Updated by Tiwari Academy
on April 27, 2023, 6:43 AM
on April 27, 2023, 6:43 AM
Class 10 Science Chapter 12 MCQ (Multiple Choice Questions) of Magnetic Effects of Electric Current. All MCQs are important for exams as well as school tests. Practice with these objective questions to score more in your terminal exams or unit tests. These MCQs includes almost all questions from intext questions and exercises questions. Answers and explanation of each MCQ is given along with the questions.
Class 10 Science Chapter 12 MCQ Online Test
| Class: 10 | Science |
| Chapter: 12 | Magnetic Effects of Electric Current |
| Contents: | MCQ Online Tests with Answers |
| Session: | CBSE 2024-25 |
Class 10 Science Chapter 12 MCQ with Answers for 2024-25
Class 10 Science Chapter 12 MCQ Online Test with answers are given here to provide a perfect practice to the all students of grade 10. All the answers are taken from NCERT Books for class 10 science only. There are about 75 questions divided in sets of questions. If a user need more practice, click on the button “Start a New Test” given at the end of last question.
Q1
The magnetic field lines produced by a bar magnet:
[A]. Originate from the south pole and end at its north pole
[B]. Originate from the north pole and end at its east pole
[C]. Originate from the north pole and end at its south pole
[D]. Originate from the south pole and end at its west pole
Q2
The magnetic field lines:
[A]. Intersect at right angles to one another
[B]. Interest at an angle 45° to each another
[C]. Do not cross one another
[D]. Cross at an angle of 60° to one another
Q3
A D.C. generator is based on the principle of:
[A]. Electrochemical induction
[B]. Electromagnetic induction
[C]. Magnetic effect of current
[D]. Heating effect of current
Q4
Commercial electric motors do not use
[A]. An electromagnet to rotate the armature
[B]. 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
Q5
A plotting compass is placed near the south pole of a bar magnet. The pointer of plotting compass will:
[A]. Point away from the south pole
[B]. Point parallel to the south pole
[C]. Point towards the south pole
[D]. Point at right angles to the south pole
Q6
Which of the following statements is incorrect regarding magnetic field lines?
[A]. The direction of magnetic field at a point is taken to be the direction in which the north pole a magnetic compass needle points.
[B]. Magnetic field lines are closed curves.
[C]. If magnetic field lines are parallel and equidistant, they represent zero field strength.
[D]. Relative strength of magnetic field is shown by the degree of closeness of the field lines.
Q7
Consider the following statements and choose the correct one:
[A]. A magnet is an object which attracts piece of iron steel Nickel and Cobalt.
[B]. Magnetic effect of electric current means that an electric current flowing in a wire produces a magnetic field around it.
[C]. The end of a a freely suspended magnet which points towards the north direction is called the north pole of the magnet
[D]. All the above
Q8
[A]. The production of electricity from magnetism is called electromagnetic induction.
[B]. The process of electromagnetic induction has led to the construction of a generator for producing electricity at power stations.
[C]. An ammeter is an instrument which can detect the presence of electric current in a circuit.
[D]. None of the above.
Q9
Consider the following statements and choose the incorrect one:
[A]. Iron feelings show the shape of magnetic field produced by a bar magnet by aligning themselves with the magnetic field lines.
[B]. A compass consists of a tiny pivoted magnet usually in the form of a pointer which can turn freely in the horizontal plane.
[C]. A compass needle do not deflected when brought near a bar magnet.
[D]. The strength of magnet field is indicated by the degree of closeness of the field lines.
Q10
The phenomenon of electromagnetic induction is:
[A]. The process of charging a body.
[B]. The process of generating magnetic field due to a current passing through a coil.
[C]. Producing induced current in a coil due to relative motion between a magnet and the coil.
[D]. The process of rotating a coil of an electric motor.
Q11
The essential difference between an AC generator and a DC generator is that:
[A]. A.C. generator has an electromagnet while a DC generator has permanent magnet.
[B]. D.C. generator will generate a higher voltage.
[C]. A.C. generator will generate a higher voltage.
[D]. A.C. generator has slip rings while the DC generator has a commutator.
Q12
Each one of the following changes will increase emf (or voltage) in a simple generator except:
[A]. Increasing the number of turns in the armature coil
[B]. Winding the coil on a soft iron armature
[C]. Increasing the size of the gap in which the armature turns
[D]. Increasing the speed of rotation
Q13
Read the following sentences carefully, and choose the correct one:
[A]. If the direction of current in the front face of a circular wire is clockwise then the direction of current in the back face of the circular wire will be anticlockwise.
[B]. The solenoid is a long coil containing a large number of close turns of insulated copper wire.
[C]. The magnetic field produced by a current carrying solenoid is similar to the magnetic field produced by a bar magnet.
[D]. All the above.
Q14
The north pole of a long bar magnet was pushed slowly into a short solenoid connected to a galvanometer. The magnet was held stationary for a few seconds with the north pole in the middle of the solenoid and then withdrawn rapidly. The maximum deflection of the galvanometer was observed when the magnet was:
[A]. Moving towards the solenoid
[B]. Moving into solenoid
[C]. At rest inside the solenoid
[D]. Moving out of the solenoid
Q15
An electric generator converts:
[A]. Electrical energy into mechanical energy.
[B]. Mechanical energy into heat energy.
[C]. Electrical energy into chemical energy.
[D]. Mechanical energy into electrical energy.
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Q16
An induced current is produced when a magnet is moved into a coil. The magnitude of induced current does not depend on:
[A]. The speed with which the magnet is moved
[B]. The number of turns of the coil
[C]. The resistivity of the wire of the coil
[D]. The strength of the magnet
Q17
Daksh is doing his homework which is given by his teacher. Would you help him to choose the correct sentences?
[A]. Extremely weak electric currents are produced in the human body by the movement of charged particles called ions.
[B]. The two main organs of the human body where the magnetic field produced is quite significant are the heart and the brain.
[C]. The magnetism produced inside the human body from the basis of the technique called Magnetic Resonance Imaging.
[D]. All the above.
Q18
Which one of the following statements is not true?
[A]. In a house circuit, lamps are used in parallel.
[B]. Switches, fuses and circuit breakers should be placed in the neutral wire
[C]. An electric iron has its earth wire connected to the metal case to prevent the user receiving a shock
[D]. When connecting a three-core cable to a 13 A three-pin plug, the red wire goes to the live pin.
Q19
In the last year board examination, Rahul were asked a question where he had to choose the statement which was/were correct? Will you be able to answer this question?
[A]. A magnet exerts a mechanical force on a current carrying wire, and if the wire is free to move, this force can produce a motion in the wire.
[B]. When current carrying conductor is placed in a magnetic field, a mechanical force is exerted on the conductor which can make the conductor move.
[C]. The direction of force acting on a current carrying wire placed in a magnetic field is perpendicular to the direction of current.
[D]. All the above.
Q20
Recently, in a science class test, you are asked a question where you have to say whether the statements are correct or not?
[A]. The minimum force is exerted on a current carrying conductor only when it is perpendicular to the direction of magnetic field.
[B]. The direction of force on a current carrying conductor placed in a magnetic field can also be reversed by reversing the direction of magnetic field.
[C]. No force acts on a current carrying conductor when it is parallel to the magnetic field.
[D]. None of the above
Q21
Which of the following statement is or are correct?
[A]. A motor is a device which converts electrical energy to mechanical energy.
[B]
[C]
[D]
[B]. A motor works on the principle that when a rectangular coil is placed in a magnetic field and current is passed through it a force exerted on the coil which rotates it continuously.
[C]. Commutator rings reverse the direction of current flowing through the coil after every half rotation of the coil.
[D]. All the above.
Q22
Read the following sentences carefully, and choose the correct one:
[A]. The direction of induced current can also be reversed by reversing the direction of magnetic field.
[B]. A generator uses the movement or rotation of a rectangular coil of wire between the poles of a horseshoe magnet to produce an electric current.
[C]. If a wire (in the form of a coil) is kept fixed, but a magnet is moved inside it, even then a current is produced in the coil of wire.
[D]. All the above.
Q23
Recently, in a science class test, you are asked a question where you have to say whether the statements are correct or not?
[A]. If we replace the slip rings on an AC generator by a commutator, then it will become a DC generator.
[B]. The only difference between a DC generator and AC generator is in the way the two ends of the generator coil are linked to the outer circuit.
[C]. The power house AC generators have a fixed set of coils arranged around a rotating electromagnet.
[D]. None of the above.
Q24
Read the following sentences carefully, and choose the incorrect one:
[A]. All the electrical appliances like bulbs, fans and sockets etc. are connected in parallel across the live wire and the neutral wire.
[B]. There are two separate circuits in a house, the lightning circuit with a 15 A fuse and the power circuit with a 25 A fuse.
[C]. The main advantage of the parallel connection is that if one of the appliances is switched off, or gets fused, there is no effect on the other appliances and they keep on operating.
[D]. Another advantage of the parallel circuits is that the same voltage of the mains line is available for all the electrical appliances
Q25
Priya is writing some statements, choose the incorrect statement and help him:
[A]. To avoid the risk of electric shocks, the metal body of an electrical appliance is “earthed”.
[B]. Touching of the live wire and neutral wire directly is known as short circuit.
[C]. The red colored wire is the live wire, and the black wire is the earth wire, whereas green wire is the neutral wire.
[D]. An extremely large current can flow in domestic wiring under two circumstances i.e., short circuiting and overloading.
It was first shown by Oersted that electricity and magnetism were related phenomena.
What is magnetic field according to Class 10 Science chapter 12?
The region surrounding a magnet, in which the force of the magnet can be detected, is called magnetic field of the magnet.
Why do two magnetic field line not intersect explain as in 10th Science NCERT?
No two field-lines are found to cross each other. If they did, it would mean that at the point of intersection, the compass needle would point towards two directions, which is not possible.
State the Fleming’s left-hand rule according to 10th Science Chapter 12?
According to this rule, stretch the thumb, forefinger and middle finger of your left hand such that they are mutually perpendicular. If the first finger points in the direction of magnetic field and the second finger in the direction of current, then the thumb will point in the direction of motion or the force acting on the conductor.
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Last Edited: April 27, 2023
