg)
by Sunday | Nov 14 | Physics JAMB
A. 20.013m B. 20.009m C. 20.004m D. 20.002m Correct Answer: Option C – 20.004m Explanation The increase in length of the steel rail is given by = α 10 = 11 x 10-6 x 20 x (40 -20) = 11 x 10-6 x 20 x 20 = 4.4 x 10-3 ∴ Final length will be original length plus...
by Sunday | Nov 14 | Physics JAMB
A. 2v/l B. v/5l C. v/4l D. v/2l Correct Answer: Option C = v/4l Explanation In vibration in a closed pipe/tube, as shown in the figure, fundamental note is produced at the first position of resonance. When the length of the air column L = λ/4; => λ = 4L. Since the...
by Sunday | Nov 14 | Physics JAMB
A. the temperature of both objects are equal B. the quantity of heat of both objects is the same C. the heat capacities of both objects are the same D. one object losses heat continuously to the other Correct Answer: Option A – the temperature of both objects...
by Sunday | Nov 14 | Physics JAMB
A. 15.0 B. 2.5 C. 1.5 D. 0.4 Correct Answer: Option B – 2.5 Explanation Form the lens formula = 1/U + 1/V = 1/f => 1/10 + 1/25 = 1/f; ∴ (5 + 2) / 50 = 1/f ∴ f = 50/7cm since the image is observed on a screen, it is a real image. Thus magnification M = f/U-f =...
by Sunday | Nov 14 | Physics JAMB
A. 0.95m B. 0.60m C. 0.50m D. 0.45m Correct Answer: Option D – 0.45m Explanation In vibration in a closed pipe/tube, the first resonance occurs at a position L = V/4f, when reading from the top of the tube, L1 = _340 4 x 340 = 0.25m L2 = 3V/4f L2 = 3 x 340 4 x...
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