JEE & NEETJEE Physics JEE Main Physics 100+ MCQ & Answer | Page-01 | JEE & NEET MCQ February 4, 2025 DSN MARATHI 01. The metal detectors installed at airports and other places for security purpose are based on the principle of ________. A. potential difference B. electromagnetic difference C. electromagnetic induction D. potential energy Answer Option : C 02. Name two main parts of an AC generator. A. stator B. rotor C. None of these D. Both 1 and 2 Answer Option : D 03. If the coil is placed perpendicular to field lines then the number of lines passing through the coil is ________. A. Minimum B. Maximum C. Zero D. maybe maximum or minimum Answer Option : B 04. AC generator converts ________. A. Mechanical energy to electrical energy B. Electrical energy to mechanical energy C. Heat energy to mechanical energy D. None of the above Answer Option : A 05. In A.C generator increasing the no. of turns in the coil ________. A. Decrease the Electromotive force (EMF) B. Electromotive force(EMF) remains the same C. Increases the Electromotive force (EMF) D. Electromotive force (EMF) becomes zero Answer Option : C 06. What replacement is required to convert an AC generator to DC generator ? A. Concave magnets with horseshoe magnets B. Armature with coil C. Slip rings with split rings D. None of the above Answer Option : C 07. The Electromotive force (EMF) developed by the generator depends upon ________. A. Area of rotating wire B. Length of rotating wire C. Radius of wire D. size of magnet Answer Option : B 08. An alternator is an electromechanical ac generator. A. True B. False Answer Option : B 09. The direction of induced EMF or current is indicated by ________. A. Fleming’s left-hand rule B. Fleming’s right-hand rule C. Faraday’s law of electromagnetic induction D. None of these Answer Option : B 10. In alternative current generator, AC current reverse its direction ________. A. 10 times per second B. 20 times per second C. 60 times per second D. 50 times per second Answer Option : D
01. The metal detectors installed at airports and other places for security purpose are based on the principle of ________. A. potential difference B. electromagnetic difference C. electromagnetic induction D. potential energy Answer Option : C
02. Name two main parts of an AC generator. A. stator B. rotor C. None of these D. Both 1 and 2 Answer Option : D
03. If the coil is placed perpendicular to field lines then the number of lines passing through the coil is ________. A. Minimum B. Maximum C. Zero D. maybe maximum or minimum Answer Option : B
04. AC generator converts ________. A. Mechanical energy to electrical energy B. Electrical energy to mechanical energy C. Heat energy to mechanical energy D. None of the above Answer Option : A
05. In A.C generator increasing the no. of turns in the coil ________. A. Decrease the Electromotive force (EMF) B. Electromotive force(EMF) remains the same C. Increases the Electromotive force (EMF) D. Electromotive force (EMF) becomes zero Answer Option : C
06. What replacement is required to convert an AC generator to DC generator ? A. Concave magnets with horseshoe magnets B. Armature with coil C. Slip rings with split rings D. None of the above Answer Option : C
07. The Electromotive force (EMF) developed by the generator depends upon ________. A. Area of rotating wire B. Length of rotating wire C. Radius of wire D. size of magnet Answer Option : B
09. The direction of induced EMF or current is indicated by ________. A. Fleming’s left-hand rule B. Fleming’s right-hand rule C. Faraday’s law of electromagnetic induction D. None of these Answer Option : B
10. In alternative current generator, AC current reverse its direction ________. A. 10 times per second B. 20 times per second C. 60 times per second D. 50 times per second Answer Option : D
