### Chapter 20 - Electromagnetism - 2

 1. Transformer works on the principle of self inductiona) Trueb) False
 2. Transformer is used as an important part of most ofthe electronic devices.a) Trueb) False
 3. There is only one coil in a transformer.a) Trueb) False
 4. A bar magnet has north and south poles.a) Trueb) False
 5. If we grasp the current carrying conductorin our right hand with the stretched thum, then tumb shows the direction ofa) Magnetic field b) Electric fieldc) Electric currentd) Magnetic flux
 6. The shape of magnetic lines force in case of a straight current carrying conductor isa) Elliptical b) Triangularc) Rectangulard) Circular
 7. When a straight current carrying conductor is placed in a magnetic field at right angles to it the direction of force acting upon it isa) Same as the direction of field b) Opposite to the direction of fieldc) Makes and angle of 45 degree with the currentd) At right angles to both the field and the current
 8. In an electric curcuit a switch key is used fora) Switch on flow of current b) Swith off to flow of currentc) Both for on and off currentd) None of the above
 9. When a current carrying conductor is placed at an angle theta with a magnetic field then force is directly propotional toa) Cos theta b) Tan thetac) Sin thetad) All of the above
 10. If the conductor is placed parallel to the field, force act upon the conductor is a) Maximum b) Minimum c) Zero d) Constant
 11. In D.C. motor spindle of the coil is fixed with the ring made up ofa) Iron b) Steelc) Silverd) Copper
 12. In mutual induction current induced in one circuit is due to change of current in another ina) Another circuit b) Same circuitc) Both circuitsd) None of the above
 13. The coil in which the change in the current produces induced current in another coil known asa) First coil b) Primary coilc) Secondary coild) Second coil
 14. When current passes through a coil, it produces a magnetic field, which one of the following pass through turns of the coila) High voltage b) Magnetic fluxc) Lines of forced) Steady current
 15. According to the right hand rule, if the current flows from bottom end to top then the direction of the lines of force area) Clock wise b) Anti clockwisec) Both clock wise and anti clockwised) None of the above
 16. A closely wound cylindrical coil of insulated wire is calleda) DC motor b) AC Generatorc) Transformerd) Solenoid
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