If an object is placed between two parallel plane mirrors with their reflecting surfaces facing each other; how many images of the object will be formed?
A. Infinite B. Eight C. Four D. Two Correct Answer: Option A – Infinite Explanation The number of images to be observed will be infinite
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]
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...
An open pipe closed at one end produces its first fundamental note. If the velocity of sound in air is P and t the length of the pipe; the frequency of the note is?
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...
Thermal equilibrium between two object exist when?
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 what factor will the size of an object placed 10cm from a convex lens be increased if the image is seen on a screen placed 25cm from the lens?
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 =...Products
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