MCQ of Electricity Class 10. We covered all the MCQ of Electricity Class 10 in this post for free so that you can practice well for the exam.
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MCQ on Electricity for Class 10 Students
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
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