Electricity And Magnetism MCQ

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• Who among the following introduced the concept of electric field for the first time?
  ক

  Blaise Pascal

  খ

  Michael Faraday

  গ

  Charles Augustin de Coulomb

  ঘ

  Joseph Henry
• What is the net force experienced by a bar magnet placed in a uniform magnetic field?
  ক

  Zero

  খ

  Depends upon length of themagnet

  গ

  Never zero

  ঘ

  Depends upon temperature
• Which of the following is a conductor of electricity?
  ক

  Rubber

  খ

  Pure water

  গ

  Salt water

  ঘ

  Benzene
• Electricity is produced through dry cell from
  ক

  chemical energy

  খ

  thermal energy

  গ

  mechanical energy

  ঘ

  nuclear energy
• Which of the following devices is based on the phenomenon of electromagnetic induction?
  ক

  Galvanometer

  খ

  Bulb

  গ

  Ammeter

  ঘ

  Generator
• A fuse is a
  ক

  safety device and regulates flow of current

  খ

  made up of tin and lead alloy

  গ

  has low melting point

  ঘ

  All of the above
• Which law of physics states that the force between the two electric charges reduces to a quarter of its former value when the distance between them is doubled?
  ক

  Coulomb's Law

  খ

  Pascal's Law

  গ

  Stefan's Law

  ঘ

  Hooke's Law
• When the short circuit condition occurs, the current in the circuit
  ক

  becomes zero

  খ

  remains constant

  গ

  increases substantially

  ঘ

  keeps on changing randomly
• A device which converts chemical energy into electrical energy is called
  ক

  Battery

  খ

  Motor

  গ

  Generator

  ঘ

  Moving coil meter
• What is the SI unit of electrical resistance?
  ক

  Volt

  খ

  Ohm

  গ

  Mole

  ঘ

  Ampere
• Which of the following is an example of the conversion of electrical energy into mechanical energy?
  ক

  electric fan

  খ

  flashlight

  গ

  iron

  ঘ

  television
• Which one of the following statements about bar magnet is correct?
  ক

  The pole strength of the North pole of a bar magnet is larger than that of the South pole

  খ

  When a piece of bar magnet is bisected perpendicular to its axis, the North and South poles get separated

  গ

  When a piece of bar magnet is bisected perpendicular to its axis, two new bar magnets are formed

  ঘ

  The poles of a bar magnet are unequal in magnitude and opposite in nature
• Which of the following is measured in the unit called Gauss?
  ক

  Radius of the nuclei

  খ

  Magnetic induction

  গ

  Marine depth

  ঘ

  Force
• Which of the following is a good conductor of heat but a bad conductor of electricity?
  ক

  Celluloid

  খ

  Rubber

  গ

  Asbestos

  ঘ

  Mica
• What precaution should be taken to avoid the overloading of domestic electric circuits?
  ক

  Fuse should be connected in the circuit

  খ

  Too many appliances should not be connected in single circuit

  গ

  Faulty appliances should not be connected in the circuit

  ঘ

  All options are correct
• In electrical motor
  ক

  heat is converted into electrical energy

  খ

  electrical energy is converted into heat

  গ

  electrical energy is converted into mechanical energy

  ঘ

  mechanical energy is converted into electrical energy
• Which among the following is not a conductor of electricity?
  ক

  Mercury

  খ

  Manganese

  গ

  Iron

  ঘ

  Ebonite
• Which of the following is not an insulator?
  ক

  Paper

  খ

  Nichrome

  গ

  Diamond

  ঘ

  Ebonite
• What is the process of transferring of charge from a charged object to the Earth called?
  ক

  Discharging

  খ

  Earthing

  গ

  Interaction

  ঘ

  Lightning
• A device which converts electrical energy into mechanical energy is
  ক

  Dynamo

  খ

  Transformer

  গ

  Electric motor

  ঘ

  Inductor
• Which of the following forces is not electromagnetic in nature?
  ক

  Weight of body

  খ

  Tension in rope

  গ

  Frictional force

  ঘ

  Electric force in spring
• Which one of the following statements regarding Ohm's law is not correct?
  ক

  Ohm's law is an assumption that current through a conductor is always directly proportional to the potential difference applied to it

  খ

  A conducting device obeys Ohm's law when the resistance of a device is independent of magnitude and polarity of applied potential difference

  গ

  A conducting material obeys Ohm's law when the resistance of material is independent of the magnitude and direction of applied electric field

  ঘ

  All homogeneous materials obey Ohm's law irrespective of whether the field is within range or strong
• Flemings "Left hand Rule" is associated with the effect of
  ক

  electric field on current

  খ

  magnetic field on magnet

  গ

  electric field on magnet

  ঘ

  magnetic field on current
• Which of following property of a proton cannot change while it moves freely in magnetic field?
  ক

  Speed

  খ

  Velocity

  গ

  Momentum

  ঘ

  Both speed and velocity
• A mobile phone charger is
  ক

  an inverter

  খ

  a ups

  গ

  a step up transformer

  ঘ

  a step down transformer