MCQOPTIONS
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MCQOPTIONS
This section includes 14 Mcqs, each offering curated multiple-choice questions to sharpen your Engineering Physics knowledge and support exam preparation. Choose a topic below to get started.
| 1. |
Which of the following conditions are desired in the core of an electromagnet? |
| A. | High permeability and High retentivity |
| B. | Low permeability and High retentivity |
| C. | High permeability and Low retentivity |
| D. | Low permeability and Low retentivity |
| Answer» D. Low permeability and Low retentivity | |
| 2. |
If the number of atoms in the domain in ferromagnetic iron, in the form of a cube of side length 1μm, is 8.65 X 1010 atoms and dipole moment of each iron atom is 9.27 X 10-24 Am2, what is the maximum Magnetization of the domain? |
| A. | 6 X 105 A/m |
| B. | 7 X 105 A/m |
| C. | 8 X 105 A/m |
| D. | 9 X 105 A/m |
| Answer» D. 9 X 105 A/m | |
| 3. |
What does the following curve show? |
| A. | Magnetization curve |
| B. | Hysteresis curve |
| C. | Polarizing curve |
| D. | Coercive Curve |
| Answer» C. Polarizing curve | |
| 4. |
When a ferromagnetic rod is placed in a solenoid with current, what happens to the rod? |
| A. | Retentivity increases |
| B. | Coercivity Increases |
| C. | Permanently Magnetized |
| D. | Nothing |
| Answer» D. Nothing | |
| 5. |
The value of B at H=0 in a Hysteresis curve is called ___________ |
| A. | Remanence |
| B. | Coercivity |
| C. | Magnetization |
| D. | Porosity |
| Answer» B. Coercivity | |
| 6. |
At high temperature a Ferro magnet becomes __________ |
| A. | Diamagnetic |
| B. | Paramagnetic |
| C. | Hard Ferro magnet |
| D. | Soft Ferro Magnet |
| Answer» C. Hard Ferro magnet | |
| 7. |
Which of the following is not a constituent of Alnico? |
| A. | Iron |
| B. | Aluminum |
| C. | Magnesium |
| D. | Copper |
| Answer» D. Copper | |
| 8. |
Superconductors are diamagnetic materials. |
| A. | True |
| B. | False |
| Answer» B. False | |
| 9. |
Materials in which magnetization persists even after the field has been removed are called ___________ |
| A. | Diamagnetic |
| B. | Paramagnetic |
| C. | Soft Ferro magnets |
| D. | Hard Ferro magnets |
| Answer» E. | |
| 10. |
The phenomenon of perfect diamagnetism is called ___________ |
| A. | Superconductivity |
| B. | Diamagnetic Effect |
| C. | Zero Kelvin Effect |
| D. | Meissner Effect |
| Answer» E. | |
| 11. |
Curie’s law is applicable at every point on a Paramagnetic Material. |
| A. | True |
| B. | False |
| Answer» C. | |
| 12. |
Which of the following is the correct expression for Curie’s law? |
| A. | χ = Cμ0T |
| B. | χ = Cμ0/T |
| C. | μ0 = C χ T |
| D. | μ0 = C χ /T |
| Answer» C. μ0 = C χ T | |
| 13. |
Which of the following is a diamagnetic material? |
| A. | Sodium |
| B. | Calcium |
| C. | Oxygen (at STP) |
| D. | Nitrogen (at STP) |
| Answer» E. | |
| 14. |
If a material is ferromagnetic, what shall be the value of χ? |
| A. | Negative |
| B. | Small and positive |
| C. | Large and Positive |
| D. | Insufficient information |
| Answer» D. Insufficient information | |