MCQ Questions for Class 10 Science Chapter 13 Magnetic Effects of Electric Current
Here we are providing MCQ questions for class 10 science chapter 13 Magnetic effects of Electric Current. These questions useful for your exam, are prepared by subject expert. Practicing these questions will help you to perform better in the exam.
Q.1. The magnetic field lines in the middle of the current carrying solenoid are
(a) circles
(b) spirals
(c) parallel to the axis of the tube
(d) perpendicular to the axis of the tube
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Answer: (c)Q.2. 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
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Answer: (c)Q.3. A magnet attracts:
(a) plastics
(b) carbon
(c) aluminium
(d) iron and steel
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Answer: (d)Q.4. The most suitable material for making the core of an electromagnet is:
(a) soft iron
(b) brass
(c) aluminium
(d) steel
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Answer: (a) Soft iron is the most suitable material for making the core of an electromagnetQ.5. 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 of 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
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Answer: (c)Q.6. The force experienced by a current-carrying conductor placed in a magnetic field is the largest when the angle between the conductor and the magnetic field is:
(a) 45
(b) 60
(c) 90
(d) 180
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Answer: (c)Q.7. Magnetic lines do not intersect on one-another because
(a) they are at a distance
(b) they are in the same direction
(c) they are parallel to another
(d) at the point of intersection there will be two direction of the magnetic force which is impossible
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Answer: (d)Q.8. In an electric motor, the direction of current in the coil changes once in each:
(a) two rotations
(b) one rotation
(c) half rotation
(d) one-fourth rotation
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Answer: (c) The direction of current changes in each half rotation in an electric motor.Q.9. A small magnet is placed perpendicular to a uniform magnet field. The forces acting on the magnet will result in
(a) Rotational motion
(b) Translatory motion
(c) No motion at all
(d) Translational and rotational motion both
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Answer: (a)Q.10. The front face of a circular wire carrying current behaves like a north pole, The direction of current in this face of the circular wire is:
(a) clockwise
(b) downwards
(c) anticlockwise
(d) upwards
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Answer: (c)Q.11. An electron beam enters a magnetic field at right angles to it as shown in the Figure.
The direction of force acting on the electron beam will be:
(a) to the left
(b) to the right
(c) into the page
(d) out of the page
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Answer: (c)Q.12. By removing the inducing magnet, the induced magnetism is
(a) Finished after some time
(b) Finished just after
(c) Not finished for a long time
(d) Not changed
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Answer: (b)Q.13. The force exerted on a current-carrying wire placed in a magnetic field is zero when the angle between the wire and the direction of magnetic field is:
(a) 45o
(b) 60o
(c) 90o
(d) 180o
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Answer: (d)Q.14. A current carrying wire in the neighbour hood produces
(a) no field
(b) electric and magnetic fields
(c) electric field only
(d) magnetic field only
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Answer: (d)Q.15. A circular loop placed in a plane perpendicular to the plane of paper carries a current when the key is ON.
The current as seen from points A and B (in the plane of paper and on the axis of the coil) is anti clockwise and clockwise respectively. The magnetic field lines point from B to A. The N-pole of the resultant magnet is on the face close to
(a) A
(b) B
(c) A if the current is small, and B if the current is large
(d) B if the current is small and A if the current is large
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Answer: (a)Q.16. The magnetic lines of force, inside a current carrying solenoid, are
(a) along the axis and are parallel to each other
(b) perpendicular to the axis and equidistance from each other
(c) circular and they do not intersect each other
(d) circular at the ends but they are parallel to the axis inside the solenoid.
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Answer: (a)Q.17. Which one of the following substances is the magnetic substances?
(a) Mercury
(b) Iron
(c) Gold
(d) Silver
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Answer: (b)Q.18. Which of the following determines the direction of magnetic field due to a current carrying conductor?
(a) Faraday’s laws of electromagnetic induction
(b) Fleming’s left-hand rule
(c) Lenz’s rule
(d) Maxwell’s cork screw rule
Show Answer
Answer: (d)Q.19. The value of magnetic field due to a small element of current carrying conductor at a distance r and lying on the plane perpendicular to the element of conductor is
(a) zero
(b) maximum
(c) inversely proportional to the current
(d) none of the above
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Answer: (b)Q.20. The direction of magnetic lines of forces close to a straight conductor carrying current will be
(a) along the length of the conductor
(b) radially outward
(c) circular in a plane perpendicular to the conductor
(d) helical
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Answer: (c)Q.21. Along the direction of current carrying wire, the value of magnetic field is
(a) zero
(b) infinity
(c) depends on the length of the wire
(d) uncertain
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Answer: (a)Q.22. The laws of electromagnetic induction have been used in the construction of a
(a) galvanometer
(b) voltmeter
(c) electric motor
(d) generator
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Answer: (d)Q.23. When an electron beam is moving in a magnetic field, then the work done is equal to the
(a) charge of electron
(b) magnetic field
(c) product of electronic charge and the magnetic field
(d) zero
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Answer: (d)Q.24. Two identical coaxial circular loops carry a current i each circulating in the same direction. If the loops approach each other, you will observe that
(a) the current in each increases,
(b) the current in each decreases,
(c) the current in each remains the same,
(d) the current in one increases whereas that in the other decreases
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Answer: (b)Q.25. The device used for producing electric current is called a
(a) generator
(b) galvanometer
(c) ammeter
(d) motor
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Answer: (a)Q.26. An induced e.m.f. is produced when a magnet is plunged into a coil. The strength of the induced e.m.f. is independent of
(a) the strength of the magnet
(b) number of turns of coil
(c) the resistivity of the wire of the coil
(d) speed with which the magnet is moved
Show Answer
Answer: (c)Q.27. A current carrying loop lying in a magnetic field behaves like a.
(a) A magnetic dipole
(b) magnetic pole
(c) magnetic material
(d) non-magnetic material
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Answer: (a)Q.28. Direction of induced e.m.f. is determined by –
(a) Fleming’s left hand rule
(b) Fleming’s right hand rule
(c) Maxwell’s rule
(d) Ampere’s rule of swimming
Show Answer
Answer: (b)Q.29. 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.
Show Answer
Answer: (c)Q.30. The direction of induced current is obtained by
(a) Fleming’s left hand rule
(b) Maxwell’s cork-screw rule
(c) Ampere’s rule
(d) Fleming’s right hand rule
Show Answer
Answer: (d)Q.31. The current in a generator armature is AC because
(a) the magnetic field reverses at intervals
(b) the current in the field coils is AC
(c) the rotation of the armature causes the field through it to reverse
(d) the commutator feeds current into it in opposite directions every half cycle
Show Answer
Answer: (c)Q.32. The current in the armature of a motor is reversed every half cycle due to the action of a(n)
(a) armature
(b) field coil
(c) brush
(d) commutator.
Show Answer
Answer: (d)Q.33. When a bar magnet is broken into two pieces?
(a) we will have a single pole on each piece
(b) each piece will have two like poles
(c) each piece will have two unlike poles
(d) each piece will be lose magnetism
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Answer: (c)Q.34. In an electric motor, the energy transformation is
(a) from electrical to chemical
(b) from chemical to light
(c) from mechanical to electrical
(d) from electrical to mechanical
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Answer: (d)Q.35. A magnet is moved towards a coil (i) quickly (ii) slowly, then the induced e.m.f. is
(a) larger in case (i)
(b) smaller in case (i)
(c) equal in both the cases
(d) larger or smaller depending upon the radius of the coil
Show Answer
Answer: (a)Q.36. A metal sheet is placed in a variable magnetic field which is increasing from zero to maximum. Induced current flows in the directions as shown in figure. The direction of magnetic field will be –
(a) normal to the paper, inwards
(b) normal to the paper, outwards
(c) from east to west
(d) from north to south
Show Answer
Answer: (b)Q.37. Whenever the magnetic flux linked with a coil changes, an induced e.m.f. is produced in the circuit. The e.m.f. lasts
(a) for a short time
(b) for a long time
(c) for ever
(d) so long as the change in flux takes place
Show Answer
Answer: (d)Q.38. A magnet NS is placed along the axis of a circular coil. The magnet is moved away from the coil. The induced current in the coil is:
(a) Zero
(b) Clockwise
(c) Anti-clockwise
(d) None of these
Show Answer
Answer: (b) The induced current in coil is in clockwise direction when N pole of powerful magnet is moved to right.Q.39. In an electric motor, conversion takes place of
(a) Chemical energy into electrical energy
(b) Electrical energy into mechanical energy
(c) Electrical energy into light
(d) Electrical energy into chemical energy
Show Answer
Answer: (b)Q.40. Four situations are given below-
I. An infinitely long wire carrying current
II. A rectangular loop carrying current
III. A solenoid of finite length carrying current
IV. A circular loop carrying current.
In which of the above cases will the magnetic field produced be like that of a bar magnet?
(a) I
(b) I and III
(c) Only III
(d) Only IV
Show Answer
Answer: (c) A long coil of finite length of wire carrying current consisting of closely packed loops is called solenoid whose magnetic field resembles that of a bar magnet.Q.41. The laws of electromagnetic induction have been used in the construction of a
(a) galvanometer
(b) voltmeter
(c) electric motor
(d) generator
Show Answer
Answer: (d)Q.42. The permanent magnets are kept with soft iron pieces at ends as keepers
(a) to magnetise the soft iron pieces
(b) to increase the strength of the magnets
(c) to avoid self demagnetisation
(d) for physical safety of the magnets
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Answer: (c)Q.43. The similar magnets of steel are …………….. than the magnets of soft iron
(a) stronger
(b) of equal strength
(c) weaker
(d) none of the above
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Answer: (c)Q.44. The value of intensity of magnetic field at a point due to a current carrying conductor depends
(a) Only on the value of current
(b) Only on a small part of length of conductor
(c) On angle between the line joining the given point to the mid point of small length and the distance between the small length and the given point
(d) On all of the above
Show Answer
Answer: (d)Q.45. A bar of soft iron is placed flat on the table. A bar magnet is taken and its south pole is placed on one end of the bar of soft iron. The magnet is held almost vertically. The bar is stroked from one end to the other with magnet. On the other end of the bar, magnet is lifted and again placed on the first end and the bar is again stroked. The end of the bar where the magnet is lifted will be
(a) south pole
(b) no pole
(c) south and north both type
(d) north pole
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Answer: (d)Related Posts
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