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Physics Past Questions


Question 651:


Which of the following obeys Ohm's Law?

A. Glass
B. Diode
C. All electrolytes
D. All metals


Question 652:


An equipment whose power is 1500W and resistance is 375 ohms would draw a current of

A. 0.10A
B. 2.00A
C. 4.00A
D. 77.5A


Question 653:


To convert an alternating current dynamo into a direct current dynamo, the

A. Number of turns in the coil is increased
B. Strength of the field magnet is increased
C. Slip rings are replaced with a split ring commutator
D. Coil is wound on a soft iron armature


Question 654:


If a current carrying coil is mounted on a metal frame, the back e.m.f. induced in the coil causes

A. Inductance
B. Eddy currents
C. Elecro-magnetism
D. Dipole moment


Question 655:


The electrochemical equivalent of platinum is 5.0 x 10-7kgC-1 to plate-out 1.0kg of platinum, a current of 100A must be passed through an appropriate vessel for

A. 5.6 hours
B. 56 hours
C. 1.4 x 104 hours
D. 2.0 x 104 hours






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