MCQ on Current Electricity. We covered all the MCQ on Current Electricity in this post for free so that you can practice well for the exam.
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Mock Test on Current Electricity for Students
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?
(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?
(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?
(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
(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?
(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?
(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?
(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 ………
(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
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