Physics - Study Mode
[#571] A device which is used to limit the current in an electrical circuit is called a
Correct Answer
(B) Fuse
Explanation
Solution: A fuse places a limit on the amount of current that can be drawn by an electric circuit by opening (blowing or melting) when the current exceeds a preset limit. This protects the circuit and the surroundings from fire or damage in the case of an overload or short circuit.
[#572] Materials that allow electricity to flow are called
Correct Answer
(B) Conductors
Explanation
Solution: Materials that allow electricity to flow are called conductors.
[#573] The fundamental scientific principle in the operation of battery is
Correct Answer
(C) Dissociation of electrolytes
Explanation
Solution: The electrolyte consists of a solvent (water, an organic liquid, or even a solid) and one or more chemicals that dissociate into ions in the solvent. These ions serve to deliver electrons and chemical matter through the cell interior to balance the flow of electric current outside the cell during cell operation. An electrolyte is a liquid or gel that contains ions and can be decomposed by electrolysis, e.g., that present in a battery. Commonly, electrolytes are solutions of acids, bases, or salts. Electrolyte solutions can also result from the dissolution of some biological (e.g., DNA, polypeptides) and synthetic polymers (e.g., polystyrene sulfonate), termed poly-electrolytes, which contain charged functional groups.
[#574] If the current flowing through a circuit is 0.6 A for 6 mins, the amount of electric charge flowing through it is ________
Correct Answer
(B) 216 C
[#575] In a magnetic field, the direction of motion of a current carrying conductor is given by
Correct Answer
(C) Flemings left hand rule
Explanation
Solution: In a magnetic field, the direction of motion of a current carrying conductor is given by Flemings left hand rule.