Magnetic Materials
High-Yield Trend
Questions 12 MCQs
Above Curie temperature:
1. a ferromagnetic substance becomes paramagnetic.
2. a paramagnetic substance becomes diamagnetic.
3. a diamagnetic substance becomes paramagnetic.
4. a paramagnetic substance becomes ferromagnetic.
Nickel shows the ferromagnetic property at room temperature. If the temperature is increased beyond Curie's temperature, then it will show:
1. paramagnetism
2. anti-ferromagnetism
3. no magnetic property
4. diamagnetism
1. Ferromagnetic material becomes paramagnetic material.
2. Paramagnetic material becomes diamagnetic material.
3. Paramagnetic material becomes ferromagnetic material.
4. Ferromagnetic material becomes diamagnetic material.
If a diamagnetic substance is brought near the north or the south pole of a bar magnet, it is:
| 1. | repelled by both the poles |
| 2. | repelled by the north pole and attracted by the south pole |
| 3. | attracted by the north pole and repelled by the south pole |
| 4. | attracted by both the poles |
Electromagnets are made of soft iron because soft iron has:
1. low retentivity and high coercive force
2. high retentivity and high coercive force
3. low retentivity and low coercive force
4. high retentivity and low coercive force
| (i) | is feebly repelled. | (ii) | is feebly attracted. |
| (iii) | is strongly attracted. | (iv) | remains unaffected. |
Which one of the following is true?
| 1. | is of a diamagnetic material. |
| 2. | is of a ferromagnetic material. |
| 3. | is of a non-magnetic material. |
| 4. | is of a paramagnetic material. |
A compass needle which is allowed to move in a horizontal plane is taken to a geomagnetic pole. It:
1. will become rigid showing no movement
2. will stay in any position
3. will stay in north-south direction only
4. will stay in east-west direction only
If and are the apparent angles of dip observed in two vertical planes at right angles to each other, then the true angle of dip is given by:
1.
2.
3.
4.
A thin diamagnetic rod is placed vertically between the poles of an electromagnet. When the current in the electromagnet is switched on, then the diamagnetic rod is pushed up, out of the horizontal magnetic field. Hence the rod gains gravitational potential energy. The work required to do this comes from:
| 1. | the current source |
| 2. | the magnetic field |
| 3. | the lattice structure of the material of the rod |
| 4. | the induced electric field due to the changing magnetic field. |
At point A on the earth's surface, the angle of dip is, . At a point B on the earth's surface, the angle of dip is, . We can interpret that:
| 1. | A and B are both located in the southern hemisphere. |
| 2. | A and B are both located in the northern hemisphere. |
| 3. | A is located in the southern hemisphere and B is located in the northern hemisphere. |
| 4. | A is located in the northern hemisphere and B is located in the southern hemisphere. |
| List-I Material | List-II Susceptibility | ||
| Diamagnetic | |||
| Ferromagnetic | |||
| Paramagnetic | |||
| Non-magnetic | (a small positive number) | ||
| 1. | 2. | ||
| 3. | 4. |
| A. | hold the sheet there if it is magnetic. |
| B. | hold the sheet there if it is non-magnetic. |
| C. | move the sheet away from the pole with uniform velocity if it is conducting. |
| D. | move the sheet away from the pole with uniform velocity if it is both, non-conducting and non-polar. |
| 1. | A and C only | 2. | A, C and D only |
| 3. | C only | 4. | B and D only |