MCQOPTIONS
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MCQOPTIONS
This section includes 35 Mcqs, each offering curated multiple-choice questions to sharpen your Physics knowledge and support exam preparation. Choose a topic below to get started.
| 1. |
A magnetic compass needle always points in? |
| A. | North Direction |
| B. | South Direction |
| C. | East Direction |
| D. | West Direction |
| Answer» B. South Direction | |
| 2. |
A powerful magnet loses its magnetism when: |
| A. | A high mechanical stress is applied on it |
| B. | A high electric field is applied on it |
| C. | It is heated to very high temperature |
| D. | It is buried inside the earth for a long time |
| Answer» D. It is buried inside the earth for a long time | |
| 3. |
Diamagnetic substances are those which have tendency to move from ______________ by a magnet. |
| A. | stronger to the weaker part of the external magnetic field and it would be repelled |
| B. | stronger to the weaker part of the external magnetic field and it would be attracted |
| C. | weaker to the stronger part of the external magnetic field and it would be repelled |
| D. | weaker to the stronger part of the external magnetic field and it would be attracted |
| Answer» B. stronger to the weaker part of the external magnetic field and it would be attracted | |
| 4. |
Hard ferrites are used for making ______. |
| A. | Light weight permanent magnet |
| B. | Transformer cores |
| C. | Electrical machinery |
| D. | High frequency equipment |
| Answer» B. Transformer cores | |
| 5. |
In the magnetic meridian of a certain place, the horizontal component of the Earth's magnetic field is 0.26 units and the angle of dip is 60°.What is the magnetic field of the Earth at this location ? |
| A. | 0.52 units |
| B. | 0.13 units |
| C. | 15.6 units |
| D. | 60.26 units |
| Answer» B. 0.13 units | |
| 6. |
On keeping a paramagnetic material in a magnetic field, the magnetic flux density inside the material is likely to: |
| A. | increase |
| B. | decrease |
| C. | reduce to zero |
| D. | remain the same |
| Answer» B. decrease | |
| 7. |
For paramagnetic materials, magnetic susceptibility (χ) is ________. |
| A. | positive and small |
| B. | negative and small |
| C. | negative and large |
| D. | positive and large |
| Answer» B. negative and small | |
| 8. |
For ferromagnetic materials magnetic susceptibility (χ) is ________. |
| A. | positive and large |
| B. | positive and small |
| C. | negative and large |
| D. | negative and small |
| Answer» B. positive and small | |
| 9. |
For diamagnetic material's magnetic susceptibility (χ) is __________. |
| A. | positive and small |
| B. | negative and large |
| C. | negative and small |
| D. | positive and large |
| Answer» D. positive and large | |
| 10. |
Diamagnetic susceptibility is very |
| A. | small and negative |
| B. | small and positive |
| C. | large and negative |
| D. | large and positive |
| Answer» B. small and positive | |
| 11. |
Iron is ferromagnetic |
| A. | At all temperature |
| B. | At NTP |
| C. | Above 770° C |
| D. | Below 770° C |
| Answer» D. Below 770° C | |
| 12. |
According to Curie-Weiss law |
| A. | \(\chi = \dfrac{C}{T-\theta}\) |
| B. | \(\chi = \dfrac{C}{T+\theta}\) |
| C. | \(\chi = \dfrac{C}{\theta-T}\) |
| D. | \(\chi = \dfrac{C}{T\theta}\) |
| Answer» B. \(\chi = \dfrac{C}{T+\theta}\) | |
| 13. |
In ferromagnetic materials, the net magnetic moment created due to magnetization by an applied field is: |
| A. | Normal to applied field |
| B. | Adds to applied field |
| C. | In line Magneto motive force |
| D. | subtracts from applied field |
| Answer» C. In line Magneto motive force | |
| 14. |
At what temperatures domains lose their ferromagnetic properties? |
| A. | Above ferromagnetic Curie temperature |
| B. | Below paramagnetic Curie temperature |
| C. | Above 4° K |
| D. | At room temperature |
| Answer» B. Below paramagnetic Curie temperature | |
| 15. |
In a dielectric, the displacement vector D, the polarisation vector P and the electric field vector E are related by the expression: |
| A. | D - ε0P = ε0E |
| B. | D - E = ε0P |
| C. | D - P = ε0E |
| D. | E - P = ε0D |
| Answer» D. E - P = ε0D | |
| 16. |
Diamagnetic materials are |
| A. | Attracted by Both poles |
| B. | Attracted by North pole |
| C. | Repelled by North pole |
| D. | Repelled by both poles |
| Answer» E. | |
| 17. |
Consider the following statements regarding magnetic materials:1. A diamagnetic material has no permanent dipole2. Paramagnetic material has anti parallel orientation of equal moments with neighbouring dipoles3. Ferrimagentic material has anti parallel orientation of unequal moments between neighbouring diploesWhich of these statements are correct? |
| A. | 1 and 2 |
| B. | 3 and 4 |
| C. | 2 and 4 |
| D. | 1 and 3 |
| Answer» E. | |
| 18. |
A magnetic material has a magnetization of 2350 A/m and produces a flux density of 3.142 mWb/m2. Then, the relative permeability of the material is: |
| A. | 11.67 |
| B. | 17.47 |
| C. | 12.47 |
| D. | 16.67 |
| Answer» E. | |
| 19. |
A bar of diamagnetic material placed in an external magnetic field will ______________________ field. |
| A. | pull in the field lines and move from high to low |
| B. | repel out the field lines and move from low to high |
| C. | pull in the field lines and move from low to high |
| D. | repel out the field lines and move from high to low |
| Answer» E. | |
| 20. |
At which place Earth’s magnetic field becomes horizontal |
| A. | Magnetic meridian |
| B. | Magnetic equator |
| C. | Geographical pole |
| D. | Tropic of cancer |
| Answer» C. Geographical pole | |
| 21. |
Compared to other materials, a material with a wider hysteresis loop has |
| A. | lower permeability, higher retentivity and higher coercivity |
| B. | higher permeability, lower retentivity and higher coercivity |
| C. | lower permeability, higher retentivity and lower reluctance |
| D. | lower permeability, lower retentivity and lower residual magnetism |
| Answer» B. higher permeability, lower retentivity and higher coercivity | |
| 22. |
In a superconducting magnet, wires of superconducting material are embedded in the thick copper matrix, because while the material is in the superconducting state: |
| A. | The leakage current passes through the copper part |
| B. | Copper part helps in conducting heat away from the superconductor |
| C. | Copper part helps in overcoming the mechanical stress |
| D. | Copper acts as an insulating cover for superconductor. |
| Answer» D. Copper acts as an insulating cover for superconductor. | |
| 23. |
An electron moving around the central nucleus has a magnetic moment equal to ___________, where 'l' is the magnitude of the angular momentum of the circulating electron about the central nucleus. ('e' is charge and 'm' is mass of an electron) |
| A. | 2el/m |
| B. | 2m/el |
| C. | el/2m |
| D. | m/2el |
| Answer» D. m/2el | |
| 24. |
A bar of paramagnetic material is placed in a strong external magnetic field. Then, the field inside it is likely to |
| A. | remain the same |
| B. | increase |
| C. | vanish completely |
| D. | decrease |
| Answer» C. vanish completely | |
| 25. |
Hard magnetic materials like tungsten-steel alloy or chromium-steel alloy are used in the manufacture of: |
| A. | dynamo core |
| B. | permanent magnets |
| C. | transformer core |
| D. | electromagnets |
| Answer» C. transformer core | |
| 26. |
A magnetic material when placed in a magnetic field is pulled out of it. The material is: |
| A. | Paramagnetic |
| B. | Diamagnetic |
| C. | Ferromagnetic |
| D. | Antiferromagnetic |
| E. | Ferrites |
| Answer» C. Ferromagnetic | |
| 27. |
A susceptibility of a certain magnetic material is 400. What is the class of the magnetic material? |
| A. | Diamagnetic |
| B. | Paramagnetic |
| C. | Ferromagnetic |
| D. | Ferroelectric |
| Answer» D. Ferroelectric | |
| 28. |
At the center of a bar, magnetism is |
| A. | maximum |
| B. | minimum |
| C. | zero |
| D. | unknown |
| Answer» D. unknown | |
| 29. |
A 1φ , 120 v, 60 Hz supply is connected to the coil of the given circuit. The coil has 200 turns. The parameters of the core are as follows:Length of core = 100 cmCross – sectional area of core = 20 cm2Relative permeability of core = 2500Obtain an expression for the flux density in the core. |
| A. | \(\frac{1}{{8.88}}\sin 2\pi 60\;t\;Tesla\) |
| B. | \(\frac{1}{{0.888}}\sin t\;Tesla\) |
| C. | \(\frac{1}{{0.888}}\sin 2\pi 60\;t\;Tesla\) |
| D. | \(\frac{1}{{0.888}}sin{\rm{ }}2\pi {\rm{ }}t{\rm{ }}Tesla\) |
| Answer» D. \(\frac{1}{{0.888}}sin{\rm{ }}2\pi {\rm{ }}t{\rm{ }}Tesla\) | |
| 30. |
B/μo = M is equal to?(B is magnetic field, M is magnetisation of the material and μo is permeability of free space) |
| A. | magnetic susceptibility |
| B. | magnetic moment |
| C. | magnetic intensity |
| D. | magnetic flux |
| Answer» D. magnetic flux | |
| 31. |
M/H is equal to _____________. ('M' is magnetisation of the material and 'H' is magnetic intensity) |
| A. | magnetic moment |
| B. | relative magnetic permeability |
| C. | magnetic flux |
| D. | magnetic susceptibility |
| Answer» E. | |
| 32. |
For high speed reading and storing of information in a computer, the core shall be of |
| A. | Ferrite |
| B. | Piezoelectric |
| C. | Pyroelectric |
| D. | Ferromagnetic above 768°C |
| Answer» B. Piezoelectric | |
| 33. |
In scintillation coating applications, shields of which material are generally placed around the photomultiplier tube to overcome interference effects of electrons deflected from their normal path? |
| A. | Ferromagnetic |
| B. | Mu-metal magnetic |
| C. | Electromagnetic |
| D. | Dielectric |
| Answer» C. Electromagnetic | |
| 34. |
Consider the following statements:1. Type-I superconductors undergo an abrupt transition to the normal state above a critical magnetic field.2. Type-II superconductors are highly technologically useful superconductors because the incidence of a second critical field in them is useful in the preparation of high field electromagnets.Which of the above statements is/are correct? |
| A. | 1 only |
| B. | 2 only |
| C. | Both 1 and 2 |
| D. | Neither 1 nor 2 |
| Answer» D. Neither 1 nor 2 | |
| 35. |
Gauss’s law for magnetism states that, the net __________________ through any closed surface is zero. |
| A. | magnetic susceptibility |
| B. | magnetic flux |
| C. | relative magnetic permeability |
| D. | magnetic intensity |
| Answer» C. relative magnetic permeability | |