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Free Online Mock Physics Multiple Choice Test on AC transformers
Sub Category : AC transformers Test : 5 Time Left :
1)Lenzs law is consequence of the law of conservation of
(1) Charge (2) Mass (3) Energy (4) Momentum
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2) An electron moves along the line AB, which lies in the same plane as a circular loop of conducting wire as shown in the figure. What will be the direction of current induced, if any, in the loop(1) No current will be induced (2) The current will be clockwise (3) The current will change direction as the electron passes by (4) The current will be anticlockwise
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3) A copper rod of length l is rotated bout one end perpendicular to the magnetic field B with constant angular velocity ω. The induced e.m.f. between the two ends is(1) B ωlpower2 (2) 2Blpower2 ω (3) 1/2 B ωlpower2 (4) 3/4 Blpower2 ω
1 2 3 4
4) The back e.m.f induced in a coil when current changes from 1 A to zero in one millisecond is 4 volt.The self inductance of the coil is(1) 1 H (2) 4 H (3) 4 x 10power-3 H (4) 10power-3 H
1 2 3 4
5)An e.m.f. of 5V is produced by a self inductance when the current changes at a steady rate from 3 to 2 amp in 1 millisecond. The value of self inductance is
(1) Zero (2) 5H (3) 5 mH (4) 5,000 H
1 2 3 4
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