The use of permanent magnets is. not made in_____________?

Related Mcqs:

1. Temporary magnets are used in______________?

   A. loud-speakers
   B. generators
   C. motors
   D. all of the above

2. A permanent magnet______________?

   A. attracts some substances and repels others
   B. attracts all paramagnetic substances and repels others
   C. attracts only ferromagnetic substances
   D. attracts ferromagnetic substances and repels all others

3. The working of a meter is based on the use of a permanent magnet. In order to protect the meter functioning from stray magnetic fields______________?

   A. meter is surrounded by strong magnetic fields
   B. a soft iron shielding is used
   C. a plastic shielding is provided
   D. a shielding of anon-magnetic material is used

4. Magnetism of a magnet can be destroyed by_____________?

   A. heating
   B. hammering
   C. by inductive action of another magnet
   D. by all above methods

5. What will be the magnetic potential difference across the air gap of 2 cm length in magnetic field of 200 AT/m ?

   A. 2 AT
   B. 4 AT
   C. 6 AT
   D. 10 AT

6. A rectangular magnet of magnetic moment M is cut into two piece of same length, the magnetic moment of each piece will be______________?

   A. M
   B. M/2
   C. 2 M
   D. M/4

7. The materials are a bit inferior conductors of magnetic flux than air

   A. ferromagnetic
   B. paramagnetic
   C. diamagnetic
   D. dielectric

8. Out of the following statements, concerning an electric field, which statement is not true ?

   A. The electric intensity is a vector quantity
   B. The electric field intensity at a point is numerically equal to the force exerted upon a charge placed at that point
   C. An electric field is defined as a point in space at which an electric charge would experience a force
   D. Unit field intensity in the exertion of a force of one newton on a charge of one coulomb

9. Ferrites are a sub-group of_______________?

   A. non-magnetic materials
   B. ferro-magnetic materials
   C. paramagnetic materials
   D. ferri-magnetic materials

10. Air gap has_________eluctance as compared to iron or steel path?

    A. little
    B. lower
    C. higher
    D. zero