118.8cm² surface of the copper cathode of a voltameter is to be coated with 10^-6m thick copper of density 9 x 103kgm−³. How long will the process run with 10A constant current? [3.3 x 10^-7kgC‾¹]
A. 5.4 min B. 10.8 min C. 15.0 min D. 20.0 min Correct Answer: Option A – 5.4 min Explanation From faradays law, M = itz But mass, M = volume x density and volume = cross sectional area x thickness M = 118.8cm² x 10-6 x 9 x 10³ ∴ 118.8cm² x 10-6 x 9 x 10³ = 10 x...
The instantaneous value of the induced e.m.f as a function of time is ε = εo sin ωt where εo is the peak value of the e.m.f. The instantaneous value of the e.m.f. one quarter of the period is?
A. 0.00 B. εo/4 C. εo/2 D. εo Correct Answer: Option D = εo Explanation Period is the time to complete one cycle of 360o => Periodic Time T ≡ 1 cycle of 360o ∴ T/4 = 360/4 = 90o ∴ Instantaneous e.m.f E = Eo sin ωt = Eo sin 90 But sin 90 = 1: => E = Eo x 1 =...
The fundamental frequency of a plucked wire under a tension of 400N is 250Hz. When the frequency is changed to 500 Hz at constant length, the tension is
A. 1600N B. 400N C. 160N D. 40N Correct Answer: Option A = 1600N
A blacksmith heated a metal whose cubic expansivity is 6.3 x 10^-6K−¹. The areal expansivity is?
A. 2.0 x 10-6K-1 B. 2.1 x 10-6K-1 C. 4.2 x 10-6K-1 D. 6.3 x 10-6K-1 Correct Answer: Option C = 4.2 x 10-6K-1 Explanation If the lineal expansivity = ∝ => area expansivity β= 2∝. And cubic expansivity δ = 3∝. => 6.3 x 10-6 = 3∝ ∴ ∝ = ∴ ∝ = 6.3 x 10-6 = 2.1x 10-6...
A boy drags a bag of rice along a smooth horizontal floor with a force of 2N applied at the angle of 60° to the floor. The work done after a distance of 3m is?
A. 3 J B. 4 J C. 5 J D. 6 J Correct Answer: Option A – 3J Explanation Effective component of the force along the horizontal = F cos 60o Work done by this force : 60 F cos 60 x X = 2 x 0.5 x 3 =...Products
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