1 A solenoid produces a magnetic field similar to that of a: A Bar magnet B Ring magnet C Horseshoe magnet D Circular magnet
2 The working principle of electric generator is: A Heating effect B Chemical effect C Electromagnetic induction D Electrostatic force
3 Which law gives magnitude of induced emf? A Ohm’s law B Faraday’s law C Lenz’s law D Kirchhoff’s law
4 Increasing the number of turns in a coil will: A Decrease induced emf B Have no effect C Increase induced emf D Stop induction
5 The main function of a transformer is to: A Store energy B Change AC voltage C Produce DC D Increase current only
7 The rule used to find direction of force on a conductor is: A Right hand thumb rule B Fleming’s left hand rule C Fleming’s right hand rule D Maxwell’s rule
8 The magnetic field around a straight current carrying conductor consists of: A Straight lines B Circular lines C Elliptical lines D Random lines
9 Electromagnetic induction occurs when: A Current flows steadily B Magnetic field is constant C Magnetic flux changes D Circuit is open
12 An electron beam can be deflected by: A Electric field only B Magnetic field only C Both electric and magnetic fields D Gravitational field
13 The force acting on a moving electron in a magnetic field is: A Electric force B Magnetic force C Gravitational force D Nuclear force
14 The magnetic field of Earth is similar to that of: A A straight wire B A solenoid C A bar magnet D An electric motor
16 The angle between geographic meridian and magnetic meridian is called: A Dip angle B Magnetic declination C Inclination D Deflection
17 Inside a long solenoid, the magnetic field is: A Zero B Weak and varying C Strong and uniform D Random
18 Which device uses the magnetic effect of current? A Electric heater B Electric bell C Electric bulb D Thermometer
20 The main principle of an electric motor is: A Electrostatics B Magnetic induction C Force on current carrying conductor D Heating effect of current