The silvered surface in a vacuum flask reduces heat loos due to?
A. conduction B. convection C. radiation D. evaporation Correct Answer: Option C C. radiationThe sagging of overhead electrical cables is the consequence of?
A. linear expansivity B. superficial expansivity C. cubic expansivity D. conductivity Correct Answer: Option A A. linear expansivityA block and tackle system has six pulleys. a force of 50N applied to it lifts a load of weight W. If the efficiency of the system is 40%, calculate W.
A. 300N B. 200N C. 140N D. 120N Correct Answer: Option D D. 120NThe velocity ratio of an inclined plane, inclines at an angle θ to the horizontal can be expressed as?
A. (sin θ)‾¹ B. sinθ C. (cos θ)‾¹ D. cosθ Correct Answer: Option A A. (sin θ)‾¹The engine of a train produces a force of 3000N when moving at 30.ms‾¹. calculate the power of the engine
A. 1.00 x 10²W B. 3.00 x 10^4W C. 9.00 x 10^4W D. 3.00 x 10^5W Correct Answer: Option C C. 9.00 x 10^4W Explanation P = FV = 3 x 10³ x 30 = 9 x 10^4WProducts
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