Magnetic lines of force are, directed from the north pole to south pole in the magnetic field., directed from the south pole to north pole inside a magnet., Closed loop, all of these, In which of the following devices temporary magnets are used?, Dynamo, electric motor, Generators, electric cranes, Which of the following properties of a magnet is/are used in navigation?, Directive property, Attractive property, Pair property, None of these, Which of the following is not a magnetic substance?, Iron, Cobalt, copper, Nickel, The attracting power of a magnet is, maximum at its centre., maximum at its poles., minimum at its poles., Evenly distributed, In the single touch method of magnetization, the north pole of a bar magnet is rubbed against a steel rod. The polarity of the end of the steel rod at which the magnet leaves, is the south., is the north, depends upon the material., None of these, In the electrical method of magnetization, the polarity of the end in which current flows in clockwise direction, is the north pole., is the south pole, does not depend upon the direction of current flow., can not be determined, An electric bell works on the principle of _______., magnetic induction, Attractive property, Electromagnetism, All of the above, The angle of declination is ________., 0° at equator, 90° at poles, Variable, none of the above, Which of the following substances is repelled by strong magnet?, Iron, Gold, Aluminium, Platinum, A transformer contains 100 and 150 turns in its primary and secondary coils, respectively. The transformer is a (A) Step up transformer (B) Step down transformer, Only A is true, Only B is true, Both A and B is true, Both A and B is false, In an electric generator, the voltage induced across the terminals of the copper coil when it rotates in the magnetic field is _______., An alternating voltage, Direct voltage, step up voltage, step down voltage, A current passes from south to north, through a conductor placed in a horizontal position. If a magnetic needle is placed horizontally below the conductor, then it would deflect towards, West, East, North, south, Magnetic field lines inside a solenoid, Divergent, Convergent, Parallel to each other, None of these, If a bar of steel is placed in a solenoid, then it changes to _________., an electric bell, an electromagnet, a dynamo, a permanent magnet, The strength of magnetic field due to a straight current carrying conductor, at a given distance increases with increase in the, Temperature of the conductor, length of the conductor, Strength of electric current, both a and c, The magnetic lines of force around a current carrying straight conductor are in the form of, parallel, concentric circles, Concentric sphere, Coaxial cylinder, A coil is moved towards a stationary magnet. The voltage induced in the coil depends on _____, Area of the coil, Number of turns of the coil, the speed with which the coil is moved towards the bar magnet., All of the above

Magnetism

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