An a.c circuit of e.m.f 12V has a resistor of resistance 8Ω connected in series to an inductor of inductive reactance 16Ω and a capacitor capacitive reactance 10Ω. The current flow in the circuit is?
A. 1.4A B. 1.2A C. 12.0A D. 14.0A Correct Answer: Option B – 1.2AA radioisotope has a decay constant of 10^−7s‾¹. The average life of the radioisotope is?
A. 1.00 x 107s B. 6.93 x 106s C. 1.00 x 10-7s D. 6.93 x 107s Correct Answer: Option B = 6.93 x 106s Explanation Average life / Half life (T½) = ln2/λ = 0.693/10-7 = 0.693 x 107 = 6.93 x 106
A generator manufacturing company was contracted to produce an a.c dynamo but inadvertently produced a d.c dynamo. To correct this error, the
A. armature coil should be made of silver B. commutator should be replaced with slip ring C. commutator should be replaced with split rings D. armature coil should be made of aluminium Correct Answer: Option B – commutator should be replaced with slip...
The binding energy of helium 4//2He is?
[atomic mass of proton = 1.00783U, atomic mass of neutron = 1.00867U] A. 4.033U B. 2.017U C. 0.033U D. 0.330U Correct Answer: Option C Explanation The binding energy of a nucleus is the work done or energy needed to separate completely the nucleons (protons and...Products
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