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 current is flowing in electricity line towards north, the direction of magnetic field at a point which is just below the line is : towards east towards west towards north towards south None 2. With the help of which law the direction of magnetic field due to current carrying conductor be decided? Fleming's left hand rule Faraday's law Right hand thumb rule Fleming's right hand rule None 3. 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 0.1 gauss 0.5 gauss None 4. In an electric motor the energy transformation is: from chemical to light from electrical to chemical from electrical to mechanical from mechanical to electrical None 5. Fleming's left hand rule is used to find Direction of magnetic force acting on conductor Direction of magnetic field None of these Direction of current None 6. A magnet is placed in iron powder and then taken out, then maximum iron powder is at Some away from north pole Some away from south pole The middle of the magnet The end of the magnet None 7. Two magnetic lines of force due to a bar magnet Intersect at the neutral point Intersect near the poles of the magnet Intersect on the equatorial axis of the magnet Do not intersect at all None 8. A bar magnet is immersed in a heap of iron filings and pulled out. The amount of iron filing clinging to the 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. North Pole is much less than the South Pole. None 9. Which of the following statements is false? The magnetic field lines from close loops. The direction of magnitude of magnetic field line is from N to S The magnetic field lines can cross each other In the region where the magnetic field lines are at a close distance from each other, there will be a strong magnetic field. None 10. Electromagnetic induction means ......... . charging of an electric conductor. production of magnetic field due to a current flowing through a coil. generation of a current in a coil due to relative motion between the coil and the magnet. motion of the coil around the axle in an electric motor. None 11. Which of the following correctly describes the magnetic field near a long straight 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 radial lines originating from the wire The field consists of straight lines perpendicular to the wire None 12. 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 13. Electromagnetic induction is Process of making electricity by the relative motion of a magnet or a coiled conductor Process of rotating the armature of a generator Process of developing a magnetic field around a coil by passing electricity through a coil Charging a substance. None 14. The magnetic field produced in a straight conducting wire on passing the current through it is _______. None of these Circular around the wire In the direction of current In the direction opposite to the current None 15. If you place a compass near a current conducting wire, it will: Get hot Glow brightly Get deflected Get charged None 16. A current wire produces : both electric and magnetic fields an electric field a magnetic field neither electric nor magnetic field None 17. The phenomenon of electromagnetic induction is : producing induced current in a coil by relative motion between a magnet and a coil. the process of generating a magnetic field dur to current passing through a coil. the process of rotating a coil of an electric motor. the process of charging a body None 18. Which of the statement given below correctly describes the magnetic field near a long, straight current-carrying conductor? The magnetic lines of force are parallel to the conductor on all the sides of the conductor. The magnetic lines of force are perpendicular to the conductor going radially outward. 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 19. The direction of magnetic field lines in a region outside the bar magnet are ...................................... from the S pole towards the N pole of a magnet in the direction coming out from both the poles of magnet in the direction entering in both the poles of magnet from the N pole towards the S pole of a magnet None 20. Magnetic lines of force due to a bar magnet do not intersect because None of these The lines always diverge from a single point The lines have similar charges and so repel each other A point always has a single net magnetic field 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.
