An electric current is a flow of:
(a) Electrons
(b) Protons
(c) Neutrons
(d) Positrons
Answer: (a) Electrons
The SI unit of electric current is the:
(a) Volt
(b) Ampere
(c) Ohm
(d) Coulomb
Answer: (b) Ampere
The force experienced by a charged particle moving in a magnetic field is called:
(a) Electric force
(b) Magnetic force
(c) Gravitational force
(d) Electromagnetic force
Answer: (b) Magnetic force
The direction of the magnetic field lines around a current-carrying wire can be determined using:
(a) Right-hand rule
(b) Left-hand rule
(c) Middle finger rule
(d) Index finger rule
Answer: (a) Right-hand rule
The strength of the magnetic field around a current-carrying wire depends on:
(a) Current in the wire
(b) Length of the wire
(c) Resistance of the wire
(d) Voltage across the wire
Answer: (a) Current in the wire
A wire carrying an electric current produces a magnetic field. This is known as:
(a) Ampere’s law
(b) Faraday’s law
(c) Lenz’s law
(d) Biot-Savart law
Answer: (d) Biot-Savart law
The magnetic field inside a solenoid is:
(a) Zero
(b) Uniform
(c) Stronger at the ends
(d) Weaker at the ends
Answer: (b) Uniform
The phenomenon of electromagnetic induction is associated with:
(a) Electric current
(b) Magnetic field
(c) Resistance
(d) Voltage
Answer: (d) Voltage
Faraday’s law of electromagnetic induction states that:
(a) The induced voltage is directly proportional to the current
(b) The induced voltage is inversely proportional to the resistance
(c) The induced voltage is directly proportional to the magnetic field strength
(d) The induced voltage is proportional to the rate of change of magnetic flux
Answer: (d) The induced voltage is proportional to the rate of change of magnetic flux
The phenomenon of self-induction occurs in a:
(a) Resistor
(b) Capacitor
(c) Transformer
(d) Inductor
Answer: (d) Inductor
In an AC circuit, the direction of current:
(a) Reverses periodically
(b) Remains constant
(c) Increases linearly
(d) Decreases linearly
Answer: (a) Reverses periodically
The unit of electrical power is the:
(a) Watt
(b) Volt
(c) Ampere
(d) Ohm
Answer: (a) Watt
The relationship between current, voltage, and resistance is given by:
(a) Ohm’s law
(b) Newton’s law
(c) Coulomb’s law
(d) Faraday’s law
Answer: (a) Ohm’s law
In a parallel circuit, the total resistance is:
(a) Equal to the sum of individual resistances
(b) Less than the smallest resistance
(c) Greater than the largest resistance
(d) Equal to the average of individual resistances
Answer: (b) Less than the smallest resistance
The energy stored in a capacitor is given by the equation:
(a) E = mc²
(b) E = ½mv²
(c) E = ½kx²
(d) E = ½CV²
Answer: (d) E = ½CV²
An electric motor converts:
(a) Electrical energy into mechanical energy
(b) Mechanical energy into electrical energy
(c) Heat energy into electrical energy
(d) Heat energy into mechanical energy
Answer: (a) Electrical energy into mechanical energy
A step-up transformer is used to:
(a) Increase voltage
(b) Increase current
(c) Decrease voltage
(d) Decrease current
Answer: (a) Increase voltage
The direction of an induced current in a coil can be determined by:
(a) Lenz’s law
(b) Faraday’s law
(c) Ohm’s law
(d) Ampere’s law
Answer: (a) Lenz’s law
The speed of light in a vacuum is approximately:
(a) 300 m/s
(b) 3,000 m/s
(c) 30,000 m/s
(d) 300,000,000 m/s
Answer: (d) 300,000,000 m/s
The electromagnetic spectrum includes:
(a) Radio waves, microwaves, and X-rays
(b) Radio waves, infrared, and ultraviolet
(c) Infrared, visible light, and X-rays
(d) Ultraviolet, X-rays, and gamma rays
Answer: (b) Radio waves, infrared, and ultraviolet
Which of the following materials is a good conductor of electricity?
(a) Wood
(b) Rubber
(c) Copper
(d) Glass
Answer: (c) Copper
The process of transferring charge by direct contact is called:
(a) Induction
(b) Conduction
(c) Insulation
(d) Polarization
Answer: (b) Conduction
A magnetic field is produced by:
(a) Stationary charges
(b) Moving charges
(c) Both stationary and moving charges
(d) Electric fields
Answer: (b) Moving charges
The force between two charged objects is strongest when:
(a) They have opposite charges
(b) They have the same charge
(c) They are far apart
(d) They are neutral
Answer: (a) They have opposite charges
The electric field lines around a positive charge:
(a) Radiate outwards
(b) Point inwards
(c) Are circular
(d) Are straight lines
Answer: (a) Radiate outwards
An object becomes negatively charged when:
(a) Electrons are added to it
(b) Electrons are removed from it
(c) Protons are added to it
(d) Protons are removed from it
Answer: (b) Electrons are removed from it
The process of charging a neutral object by bringing it close to a charged object is called:
(a) Conduction
(b) Induction
(c) Discharge
(d) Polarization
Answer: (b) Induction
An electric field exerts a force on a charged object in the direction:
(a) Opposite to the electric field
(b) Parallel to the electric field
(c) Perpendicular to the electric field
(d) Inward towards the source of the field
Answer: (b) Parallel to the electric field
Coulomb’s law describes the force between:
(a) Electric and magnetic fields
(b) Electric charges
(c) Magnetic poles
(d) Electromagnetic waves
Answer: (b) Electric charges
The relationship between electric current, voltage, and resistance is described by:
(a) Ampere’s law
(b) Ohm’s law
(c) Faraday’s law
(d) Coulomb’s law
Answer: (b) Ohm’s law
An electromagnetic wave consists of:
(a) Electric field only
(b) Magnetic field only
(c) Electric and magnetic fields oscillating perpendicular to each other
(d) Electric and magnetic fields oscillating in the same direction
Answer: (c) Electric and magnetic fields oscillating perpendicular to each other
The phenomenon of refraction is associated with:
(a) Light waves
(b) Sound waves
(c) Electromagnetic waves
(d) X-rays
Answer: (a) Light waves
The ability of a material to conduct electricity is measured by its:
(a) Conductance
(b) Resistance
(c) Capacitance
(d) Inductance
Answer: (a) Conductance
An insulator is a material that:
(a) Conducts electricity well
(b) Resists the flow of electric current
(c) Changes its resistance with temperature
(d) Stores electrical energy
Answer: (b) Resists the flow of electric current
The unit of electric charge is the:
(a) Volt
(b) Ampere
(c) Ohm
(d) Coulomb
Answer: (d) Coulomb
The force between two point charges is directly proportional to:
(a) The product of their charges
(b) The square of the distance between them
(c) The square root of the distance between them
(d) The cube of the distance between them
Answer: (a) The product of their charges
The process of storing electrical energy in a capacitor is called:
(a) Charging
(b) Discharging
(c) Polarizing
(d) Inducting
Answer: (a) Charging
An electric field is produced by a:
(a) Moving charge
(b) Stationary charge
(c) Magnet
(d) Conductor
Answer: (b) Stationary charge
The unit of electric potential difference is the:
(a) Volt
(b) Ampere
(c) Ohm
(d) Coulomb
Answer: (a) Volt
A device that converts mechanical energy into electrical energy is called a:
(a) Generator
(b) Motor
(c) Resistor
(d) Capacitor
Answer: (a) Generator
The property of a material that opposes the flow of electric current is called:
(a) Conductance
(b) Resistance
(c) Capacitance
(d) Inductance
Answer: (b) Resistance
The process of separating positive and negative charges in an object is called:
(a) Conduction
(b) Induction
(c) Discharge
(d) Polarization
Answer: (d) Polarization
The strength of the magnetic field around a current-carrying wire is increased by:
(a) Increasing the current
(b) Decreasing the current
(c) Increasing the resistance
(d) Decreasing the resistance
Answer: (a) Increasing the current
The unit of magnetic field strength is the:
(a) Tesla
(b) Ampere
(c) Ohm
(d) Coulomb
Answer: (a) Tesla
The direction of the magnetic field inside a solenoid can be determined using:
(a) Right-hand rule
(b) Left-hand rule
(c) Middle finger rule
(d) Index finger rule
Answer: (a) Right-hand rule
The process of generating an electric current by moving a magnet inside a coil of wire is called:
(a) Induction
(b) Conduction
(c) Resistance
(d) Capacitance
Answer: (a) Induction
The electromagnetic wave with the longest wavelength is:
(a) Radio waves
(b) Microwaves
(c) Infrared
(d) Ultraviolet
Answer: (a) Radio waves
The color of light with the highest frequency is:
(a) Red
(b) Green
(c) Blue
(d) Yellow
Answer: (c) Blue
The electromagnetic wave with the shortest wavelength is:
(a) Radio waves
(b) Microwaves
(c) Infrared
(d) Gamma rays
Answer: (d) Gamma rays
An electrically charged object will experience a force when placed in a:
(a) Magnetic field
(b) Electric field
(c) Gravitational field
(d) None of the above
Answer: (b) Electric field
The process of charging a neutral object by bringing it in contact with a charged object is called:
(a) Induction
(b) Conduction
(c) Discharge
(d) Polarization
Answer: (b) Conduction
The direction of the induced current in a coil can be determined by:
(a) Lenz’s law
(b) Faraday’s law
(c) Ohm’s law
(d) Ampere’s law
Answer: (a) Lenz’s law
The strength of the magnetic field inside an electromagnet can be increased by:
(a) Increasing the current
(b) Decreasing the current
(c) Increasing the number of turns in the coil
(d) Decreasing the number of turns in the coil
Answer: (c) Increasing the number of turns in the coil
The process of transferring charge from a charged object to the ground is called:
(a) Conduction
(b) Induction
(c) Discharge
(d) Polarization
Answer: (c) Discharge
The phenomenon of electromagnetic induction is associated with:
(a) Electric current
(b) Magnetic field
(c) Resistance
(d) Voltage
Answer: (d) Voltage
The energy stored in a capacitor is given by the equation:
(a) E = mc²
(b) E = ½mv²
(c) E = ½kx²
(d) E = ½CV²
Answer: (d) E = ½CV²
A step-down transformer is used to:
(a) Increase voltage
(b) Increase current
(c) Decrease voltage
(d) Decrease current
Answer: (c) Decrease voltage
The direction of an induced current in a coil can be determined by:
(a) Lenz’s law
(b) Faraday’s law
(c) Ohm’s law
(d) Ampere’s law
Answer: (a) Lenz’s law
The speed of light in a vacuum is approximately:
(a) 300 m/s
(b) 3,000 m/s
(c) 30,000 m/s
(d) 300,000,000 m/s
Answer: (d) 300,000,000 m/s
The electromagnetic spectrum includes:
(a) Radio waves, microwaves, and X-rays
(b) Radio waves, infrared, and ultraviolet
(c) Infrared, visible light, and X-rays
(d) Ultraviolet, X-rays, and gamma rays
Answer: (b) Radio waves, infrared, and ultraviolet
Which of the following materials is a good conductor of electricity?
(a) Wood
(b) Rubber
(c) Copper
(d) Glass
Answer: (c) Copper
The process of transferring charge by direct contact is called:
(a) Induction
(b) Conduction
(c) Insulation
(d) Polarization
Answer: (b) Conduction
A magnetic field is produced by:
(a) Stationary charges
(b) Moving charges
(c) Both stationary and moving charges
(d) Electric fields
Answer: (b) Moving charges
The force between two charged objects is strongest when:
(a) They have opposite charges
(b) They have the same charge
(c) They are far apart
(d) They are neutral
Answer: (a) They have opposite charges
The electric field lines around a positive charge:
(a) Radiate outwards
(b) Point inwards
(c) Are circular
(d) Are straight lines
Answer: (a) Radiate outwards
An object becomes negatively charged when:
(a) Electrons are added to it
(b) Electrons are removed from it
(c) Protons are added to it
(d) Protons are removed from it
Answer: (a) Electrons are added to it
The process of charging a neutral object by bringing it close to a charged object is called:
(a) Conduction
(b) Induction
(c) Discharge
(d) Polarization
Answer: (b) Induction
An electric field exerts a force on a charged object in the direction:
(a) Opposite to the electric field
(b) Parallel to the electric field
(c) Perpendicular to the electric field
(d) Inward towards the source of the field
Answer: (c) Perpendicular to the electric field
Coulomb’s law describes the force between:
(a) Electric and magnetic fields
(b) Electric charges
(c) Magnetic poles
(d) Electromagnetic waves
Answer: (b) Electric charges
The relationship between electric current, voltage, and resistance is described by:
(a) Ampere’s law
(b) Ohm’s law
(c) Faraday’s law
(d) Coulomb’s law
Answer: (b) Ohm’s law
