If a radioactive atom emits a beta particle, Its mass number.
A. increases by one B. remains the same C. decreases by one D. increases by two Correct Answer: Option B B. remains the sameCalculate the inductance L, of the coil in the circuit diagram shown below.
A. 3.8H B. 0.6H C. 0.4H D. 0.2H Correct Answer: Option B B. 0.6H Explanation XL = V/I=240/2=120Ω L = XL/2πf = 120×π/2×π×100 = 0.6HA freely-suspended magnet swinging in a horizontal plane comes to rest with its axis pointing approximately
A. north-south B. south-west C. north-east D. south-east Correct Answer: Option A A. north-southA transformer has 400 turns and 200 turns in the primary and secondary windings respectively. If the current in the primary and secondary windings are 3A and 5A respectively. calculate the efficiency of the transformer?
A. 85.0% B. 83.3% C. 37.5% D. 30.0% Correct Answer: Option B B. 83.3%Which of the following actions will not lead to an increase in the induced e.m.f. in a coil of wire rotating between the poles of a magnet? Increasing the…
A. strength of the magnet B. number of turns in the coil C. speed of location in the coil D. gap between the poles of the magnet Correct Answer: Option D D. gap between the poles of the magnetProducts
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