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 most important safety method used for protecting home appliances from short circuiting or overloading is
[A]. Earthing
[B]. Use of fuse
[C]. Use of stabilizers
[D]. Use of electric meter
Q2
To convert an AC generator into DC generator
[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
Q3
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
Q4
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
Q5
Choose the incorrect statement
[A]. Fleming’s right-hand rule is a simple rule to know the direction of induced current
[B]. The right-hand thumb rule is used to find the direction of magnetic fields due to current carrying conductors
[C]. The difference between the direct and alternating currents is that the direct current always flows in one direction, whereas the alternating current reverses its direction periodically
[D]. In India, the AC changes direction after every 1/50 second
Q6
For a current in a long straight solenoid N- and S-poles 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 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- and S-poles exchange position when the direction of current through the solenoid is reversed
Q7
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.
Q8
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
Q9
Which of the following correctly describes the magnetic field near a long straight wire?
[A]. The field consists of straight lines perpendicular to the wire.
[B]. The field consists of straight lines parallel to the wire.
[C]. The field consists of radial lines originating from the wire.
[D]. The field consists of concentric circles centred on the wire.
Q10
[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.
Q11
Rahul is writing the properties of the magnetic field lines choose the correct statements:
[A]. The magnetic field lines originate from the north pole of a magnet and end at its south pole.
[B]. The magnetic field lines come closer to one another near the poles of a magnet but they are widely separated at other places.
[C]. The magnetic field lines do not intersect or crossed one another
[D]. All the above.
Q12
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.
Q13
Neeru is completed her science chapter where she wrote some statements. She wants to know whether the statements are correct or not? Neeru wants to take help from you:
[A]. A concealed current carrying conductor can be located due to the magnetic effect of current by using a plotting compass.
[B]. The magnetic field lines around a straight conductor or straight wire carrying current are concentric circles whose centres lies on the wire.
[C]. The magnitude of magnetic field produced by a straight current carrying wire at a given point is inversely proportional to the distance of that point from the wire.
[D]. When electric current flows vertically downwards then the direction of magnetic field is anticlockwise.
Q14
Ruchika is writing about the factors affecting the strength of an electromagnet. Choose the incorrect statements:
[A]. If we increase the number of turns in the coil, the strength of electromagnet increases.
[B]. If the current in the coil is increased, the strength of electromagnet increases.
[C]. If we reduce the length of air gap between the poles of an electromagnet, then its strength increases
[D]. The strength of an electromagnet cannot be changed by changing the numbers of turns in its coil.
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
In a quiz competition, you are asked a question where you have to choose the statement which is/ are incorrect?
[A]. An electromagnet is a magnet consisting of a long coil of insulated copper wire wrapped around a soft iron core that is magnetized only when electric current is passed through the coil.
[B]. The core of an electromagnet must be soft iron because soft iron losses all of its magnetism when current in the coil is switched off.
[C]. If steel is used for making the core of an electromagnet, the steel does not lost all its magnetism when the current is stopped and it becomes a permanent magnet.
[D]. None of the above.
Q17
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
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
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
Q20
A 3-pin mains plug is fitted to the cable for a 1 kW electric kettle to be used on a 250 V a.c. supply. Which of the following statements is not correct?
[A]. The fuse should be fitted in the live wire
[B]. A 13 A fuse is the most appropriate value to use
[C]. The neutral wire is coloured black
[D]. The green wire should be connected to the earth pin.
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
Badal appeared in class test but he confused to know the correct statement. Would you help him to know that?
[A]. The electric generator converts mechanical energy into electrical energy.
[B]. The alternating current AC produced in India has a frequency of 50 Hertz.
[C]. The electric generator works on the principle that when a straight conductor is moved in a magnetic field, then current is induced in the conductor.
[D]. All the above.
Q24
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.
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
