# MCQ Questions for Class 10 Science Chapter 13 Magnetic Effects of Electric Current

MCQ Questions for Class 10 Science Chapter 13 Magnetic Effects of Electric Current can be a useful tool for developing skills such as critical thinking and problem solving. Having a solid understanding of MCQs can help you better prepare for your exams and ultimately improve your marks.

Chapter 13 Class 10 Science MCQ questions are a great way for students to learn and review basic concepts quickly. It can help students identify any gaps in their understanding.

## Chapter 13 Magnetic Effects of Electric Current Class 10 Science MCQ Questions

1. 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 magnetise 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.
▶ (c) The pattern of the magnetic field associated with the solenoid is different from the pattern of the magnetic field around a bar magnet.

2. A rectangular coil of copper wires is rotated in a magnetic field. The direction of the induced current changes once in each:
(a) Two revolutions
(b) One revolution
(c) Half revolution
(d) One-fourth revolution
▶ (c) Half revolution

3. A magnetic field exerts no force on
(a) a stationary electric charge
(b) a magnet
(c) an electric charge moving perpendicular to its direction
(d) an unmagnetised iron bar.
▶ (a) a stationary electric charge

4. The strength of magnetic field inside a long current carrying straight solenoid is :
(a) More at the ends than at the centre
(b) Minimum in the middle
(c) Same at all points
(d) Found to increase from one end to the other
▶ (c) Same at all points

5. 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 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.
▶ (c) If magnetic field lines are parallel and equidistant, they represent zero field strength.

6. Induced current flows through a coil
(a) for more than the period during which flux changes through it.
(b) for less than the period during which flux changes through it.
(c) only for the period during which flux changes through it.
(d) none of the above.
▶ (c) only for the period during which flux changes through it.

7. An electric charge in uniform motion produces
(a) an electric field only
(b) a magnetic field only
(c) both electric and magnetic fields
(d) no such field at all
▶ (c) both electric and magnetic fields

8. Which of the following instruments works by electromagnetic induction?
(a) Dynamo.
(b) Moving coil galvanometer.
(d) Simple motor.
▶ (a) Dynamo.

9. A soft iron bar is introduced inside a current carrying solenoid. The magnetic field inside the solenoid
(a) will increase
(b) will remain unaffected
(c) will become zero
(d) will decrease
▶ (a) will increase

10. A positively-charged particle (alpha-particle projected towards west is deflected towards north by a magnetic field. The direction of magnetic field is
(a) Towards south.
(b) Towards east.
(c) Downward.
(d) Upward.
▶ (d) Upward.

11. A rectangular coil of copper wires is rotated in a magnetic field. The direction of the induced current change once in each
(a) two revolutions
(b) one revolution
(c) half revolution
(d) one-fourth revolution
▶ (c) half revolution

12. 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.
▶ (c) Producing induced current in a coil due to relative motion between a magnet and the coil.

13. For making a strong electromagnet, the material of the core should be
(a) brass
(b) laminated steel strips
(c) soft iron
(d) steel
▶ (c) soft iron

14. The direction of magnetic field around a straight conductor carrying current can be determined by
(a) Fleming’s left hand rule
(b) Lenz’s law
(c) Right hand thumb rule
(d) Fleming’s right hand rule.
▶ (c) Right hand thumb rule

15. Who has stated the Right hand Thumb Rule?
(a) Orsted
(b) Fleming
(c) Einstein
(d) Maxwell
▶ (d) Maxwell

16. Magnetic field is produced by the flow of current in a straight wire. This phenomenon was discovered by
(a) Coulomb
(b) Oersted
(d) Maxwell
▶ (b) Oersted

17. The phenomena 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
▶ (c) producing induced current in a coil due to relative motion between a magnet and the coil

18. What will happen if a soft iron bar is placed inside the solenoid?
(a) The bar will be electrocuted resulting in short- circuit.
(b) The bar will be magnetised as long as there is current in the circuit.
(c) The bar will be magnetised permanently.
(d) The bar will not be affected by any means.
▶ (b) The bar will be magnetised as long as there is current in the circuit.

19. 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
▶ (a) split-ring type commutator must be used

20. If a charged particle is moving along a magnetic field line. The magnetic force on the particle is
(a) along its velocity
(b) opposite to its velocity
(c) perpendicular to its velocity
(d) zero
▶ (d) zero

21. 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
▶ (b) use of fuse

22. If the current values periodically from zero to a maximum value, back to zero and then reverses its direction, the current is
(a) direct
(b) alternative
(c) pulsating
(d) none of the above
▶ (b) alternative

23. A D.C generator works on the principle of
(a) ohm’s law
(b) Joule’s law of heating
(c) faraday’s law of electromagnetic induction.
(d) none of the above
▶ (c) faraday’s law of electromagnetic induction.