An object is weighted at different locations on the earth. What will be the right observation?
A. Both the mass and weight are constant B. Both the mass and weight vary C. the mass is constant while the weight varies D. the weight is constant while the mass varies Correct Answer: Option C – the mass is constant while the weight varies Explanation The...
In Faradays law of electrolysis; a graph of the mass deposited against the quantity of electricity is plotted. The slope of the graph gives?
A. the energy released B. the electrochemical equivalent C. the current flowing D. the charge released Correct Answer: Option B – the electrochemical equivalent Explanation In Faraday’s law of electrolysis M = It = Q Where M is the mass of substance...
Three 4Ω resistors connected in parallel have a potential difference of 16 V applied across them. What is the total current in the circuit?
A. 14 A B. 12 A C. 10 A D. 8 A Correct Answer: Option B = 12 A Explanation 1/R = 1/4 + 1/4 + 1/4 = 3/4 R = 4/3 I = V/R = 16/4/3 = (16 x 3)/4 = 12 A
A cell of e.m.f 12V and internal resistance 4Ω is connected to an external resistor of resistance 2Ω. Find the current flow.
A. 5 A B. 4 A C. 3 A D. 2 A Correct Answer: Option D = 2 A Explanation I = E/(R+r) = 12/6 = 2A
Three capacitors of capacitance 2μF; 4μFand 8μF are connected in parallel and a P.D of 6V is maintained across each capacitor. The total energy stored is?
A. 2.52 x 10-6J B. 6.90 x 10-6J C. 2.52 x 10-4J D. 6.90 x 10-4J Correct Answer: Option C – 2.52 x 10-4J Explanation C = C1 + C2 + C3 = 2 + 4 + 8 = 14μF V = 6V Energy = ½CV2 ½ x 14 x 10-6 x 62 = 2.52 x...Products
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