Ncert – class 10 – science -Chapter 12 – Magnetic Effects of Electric Current 1 Welcome to your Ncert - class 10 - science -Chapter 12 – Magnetic Effects of Electric Current 1 1. A bar magnet is immersed in a heap of iron filings and pulled out. The amount of iron filing clinging to the North Pole is much less than the South Pole. Magnet will be same all along its length. North Pole is much more than the South Pole. North Pole is almost equal to the South Pole. None 2. Two magnetic lines of force due to a bar magnet Intersect on the equatorial axis of the magnet Intersect near the poles of the magnet Intersect at the neutral point Do not intersect at all None 3. A current wire produces : neither electric nor magnetic field an electric field a magnetic field both electric and magnetic fields None 4. A current is flowing in electricity line towards north, the direction of magnetic field at a point which is just below the line is : towards north towards east towards west towards south None 5. Electromagnetic induction is Process of developing a magnetic field around a coil by passing electricity through a coil Charging a substance. Process of making electricity by the relative motion of a magnet or a coiled conductor Process of rotating the armature of a generator None 6. If you place a compass near a current conducting wire, it will: Get charged Glow brightly Get hot Get deflected None 7. Magnetic lines of force due to a bar magnet do not intersect because The lines have similar charges and so repel each other A point always has a single net magnetic field None of these The lines always diverge from a single point None 8. Which of the statement given below correctly describes the magnetic field near a long, straight current-carrying conductor? The magnetic lines of force are perpendicular to the conductor going radially outward. The magnetic lines of force are parallel to the conductor on all the sides of the conductor. The magnetic lines of force are in concentric circles with the wire as the center, in a plane perpendicular to the conductor. The magnetic lines of force are in a plane, perpendicular to the conductor in the form of straight lines. None 9. Electromagnetic induction means ......... . motion of the coil around the axle in an electric motor. generation of a current in a coil due to relative motion between the coil and the magnet. charging of an electric conductor. production of magnetic field due to a current flowing through a coil. None 10. With the help of which law the direction of magnetic field due to current carrying conductor be decided? Fleming's right hand rule Faraday's law Right hand thumb rule Fleming's left hand rule None 11. The phenomenon of electromagnetic induction is : the process of rotating a coil of an electric motor. the process of generating a magnetic field dur to current passing through a coil. producing induced current in a coil by relative motion between a magnet and a coil. the process of charging a body None 12. Which of the following statements is false? The magnetic field lines can cross each other The magnetic field lines from close loops. In the region where the magnetic field lines are at a close distance from each other, there will be a strong magnetic field. The direction of magnitude of magnetic field line is from N to S None 13. What is the field line of a magnetic field passing through the centre of current carrying circular ring? Magnetic field is zero at centre Ellipse Circular Straight line None 14. Which of the following correctly describes the magnetic field near a long straight wire? The field consists of radial lines originating from the wire The field consists of straight lines parallel to the wire The field consists of concentric circles centred on the wire.. The field consists of straight lines perpendicular to the wire None 15. A long straight vertical wire carries a current of 1010 amperes flowing upwards through it at a place, where the horizontal component of the earth's magnetic field is0.30.3 gauss. Then the total magnetic field at a point 5 cm from the wire due magnetic north of the wire is: 0.4 gauss 0.7 gauss 0.5 gauss 0.1 gauss None 16. The magnetic field produced in a straight conducting wire on passing the current through it is _______. In the direction of current In the direction opposite to the current Circular around the wire None of these None 17. The direction of magnetic field lines in a region outside the bar magnet are ...................................... from the N pole towards the S pole of a magnet in the direction entering in both the poles of magnet from the S pole towards the N pole of a magnet in the direction coming out from both the poles of magnet None 18. In an electric motor the energy transformation is: from electrical to chemical from mechanical to electrical from electrical to mechanical from chemical to light None 19. A magnet is placed in iron powder and then taken out, then maximum iron powder is at Some away from north pole The middle of the magnet Some away from south pole The end of the magnet None 20. Fleming's left hand rule is used to find None of these Direction of magnetic force acting on conductor Direction of magnetic field Direction of current None Time's up Please Share This Share this content Opens in a new window Opens in a new window Opens in a new window Opens in a new window Opens in a new window Opens in a new window Opens in a new window Opens in a new window Opens in a new window Opens in a new window Leave a Reply Cancel replyCommentEnter your name or username to commentEnter your email address to commentEnter your website URL (optional) Save my name, email, and website in this browser for the next time I comment.
