Refraction of lights differs from reflection in that, in refraction
i. at least two media are involved ii. there is a change in the direction of the ray iii. the speed of the ray changes. A. i only B. i and ii only C. ii and iii only D. i and iii only Correct Answer: Option B B. i and ii...A transverse wave can be distinguished from a longitudinal wave by?
A. diffraction B. reflection C. refraction D. polarization Correct Answer: Option D D. polarizationThe quality of a note depends on its?
A. frequency B. pitch C. overtones D. amplitude Correct Answer: Option C C. overtonesA car traveling at 30m‾¹ overcomes a frictional resistance of 100N while moving. Calculate the power developed by the engine. [1 hp = 0.75 kW]
A. 0.23hp B. 0.40hp C. 4.00hp D. 4.40hp Correct Answer: Option C C. 4.00hp Explanation P = FV = 100×30/1000 = 3kW 3/0.75 = 4hpA quantity of water at 20ºC is mixed with another quantity of water at 70ºC. The final steady temperature of the mixture is 40oC. Determine the ratio of the mass of the cold water to that of the hot water?
A. 7:2 B. 3:2 C. 2:5 D. 1:2 Correct Answer: Option B B. 3:2 Explanation Q = MCθ M = QCθ Q/20C : Q/30C = 3:2Products
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