Electricity And Magnetism MCQ Practice Bits. We covered all the Electricity And Magnetism MCQ Practice Bits in this post.
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Electricity And Magnetism MCQ Practice Bits for Students
Magnetic flux
- dyne
- oersterd
- guass
- weber
Option 4 – weber
No force works on the conductor carrying electric current when kept ( Electricity And Magnetism MCQ )
- parallel to magnetic field
- perpendicular to magnetic field
- in the magnetic field
- away from magnetic field
Option 1 – parallel to magnetic field
A current carrying straight wire produces magnetic field around it. This was discovered by
- oersted
- faraday
- maxwell
- coulomb
Option 1 – oersted
The magnetic field lines inside a current carrying solenoid are ( Electricity And Magnetism MCQ )
- straight
- circular
- parabolic
- curved
Option 1 – straight
The scientist who invented electric generator, is:
- coulomb
- rutherford
- oersted
- Michael Faraday
Option 4 – Michael Faraday
An AC generator works on the principle of ( Electricity And Magnetism MCQ )
- heating effect of electric current
- magnetic effect of electric current
- electromagnetic induction
- sounding effect of electric current
Option 3 – electromagnetic induction
A device which produces electric current, is:
- generator
- ammeter
- galvanometer
- voltmeter
Option 1 – generator
A charge is moved from a point A to a point B. The work done to move unit charge during this process is called ( Electricity And Magnetism MCQ )
- potential at A
- potential at B
- potential difference between A and B
- current from A to B
Option 3 – potential difference between A and B
Joule/coloumb is the same as
- 1 – watt
- 1 – volt
- 1 – ampere
- 1 – ohm
Option 2 – 1 – volt
The current in the wire depends ( Electricity And Magnetism MCQ )
- only on the potential difference applied
- only on the resistance of the wire
- on both of them
- none of them
Option 3 – on both of them
Which of the following converts electrical energy into mechanical energy
- motor
- battery
- generator
- switch
Option 1 – motor
Which of the following converts mechanical energy into electrical energy ( Electricity And Magnetism MCQ )
- motor
- battery
- generator
- switch
Option 3 – generator
The magnetic force on a current carrying wire placed in uniform magnetic field if the wire is oriented perpendicular to magnetic field, is ……
- 1.0
- ILB
- 2ILB
- ILB/2
Option 2 – ILB
One Tesla = ( Electricity And Magnetism MCQ )
- newton/coloumb
- newton/ampere-meter
- ampere/meter
- newton/ampere second
Option 2 – newton/ampere-meter
When the short circuit condition occurs, the current in the circuit
(a) becomes zero.
(b) remains constant.
(c) increases substantially.
(d) keeps on changing randomly.
Option c – increases substantially
The connecting cable of electrical appliances like electric iron, water heater or room heater contains three insulated copper wires of three different colours- Red, Green and Black. Which one of the following is the correct colour code? ( Electricity And Magnetism MCQ )
(a) Red-live wire, Green-neutral wire and Black-ground wire.
(b) Red-neutral wire, Green-ground wire and Black-live wire.
(c) Red-live wire, Green-ground wire, and Black-neutral wire.
(d) Red-ground wire, Green-live wire and a Black neutral wire.
Option c – Red-live wire, Green-ground wire, and Black-neutral wire
What is the power rating (in W) of a bulb if a current of 0.3 A passes through an application of 240 V of potential difference across its terminals?
(a) 800
(b) 36
(c) 400
(d) 72
Option d – 72
A circuit has a fuse having a rating of 5A. What is the maximum number of 100 W-220 V bulbs that can be safely connected in parallel in the circuit? ( Electricity And Magnetism MCQ )
(a) 20
(b) 15
(c) 11
(d) 10
Option c – 11
What is the name of the device used to convert alternating current into direct current?
(a) Ammeter
(b) Galvanometer
(c) Rectifier
(d) Transformer
Option c – Rectifier
What precautions should be taken to avoid the overloading of domestic electric circuits? ( Electricity And Magnetism MCQ )
(a) The fuse should be connected to the circuit.
(b) Too many appliances should not be connected in a single circuit.
(c) Faulty appliances should not be connected to the circuit.
(d) All options are correct
Option d – All options are correct
The torque on a rectangular coil placed in a uniform magnetic field is large when the
(a) number of turns is large.
(b) a number of turns are less.
(c) plane of the coil is perpendicular to the magnetic field.
(d) area of the coil is small.
Option a – number of turns is large
Flemings’ “Left-hand Rule” is associated with the effect of ( Electricity And Magnetism MCQ )
(a) electric field on current.
(b) the magnetic field on the magnet.
(c) electric field on the magnet.
(d) the magnetic field on current.
Option d – the magnetic field on current
Which finger shows the direction of current in Fleming’s left-hand rule?
(a) Index finger
(b) Middle finger
(c) Thumb finger
(d) Ring finger
Option a – Index finger
Two long wires each carrying a current in the same direction are placed close to each other. Which one of the following statements is correct? ( Electricity And Magnetism MCQ )
(a) The wires will attract each other.
(b) The wires will repel each other.
(c) There will be no force between the wires.
(d) There will be a force between the wires only at the moment when the current is switched ON or OFF.
Option a – The wires will attract each other
Water is heated with a coil of resistance R connected to the domestic supply. The rise of the temperature of the water will depend on I. supply voltage. II. current passing through the coil. III. time for which voltage is supplied. Select the correct answer using the codes given below.
(a) I, II and III
(b) I and II
(c) Only I
(d) II and III
Option a – I, II and III
Kilowatt Hour (kWh) represents the unit of which of the following? ( Electricity And Magnetism MCQ )
(a) Electrical Power
(b) Force
(c) Momentum
(d) Energy
Option d – Energy
A current I flows through a resistor. A source maintains a potential difference of V across the resistor. The energy supplied by the source in time t is
(a) Vlt²
(b) Vl
(c) Vlt
(d) Vl/t
Option c – Vlt
A 100 W electric bulb is used for 10 h/day. How many units of energy are consumed in 30 days? ( Electricity And Magnetism MCQ )
(a) 1 unit
(b) 10 units
(c) 30 units
(d) 300 units
Option c – 30 units
The material used in the electric heater is
(a) Tungsten
(b) Nichrome
(c) Brass
(d) Steel
Option b – Nichrome
The coil wire in the electric room heater or electric cooking heater is called ……… ( Electricity And Magnetism MCQ )
(a) circuit
(b) element
(c) filament
(d) cells
Option b – element
A positively charged particle projected towards the West is deflected towards the North by a magnetic field. What is the direction of the magnetic field?
(a) Towards South
(b) Towards East
(c) Downward
(d) Upward
Option d – Upward
A common fluorescent tube contains ……..
(a) Argon vapour
(b) Mercury vapour
(c) Sodium vapour
(d) Neon vapour
Option b – Mercury vapour
The full form of CFL is
(a) Compact Fluorescent Lamp
(b) Centrally Fixed Lamp
(c) Chemical Fluorescent Lamp
(d) Condensed Fluorescent Lamp
Option a – Compact Fluorescent Lamp
What is the difference between a CLF and an LED lamp? I. To produce light, a CLF uses mercury vapour and phosphor while an LED lamp uses semiconductor material. II. The average life span of a CFL is much longer than that of an LED lamp. III. A CFL is less energy efficient as compared to an LED lamp. Which of the statement(s) given above is/are correct?
(a) Only I
(b) II and III
(c) I and III
(d) I, II and III
Option a – Only I
Assertion (A) Electric appliances with metallic bodies have three connections, whereas an electric bulb has a two-pin connection. Reason (R) Three-pin connections reduce the heating of connecting wires. Codes
(a) Both A and R are true and R is the correct explanation of A
(b) Both A and R are true, but R is not the correct explanation of A
(c) A is true, but R is false
(d) A is false, but R is true
Option c – A is true, but R is false
(a) the atomic number of a positive ion.
(b) the equivalent weight of electrolysis.
(c) the atomic number of negative ions.
(d) the velocity of the positive ion.
Option c – the atomic number of negative ions
What is the unit of measure of a magnetic field? ( MCQ on Current Electricity )
(a) Cobalt
(b) Ohm
(c) Tesla
(d) Ampere
Option c – Tesla
While moving from one end to another end inside a solenoid, its magnetic field ……….
(a) increases
(b) decreases
(c) remains same
(d) first increases then decrease
Option c – remains same
Which of the following property of a proton cannot change while it moves freely in a magnetic field?
(a) Speed
(b) Velocity
(c) Momentum
(d) Both speed and velocity
Option a – Speed
The cost of energy to operate an industrial refrigerator that consumes 5 kW power working 10 hours per day for 30 days will be (Given that the charge per kW.h of energy = ₹ 4)
(a) ₹ 600
(b) ₹ 6,000
(c) ₹ 1,200
(d) ₹1,500
Option d – ₹1,500
What is the net force experienced by a bar magnet placed in a uniform magnetic field?
(a) Zero
(b) Depends upon the length of the magnet
(c) Never zero
(d) Depends upon temperature
Option a – Zero
Which one of the following statements about magnetic field lines is NOT correct?
(a) They can emanate from a point
(b) They do not cross each other
(c) Field lines between two poles cannot be precisely straight lines at the ends
(d) There are no field lines within a bar magnet
Option d – There are no field lines within a bar magnet
A circuit has a fuse having a rating of 5 A. What is the maximum number of 100 W-220 V bulbs that can be safely connected in parallel in the circuit?
(a) 20
(b) 15
(c) 11
(d) 10
Option c – 11
A cooler of 1500 W, 200 volts, and a fan of 500 W, 200 volts are to be used from a household supply. The rating of the fuse to be used is
(a) 2.5 A
(b) 5.0 A
(c) 7.5 A
(d) 10 A
Option d – 10 A
A cylindrical conductor of length 1 and uniform area of cross-section A has resistance R. Another conductor of length 21 and resistance R of the same material has an area of cross-section
(a) A/2
(b) 3A/2
(c) 2A
(d) 3A
Option c – 2A
To convert an AC generator into a DC generator
(a) a split-ring type commutator must be used
(b) slip rings and brushes must be used
(c) a stronger magnetic field has to be used
(d) a rectangular wire loop has to be used
Option a – a split-ring type commutator must be used
If the current I through a resistor is increased by 100 % (assuming that temperature remains unchanged), the increase in power dissipated will be
(a) 100%
(b) 200%
(c) 300%
(d) 400%
Option c – 300%
An electric bulb is connected to a 220V generator. The current is 0.50 A. What is the power of the bulb?
(a) 440 W
(b) 110 W
(c) 55 W
(d) 0.0023 W
Option b – 110 W
For a current in a long straight solenoid, N-pole and S-pole are created at the two ends. Among the following statements, the incorrect statement is
(a) The field lines inside the solenoid are in the form of straight lines which indicates that the magnetic field is the same at all points inside the solenoid.
(b) The strong magnetic field produced inside the solenoid can be used to magnetize a piece of a magnetic material like soft iron when placed inside the coil.
(c) The pattern of the magnetic field associated with the solenoid is different from the pattern of the magnetic field around a bar magnet.
(d) The N-pole and S-pole exchange position when the direction of current through the solenoid is reversed.
Option c – The pattern of the magnetic field associated with the solenoid is different from the pattern of the magnetic field around a bar magnet
Commercial electric motors do not use
(a) an electromagnet to rotate the armature
(b) an effectively large number of turns of conducting wire in the current carrying coil
(c) a permanent magnet to rotate the armature
(d) a soft iron core on which the coil is wound
Option c – a permanent magnet to rotate the armature
The strength of the magnetic field inside a long current carrying a straight solenoid is
(a) more at the ends than at the center
(b) minimum in the middle
(c) same at all points
(d) found to increase from one end to the other
Option c – same at all points
In a solenoid, the current flowing through the wire is I, and the number of turns per unit length is n. This gives a magnetic field B inside the solenoid. If the number of turns per unit length is increased to 2n, what will be the value of a magnetic field in the solenoid?
(a) B
(b) 2B
(c) B/2
(d) B/4 regard
Option b – 2B
Which one of the following statements is correct with regard to the material of electrical insulators?
(a) They contain no electrons
(b) Electrons do not flow easily through them
(c) They are crystals
(d) They have more electrons than protons on their surface
Option b – Electrons do not flow easily through them
Choose the incorrect option.
(a) A bulb in electric circuits glows due to the heating effect of current.
(b) Tin cans, used for storing food are made by electroplating tin onto iron
(c) When the cells are connected in series, the resultant voltage is equal to the sum of the individual voltage of the cells
(d) None of these
Option d – None of these
What is the reason to pivot the compass needle on a sharp pin?
(a) To minimize the magnetic effect on the pin
(b) To maximize the magnetic effect on the pin
(c) To minimize the friction between the pin and the compass needle
(d) To ensure that the compass needle will not drop from the pivoted point
Option c – To minimize the friction between the pin and the compass needle
Consider the following statements: 1. The magnetic pole in the northern hemisphere is the north magnetic pole. 2. At all points on a magnet, an iron bar gets attracted. Which one of the following statements given above is/ are correct?
(a) 1 only
(b) 2 only
(c) Both 1 and 2
(d) Neither 1 nor 2
Option d – Neither 1 nor 2
Consider the following statements: Heat produced in a conductor carrying current is independent of 1. Current passing through it. 2. Thermal conductivity. 3. Specific resistance. Which of the statement given above is/are correct?
(a) 1 and 3
(b) 2 only
(c) 1 and 2
(d) 2 and 3
Option d – 2 and 3
Consider the following statements: 1. If a piece of a bar magnet is broken into two equally long pieces, the pieces will not lose the magnetic properties. 2. Magnetic properties of a substance lie at the atomic level. Which of the statements given above is/are correct?
(a) 1 only
(b) 2 only
(c) Both 1 and 2
(d) Neither 1 nor 2
Option c – Both 1 and 2
A given conductor carrying a current of 1 A produces an amount of heat equal to 2000 J. If the current through the conductor is doubled, the amount of heat produced will be
(a) 2000 J
(b) 4000 J
(c) 8000 J
(d) 1000 J
Option c – 8000 J
Two long wires each carrying a d.c. current in the same direction is placed close to each other. Which one of the following statements is correct?
(a) The wires will attract each other
(b) The wires will repel each other
(c) There will be no force between the wires
(d) There will be a force between the wires only at the moment when the current is switched ON or OFF
Option a – The wires will attract each other
Three equal resistances when combined in series are equivalent to 90 ohms. Their equivalent resistance when combined in parallel will be :
(a) 10 ohm
(b) 30 ohm
(c) 270 ohm
(d) 810 ohm
Option a – 10 ohm
Which one of the following devices changes low voltage alternating current to high voltage alternating current and vice versa?
(a) Generator
(b) Motor
(c) Transformer
(d) Vibrator
Option c – Transformer
Which one among the following is the correct order of power consumption for the light of equal intensity?
(a) CFL tube < Fluorescent tube < Incandescent bulb < Light emitting diode
(b) Light emitting diode <CFL tube < Fluorescent tube< Incandescent bulb
(c) CFL tube < Fluorescent tube < Light emitting diode < Incandescent bulb
(d) Incandescent bulb < Light emitting diode < Fluorescent tube < CFL tube
Option b – Light emitting diode
A coil of insulated copper wire is connected to a galvanometer forming a loop and a magnet is A: held stationary B: moved away along its axis C: moved towards along its axis There will be induced current in
(a) A only
(b) A and B only
(c) B and C only
(d) A, B, and C
Option c – B and C only
Which of the following statements is not true?
(a) The pattern of the magnetic field around a conductor due to an electric current flowing through it depends on the shape of the conductor
(b) The magnetic field of a solenoid carrying a current is similar to that of a bar magnet
(c) Magnitude of the magnetic field is directly proportional to the quantity of current flowing through the current
(d) Magnetic field produced by the passage of current through a straight wire is permanent
Option d – Magnetic field produced by the passage of current through a straight wire is permanent
A current passes through a wire of a non-uniform cross-section. Which of the following quantities are independent of the cross-section?
(a) The charge crossing in a given time interval
(b) Drift velocity
(c) Current density
(d) Free-electron density
Option a – The charge crossing in a given time interval
Which one of the following is correct? Lightning is formed, when
(a) similar charges of electricity rush towards each other and then get repelled
(b) clouds strike against impurities in the air and the friction burns up these impurities
(c) strong opposite charges in different clouds break down the resistance offered by intervening air
(d) water vapor produces electricity in the clouds
Option c – strong opposite charges in different clouds break down the resistance offered by intervening air
Which of the following items is used in the household wirings to prevent accidental fire in case of a short circuit?
(a) Insulated wire
(b) Plastic switches
(c) Non-metallic coatings on conducting wires
(d) Electric fuse
Option d – Electric fuse
When three resistors each having resistance, ‘r’ are connected in parallel, their resultant resistance is x. If these three resistances are connected in series, the total resistance will be
(a) 3x
(b) 3rx
(c) 9x
(d) 3/x
Option c – 9x
A simple circuit contains a 12 V battery and a bulb having 24-ohm resistance. When you turn on the switch, the ammeter connected to the circuit would read
(a) 0.5A
(b) 2A
(c) 4A
(d) 5A
Option a – 0.5A
Three resistors with magnitudes 2, 4, and 8 ohms are connected in parallel. The equivalent resistance of the system would be
(a) less than 2 ohms
(b) more than 2 ohms but less than 4 ohms
(c) 4 ohm
(d) 14 ohm
Option a – less than 2 ohms
Which one of the following statements about bar magnets is correct?
(a) The pole strength of the north pole of a bar magnet is larger than that of the south pole
(b) When a piece of a bar magnet is bisected perpendicular to its axis, the north, and south pole get separated
(c) When a piece of a bar magnet is bisected perpendicular to its axis two new magnets are formed
(d) The poles of a bar magnet are unequal in magnitude and opposite in nature
Option c – When a piece of a bar magnet is bisected perpendicular to its axis two new magnets are formed
Which one of the following common devices works on the basis of the principle of mutual induction?
(a) Tubelight
(b) Transformer
(c) Photodiode
(d) LED
Option b – Transformer
(a) Resistance
(b) Inductance
(c) Capacitance
(d) Wattage
Option a – Resistance
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