![\"MCQ](\"https:\/\/i0.wp.com\/mcq-questions.com\/wp-content\/uploads\/2022\/01\/MCQ-Questions.png?resize=159%2C13&ssl=1\")
<\/p>\nQuestion 1.<\/p>\n
(A) The direction of magnetic field at a point is taken to be the direction in which the north pole of a magnetic compass needle points.
\n(B) Magnetic field lines are closed curves.
\n(C) If magnetic field lines are parallel and equidistant, they represent zero field strength.
\n(D) Relative strength of magnetic field is shown by the degree of closeness of the field lines. JJ
\nAnswer:
\n(C) If magnetic field lines are parallel and equidistant, they represent zero field strength.<\/p>\n
Explanation:
\nMagnetic field lines appear parallel when they are far from the magnet. But this does not mean that field strength is zero. No field line would be present where field strength becomes zero.<\/p>\n
<\/p>\n
Question 2.<\/p>\n
(A) The field consists of straight lines perpendicular to the wire.
\n(B) The field consists of straight lines parallel to the wire.
\n(C) The field consists of radial lines originating from the wire.
\n(D) The field consists of concentric circles centered on the wire.
\nAnswer:
\n(D) The field consists of concentric circles centered on the wire.<\/p>\n
Explanation:
\nThe field consists of concentric circles centered on the wire. On applying right-hand thumb rule, we find the direction of magnetic field. The field is in the form of concentric circles centered on the wire carrying current.<\/p>\n
<\/p>\n
Question 3.<\/p>\n
![\"MCQ](\"https:\/\/i0.wp.com\/mcq-questions.com\/wp-content\/uploads\/2022\/01\/MCQ-Questions-for-Chapter-13-Magnetic-Effects-of-Electric-Current-1.png?resize=197%2C164&ssl=1\")
\n(A) directly above the wire.
\n(B) directly below the wire.
\n(C) at a point located in the plane of the paper, on the north side of the wire.
\n(D) at a point located in the plane of the paper, on the south side of the wire.
\nAnswer:
\n(B) directly below the wire.<\/p>\n
Explanation:
\nLine WE shows a straight conductor through which current is moving from E to W. When seen from east, the magnetic field lines appear in clockwise direction, i.e. S to N above the wire and N to S below the wire. This is in accordance with right hand thumb rule.<\/p>\n
Question 4.<\/p>\n
![\"MCQ](\"https:\/\/i2.wp.com\/mcq-questions.com\/wp-content\/uploads\/2022\/01\/MCQ-Questions-for-Chapter-13-Magnetic-Effects-of-Electric-Current-2.png?resize=349%2C256&ssl=1\")
\n(A) concentric circles.
\n(B) lliptical in shape.
\n(C) straight lines parallel to each other.
\n(D) concentric circles near the point O but of elliptical shapes as we go away from it.
\nAnswer:
\n(C) straight lines parallel to each other.<\/p>\n
Explanation:
\nWhen the key is taken out, the circuit is open, no current flows and no magnetic field due to current carrying conductor. There exists only earth’s magnetic field which will exhibit straight lines parallel to each other.<\/p>\n
Question 5.<\/p>\n
(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.
\n(B) The strong magnetic field produced inside the solenoid can be used to magnetise a piece of magnetic material like soft iron, when placed inside the coil.
\n(C) The pattern of the magnetic field associated with the solenoid is different from the pattern of the magnetic field around a bar magnet.
\n(D) The N and S-poles exchange position when the direction of current through the solenoid is reversed.
\nAnswer:
\n(C) The pattern of the magnetic field associated with the solenoid is different from the pattern of the magnetic field around a bar magnet.
\nExplanation: A solenoid behaves like a bar magnet. Hence, the pattern of the magnetic field associated with the solenoid is same as the pattern of the magnetic field around a bar magnet.<\/p>\n
<\/p>\n
Question 6.<\/p>\n
(A) more at the ends than at the centre
\n(B) minimum in the middle
\n(C) same at all points
\n(D) found to increase from one end to the other
\nAnswer:
\n(C) same at all points<\/p>\n
Explanation:
\nMagnetic field lines are straight and parallel inside the solenoid. This indicates a same magnetic field. Hence, inside the solenoid, the magnetic field is same throughout.<\/p>\n
Question 7.<\/p>\n
(A) Mass
\n(B) Speed
\n(C) Velocity
\n(D) Momentum
\nAnswer:
\n(C) Velocity (D) Momentum<\/p>\n
Explanation:
\nWhen a proton enters a magnetic field, it starts moving on a circular path. Because of its movement along a circular path it attains angular momentum. We know that momentum is a product of mass and velocity. Therefore velocity and mass of a proton change when it enters a magnetic field.<\/p>\n
Question 8.<\/p>\n
(A) towards south.
\n(B) towards east.
\n(C) downward.
\n(D) upward.
\nAnswer:
\n(D) upward.<\/p>\n
Explanation:
\nIn accordance with Fleming’s Left-Hand Rule, the direction of magnetic field is vertically upward.<\/p>\n
Question 9.<\/p>\n
(A) the process of charging a body.
\n(B) the process of generating magnetic field due to a current passing through a coil.
\n(C) producing induced current in a coil due to relative motion between a magnet and the coil.
\n(D) the process of rotating a coil of an electric motor.
\nAnswer:
\n(C) producing induced current in a coil due to relative motion between a magnet and the coil.
\nExplanation: In electro-magnetic induction phenomenon, an induced current begins to flow in a coil whenever there is a change in magnetic field in and around a coil.<\/p>\n
Question 10.<\/p>\n
(A) AC generator has an electro-magnet while a DC generator has permanent magnet.
\n(B) DC generator will generate a higher voltage.
\n(C) AC generator will generate a higher voltage.
\n(D) AC generator has slip rings while the DC generator has a commutator.
\nAnswer:
\n(D) AC generator has slip rings while the DC generator has a commutator.<\/p>\n
Explanation:
\nAC generator has slip rings while the DC generator has a commutator.<\/p>\n
<\/p>\n
Question 11.<\/p>\n
(A) two revolutions.
\n(B) one revolution.
\n(C) half revolution.
\n(D) one-fourth revolution.
\nAnswer:
\n(C) half revolution.<\/p>\n
Explanation:
\nWhen a rectangular coil of copper wire is rotated in a magnetic field, the direction of the induced current changes once in each half revolution.<\/p>\n
Question 12.<\/p>\n
(A) Fleming’s right-hand rule is a simple rule to know the direction of induced current.
\n(B) The right-hand thumb rule is used to find the direction of magnetic fields due to current-carrying conductors.
\n(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.
\n(D) In India, the AC changes direction after every 1\/50 second.
\nAnswer:
\n(D) In India, the AC changes direction after every 1\/50 second.<\/p>\n
Explanation:
\nIn India, the AC changes direction after every 1\/100 second.<\/p>\n
Question 13.<\/p>\n
(A) reduces substantially
\n(B) does not change
\n(C) increases heavily
\n(D) vary continuously
\nAnswer:
\n(C) increases heavily<\/p>\n
Explanation:
\nAt the time of short circuiting the live wire and the neutral wire come into direct contact. As a result, the current in the circuit increases abruptly.<\/p>\n
<\/p>\n
Question 14.<\/p>\n
(A) Earthing
\n(B) use of fuse
\n(C) use of stabilisers
\n(D) use of electric meter A
\nAnswer:
\n(B) use of fuse<\/p>\n
Explanation:
\nA fuse is a short length of wire designed to melt in the event of excessive current flow.<\/p>\n
Assertion and Reason Based MCQs\u00a0<\/span><\/p>\n Directions : In the following questions, A statement of Assertion (A) is followed by a statement of Reason (R). Mark the correct choice as. Question 1.<\/p>\n Answer: Explanation: Question 2.<\/p>\n Answer: Explanation: Question 3.<\/p>\n Answer: Explanation: Question 4.<\/p>\n Answer: Explanation: Question 5.<\/p>\n Answer: Explanation: Question 6.<\/p>\n Answer: Explanation: Question 7.<\/p>\n Answer: Explanation: Case-Based MCQs<\/span><\/p>\n Attempt any 4 sub-parts from each question. Each sub-part carries 1 mark. (A) Mechanical to Magnetic Explanation: Question 2.<\/p>\n (A) The bar will be electrocuted resulting in short- circuit. Explanation: Question 3.<\/p>\n (A) a bar magnet Explanation: Question 4.<\/p>\n (A) The magnetic field produced by the solenoid is inversely proportional to the current. (A) Only IV Explanation: Question 5.<\/p>\n (A) For a current of 0.8A the magnetic field is 13 mT Explanation: II. Study the given diagram and answer any of the four questions form Question 1. to Question 5. Question 1.<\/p>\n (A) Key K is open Explanation: Question 2.<\/p>\n (A) Electromagnetic induction Explanation: Question 3.<\/p>\n (A) By changing magnetic field Explanation: Question 4.<\/p>\n (A) Flemings right hand rule Explanation: Question 5.<\/p>\n (A) Direction of magnetic field Explanation: III. Read the following passage and answer any four questions from Question 1. to Question 5. Question 1.<\/p>\n (A) Due to external force applied on the magnet. Explanation: Question 2.<\/p>\n (A) North pole and south pole of the magnet Explanation: Question 3.<\/p>\n (A) Magnetic field is strongest near the poles of the magnet. Explanation: Question 4.<\/p>\n (A) Magnetic field in that region is weak Explanation: Question 5.<\/p>\n (A) Pascal Explanation: Magnetic Effects of Electric Current Class 10 MCQ Questions With Answers Question 1. Choose the incorrect statement from the following regarding magnetic lines of field : (A) The direction of magnetic field at a point is taken to be the direction in which the north pole of a magnetic compass needle points. (B) Magnetic field …<\/p>\n
\n(A) Both A and R are true and R is the correct explanation of A.
\n(B) Both A and R are true but R is NOT the correct explanation of A.
\n(C) A is true but R is false.
\n(D) A is false and R is true.<\/p>\nAssertion (A): Two bar magnets attract when they are brought near to each other with the same pole.
\nReason (R): Unlike poles will attract each other.<\/h2>\n
\n(D) A is false and R is true.<\/p>\n
\nTwo bar magnets repel when same poles face each other. Opposite poles attract each other<\/p>\n<\/p>\nAssertion (A): Magnetic field lines never intersect.
\nReason (R): At a particular point magnetic field has only one direction.<\/h2>\n
\n(A) Both A and R are true and R is the correct explanation of A.<\/p>\n
\nMagnetic field lines never intersect each other as for two lines to intersect, there must be two north directions at a point, which is not possible.<\/p>\nAssertion (A): In Fleming’s Left Hand Rule, the direction of magnetic field, force and current are mutually perpendicular.
\nReason (R): Fleming’s Left hand Rule is applied to measure the induced current.<\/h2>\n
\n(C) A is true but R is false.<\/p>\n
\nIt is used to find the direction of force in a current carrying conductor in the presence of magnetic field.<\/p>\nAssertion (A): An alpha particle placed in a magnetic field will not experience any force, if it moves in the magnetic field parallel to field lines.
\nReason (R): The force is zero if current and field are in the same direction.<\/h2>\n
\n(A) Both A and R are true and R is the correct explanation of A.<\/p>\n
\nAn alpha particle placed in a magnetic field will not experience any force, if it moves in the magnetic field parallel to field lines. It is because, the force is zero if current and field is in the same direction.<\/p>\nAssertion (A): Safety fuses are made up of materials having a low melting point.
\nReason (R): Safety fuses should be resistant to electric current.<\/h2>\n
\n(C) A is true but R is false.<\/p>\n
\nSafety fuses are made up of materials having a low melting point so that when excess current flow through the circuit,
\nthe fuse melts breaking the circuit and thus prevents appliances.<\/p>\nAssertion (A): Copper is used to make electric wires.
\nReason (R): Copper has very low electrical resistance.<\/h2>\n
\n(A) Both A and R are true and R is the correct explanation of A.<\/p>\n
\nThe low electrical resistance of copper makes it a good conductor for electricity.<\/p>\n<\/p>\nAssertion (A): When two bulbs are operated on same voltage supply, having power 60 W and 100 W then 100 W bulb has less resistance than 60 W. Reason (R): The power of the bulb is directly proportional to the square of the voltage.<\/h2>\n
\n(B) Both A and R are true but R is NOT the correct explanation of A.<\/p>\n
\nSince, power (P) Hence, 100 W bulb has less resistance.<\/p>\n
\nI. Read the following passage and answer any four questions from Question 1. to Question 5.
\nA solenoid is a long helical coil of wire through which a current is run in order to create a magnetic field. The magnetic field of the solenoid is the superposition of the fields due to the current through each coil. It is nearly uniform inside the solenoid and close to zero outside and is similar to the field of a bar magnet having a north pole at one end and a south pole at the other depending upon the direction of current flow.
\nThe magnetic field produced in the solenoid is dependent on a few factors such as, the current in the coil, number of turns per unit length etc. The following graph is obtained by a researcher while doing an experiment to see the variation of the magnetic field with respect to the current in the solenoid.
\nThe unit of magnetic field as given in the graph attached is in mili-Tesla (mT) and the current is given in Ampere.<\/p>\n![\"MCQ](\"https:\/\/i1.wp.com\/mcq-questions.com\/wp-content\/uploads\/2022\/01\/MCQ-Questions-for-Chapter-13-Magnetic-Effects-of-Electric-Current-3.png?resize=303%2C225&ssl=1\")
\nQuestion 1.<\/p>\nWhat type of energy conversion is observed in a linear solenoid?<\/h2>\n
\n(B) Electrical to Magnetic
\n(C) Electrical to Mechanical
\n(D) Magnetic to Mechanical
\nAnswer:
\n(B) Electrical to Magnetic<\/p>\n
\nIn a solenoid, the current flowing through the circuit generates its own magnetic field. Hence the electrical energy of the circuit is converted to magnetic field.<\/p>\n<\/p>\nWhat will happen if a soft iron bar is placed inside the solenoid?<\/h2>\n
\n(B) The bar will be magnetised as long as there is current in the circuit.
\n(C) The bar will be magnetised permanently.
\n(D) The bar will not be affected by any meAnswer:
\nAnswer:
\n(B) The bar will be magnetised as long as there is current in the circuit.<\/p>\n
\nThe magnetic field produced by the solenoid will be reinforced by the iron bar and it will be magnetised as long as there is current in the circuit.<\/p>\nThe magnetic field lines produced inside the solenoid are similar to that of… A<\/h2>\n
\n(B) a straight current carrying conductor
\n(C) a circular current carrying loop
\n(D) electromagnet of any shape
\nAnswer:
\n(A) a bar magnet<\/p>\n
\nSolenoids mimic bar magnets. The magnetic field of a solenoid are similar to that of a bar magnet and just like a bar magnet a solenoid also has north and south poles.<\/p>\nAfter analysing the graph a student writes the following statements.<\/h2>\n
\n(B) The magnetic field produced by the solenoid is directly proportional to the current.
\n(C) The magnetic field produced by the solenoid is directly proportional to square of the current.
\n(D) The magnetic field produced by the solenoid is independent of the current. Choose from the following which of the following would be the correct statement(s).<\/p>\n
\n(B) I and III and IV
\n(C) I and II
\n(D) Only II
\nAnswer:
\n(D) Only II<\/p>\n
\nAs can be seen from the graph the magnetic field is increasing linearly with current. Therefore, the current is directly proportional to the magnetic field.<\/p>\nFrom the graph deduce which of the following statements is correct ?<\/h2>\n
\n(B) For larger currents, the magnetic field increases non-linearly.
\n(C) For a current of 0.8A the magnetic field is 1.3 mT
\n(D) There is not enough information to find the magnetic field corresponding to 0.8A current.
\nAnswer:
\n(A) For a current of 0.8A the magnetic field is 13 mT<\/p>\n
\nFrom the above graph we can see that 0.8 A corresponds to 13 mT magnetic field.<\/p>\n
\nIn the given diagram, two coils of insulated copper wire are wound over a nonconducting cylinder as shown. Coil P has larger number of turns.
\n![\"MCQ](\"https:\/\/i1.wp.com\/mcq-questions.com\/wp-content\/uploads\/2022\/01\/MCQ-Questions-for-Chapter-13-Magnetic-Effects-of-Electric-Current-4.png?resize=383%2C131&ssl=1\")
<\/p>\nA momentary deflection is shown by the galvanometer, when:<\/h2>\n
\n(B) Key K is closed
\n(C) In both the situations
\n(D) In neither of the case.
\nAnswer:
\n(C) In both the situations<\/p>\n
\nMomentary deflection is seen in both the cases. When the key K is open, deflection is shown by the galvanometer and when it is closed, a momentary deflection is seen in opposite direction.<\/p>\n<\/p>\nWhich phenomenon is involved in it ?<\/h2>\n
\n(B) Magnetism
\n(C) Electromagnetism
\n(D) None of these
\nAnswer:
\n(A) Electromagnetic induction<\/p>\n
\nElectromagnetic induction is the process by which a changing magnetic field in a conductor induces current in another conductor.<\/p>\nIn above phenomenon, the current is induced in another conductor,<\/h2>\n
\n(B) By increasing the strength of current
\n(C) By decreasing the strength of the current
\n(D) By using extra wire.
\nAnswer:
\n(A) By changing magnetic field<\/p>\n
\nElectromagnetic current is induced in another conductor by changing the magnetic field.<\/p>\nThe rule which helps us to know direction of induced current:<\/h2>\n
\n(B) Flemings left hand rule
\n(C) Electro magnetic induction
\n(D) Faraday’s Law
\nAnswer:
\n(A) Flemings right hand rule<\/p>\n
\nFlemings right hand rule helps us to know the direction of induced current.<\/p>\nFlemings right hand rule explains:<\/h2>\n
\n(B) Direction of motion of conductor
\n(C) Only (a)
\n(D) Both (a) and (b)
\nAnswer:
\n(D) Both (a) and (b)<\/p>\n
\nIn Fleming’s Right Hand Rule the first three fingers of the right hand are mutually perpendicular to each other such that the forefinger gives the direction of magnetic field and the thumb points in the direction of the motion of a conductor then, the middle finger will give the direction of the induced current.<\/p>\n<\/p>\n
\nA student fixes a sheet of white paper on a drawing board. He places a bar magnet in the centre of it. He sprinkles some iron filings uniformly around the bar magnet. Then he taps the board gently and observes that the iron filings arrange themselves in a particular pattern.<\/p>\nWhy do the iron fillings arrange themselves in a particular pattern ?<\/h2>\n
\n(B) Due to force exerted by the magnet outside the magnetic field.
\n(C) Due to the force exerted by magnet within its magnetic field.
\n(D) Due to pressure of magnetic field.
\nAnswer:
\n(C) Due to the force exerted by magnet within its magnetic field.<\/p>\n
\nIt is due to the force exerted by the magnet within its magnetic field.<\/p>\nWhat do the lines along which the iron fillings align represent ?<\/h2>\n
\n(B) Strength of the magnet
\n(C) Magnetic field lines
\n(D) Gravitational force.
\nAnswer:
\n(C) Magnetic field lines<\/p>\n
\nThe lines represent magnetic field lines.<\/p>\nWhat does the crowding of iron filings at the end of the magnet indicate?<\/h2>\n
\n(B) Magnetic field is weakest near the poles of the magnet.
\n(C) There is no significant magnetic field at the poles of the magnet.
\n(D) The significance of polarity
\nAnswer:
\n(A) Magnetic field is strongest near the poles of the magnet.<\/p>\n
\nCrowding of iron filings at the ends of the magnet indicates that the magnetic field is strongest near the poles of the magnet.<\/p>\n<\/p>\nThe closer field lines indicate:<\/h2>\n
\n(B) Magnetic field in that region is strong.
\n(C) Magnetic field in that region is zero.
\n(D) North and South poles are closer.
\nAnswer:
\n(B) Magnetic field in that region is strong.<\/p>\n
\nThe strength of magnetic field is indicated by the closeness of the field lines. Closer the lines, more will be the strength and farther the lines, lesser will be the field strength.<\/p>\nWhat is SI unit of magnetic field:<\/h2>\n
\n(B) Nm2
\n(C) Tesla
\n(D) No unit
\nAnswer:
\n(C) Tesla<\/p>\n
\nTesla is the SI unit of magnetic field.<\/p>\nMCQ Questions for Class 10 Science with Answers<\/a><\/h4>\n","protected":false},"excerpt":{"rendered":"