by Sunday | Nov 15 | Physics JAMB
A. A/√2 B. 2/√A C. 2 A D. √2 A Correct Answer: Option B = 2/√A Explanation If I = 2 Sin wt; but in a.c. circuit current I = I0 Sin wt; thus comparing the two equations, it implies that I0 = 2A; Again, the root means square (I(rms)) of an a.c. current is the value of...
by Sunday | Nov 15 | Physics JAMB
I. Low pressure. II. High pressure. III. High p.d. IV. Low p.d. A. I and IV only B. I and III only C. II and IV only D. II and III only Correct Answer: Option B – I and III only Explanation Electricity conduction through gases is usually done under low pressure...
by Sunday | Nov 15 | Physics JAMB
A. 2.0Ω B. 1.0Ω C. 2.5Ω D. 1.5Ω Correct Answer: Option A = 2.0Ω Explanation let the internal resistance of the cell = r, therefore E = I (R+r) (i) E = 0.4(4+r), (ii) E = 0.2 (10+r) therefore 0.4 (4+r)= 0.2 (10+r) 1.6 + 0.4r = 2.0 * 0.2r 0.4r – 0.2r = 2.0 –...
by Sunday | Nov 15 | Physics JAMB
A. e/4πԐoGm B. e2/Gm2 C. Gm2/4πԐoe2 D. e2/4πԐoeGm2 Correct Answer: Option D = e2/4πԐoeGm2 Explanation Electrostatic force = FE = e2/4λEod2 Gravitational force = FG = GM2/d2
by Sunday | Nov 15 | Physics JAMB
A. increase B. decrease C. decrease then increase D. remain constant Correct Answer: Option A – increase
by Sunday | Nov 15 | Physics JAMB
A. copper sulphate, copper and zinc B. manganese dioxide, carbon and zinc C. sulphuric acid, lead oxide and lead D. potassium hydroxide, nickel and iron. Correct Answer: Option A – copper sulphate, copper and zinc Explanation In the Daniel cell, i. Depolarize =...
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