MCQOPTIONS
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MCQOPTIONS
This section includes 25 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 charge at rest produces: |
| A. | Magnetic field only |
| B. | Electric field only |
| C. | Both electric field and magnetic field |
| D. | Neither electric field nor magnetic field |
| Answer» C. Both electric field and magnetic field | |
| 2. |
An electromagnet is |
| A. | a temporary magnet |
| B. | a permanent magnet |
| C. | not a strong magnet |
| D. | neither temporary nor permanent magnet |
| Answer» B. a permanent magnet | |
| 3. |
A square loop of side l is carrying current I, as shown. Find the magnetic field induction at the centre of the loop. |
| A. | \(\frac{{{\mu _0}i}}{{2\pi l}}\) |
| B. | \(8\sqrt 2 \frac{{{\mu _0}i}}{{4\pi l}}\) |
| C. | \(\sqrt 2 \frac{{{\mu _0}i}}{{\pi l}}\) |
| D. | Zero |
| Answer» C. \(\sqrt 2 \frac{{{\mu _0}i}}{{\pi l}}\) | |
| 4. |
A straight conducting wire carries a DC current through it. Which one of the following statements is true regarding the magnetic field around the wire? |
| A. | The magnetic field does not depend upon the amount of current flowing through the wire |
| B. | The magnetic field does not depend upon the distance from the wire |
| C. | The magnetic field depends upon the material of the wire |
| D. | The magnetic decreases with an increase of distance from the wire |
| Answer» E. | |
| 5. |
Consider a long solenoid of 'n' turns per unit length and carrying a current 'I'. The magnetic field in the interior of the solenoid was shown to be givenby Bo= ___________. |
| A. | μonI2 |
| B. | nI/μo |
| C. | μonI |
| D. | nI2/μo |
| Answer» D. nI2/μo | |
| 6. |
A positively charged particle projected towards east is deflected towards north by a magnetic field. The field may be: |
| A. | Upward |
| B. | Towards west |
| C. | Downward |
| D. | Towards south |
| Answer» D. Towards south | |
| 7. |
For a current carrying conductor, in the Maxwell's 'Right hand thumb law' the thumb points towards the |
| A. | direction of magnetic field |
| B. | direction of electric current |
| C. | direction of earth's magnetic field |
| D. | none of these |
| Answer» C. direction of earth's magnetic field | |
| 8. |
A galvanometer can be converted into at ammeter by connecting |
| A. | A low resistance in series |
| B. | A low resistance in parallel |
| C. | A high resistance in series |
| D. | A high resistance in parallel |
| Answer» C. A high resistance in series | |
| 9. |
Magnetism at the center of a bar magnet is ______? |
| A. | Half of the poles |
| B. | Maximum |
| C. | Minimum |
| D. | Zero |
| Answer» E. | |
| 10. |
A metal when brought near the end of a strong magnet, it gets repelled. This metal is: |
| A. | Non-magnetic |
| B. | Ferromagnetic |
| C. | Diamagnetic |
| D. | Paramagnetic |
| Answer» D. Paramagnetic | |
| 11. |
Consider the following statements about a solenoid:1. The magnetic field strength in a solenoid depends upon the number of turns per unit length in the solenoid2. The magnetic field strength in a solenoid depends upon the current flowing in the wire of the solenoid3. The magnetic field strength in a solenoid depends upon the diameter of the solenoidWhich of the statements given above are correct? |
| A. | 1, 2 and 3 |
| B. | 1 and 3 only |
| C. | 2 and 3 only |
| D. | 1 and 2 only |
| Answer» E. | |
| 12. |
If the interior of the solenoid is filled with a material with non-zero magnetisation the net field in the interior of the solenoid may be expressed as B = _____________. |
| A. | (Bo + Bm) / 2 |
| B. | \(\sqrt {(B_o + B_m)}\) |
| C. | Bo + Bm |
| D. | \(\sqrt {[(B_o + B_m)/2]}\) |
| Answer» D. \(\sqrt {[(B_o + B_m)/2]}\) | |
| 13. |
Consider a circular loop of wire lying on the plane of a table. Let an electric current pass through the loop clockwise. The direction of the magnetic field inside is: |
| A. | perpendicular to the plane of the table pointing into it |
| B. | always along the tangent to the loop in the same sense of flow of the current |
| C. | perpendicular to the plane of the table and appearing to emerge out from it |
| D. | always along the tangent to the loop opposite to the sense of flow of the current |
| Answer» B. always along the tangent to the loop in the same sense of flow of the current | |
| 14. |
A circular coil of radius R having N number of turns carries a steady current I. The magnetic induction at the centre of the coil is 0.1 tesla. If the number of turns is doubled and the radius is halved, which one of the following will be the correct value for the magnetic induction at the centre of the coil? |
| A. | 0.05 tesla |
| B. | 0.2 tesla |
| C. | 0.4 tesla |
| D. | 0.8 tesla |
| Answer» D. 0.8 tesla | |
| 15. |
Charge on an electron is |
| A. | + 1.6 × 10-19 Coulomb |
| B. | - 1.6 × 10-19 Coulomb |
| C. | + 1.9 × 10-16 Coulomb |
| D. | - 1.9 × 19-16 Coulomb |
| Answer» B. - 1.6 × 10-19 Coulomb | |
| 16. |
Consider the following image:A proton enters a magnetic field at right angles to it, as shown above. The direction of force acting on the proton will be |
| A. | to the right |
| B. | to the left |
| C. | out of the page |
| D. | into the page |
| Answer» E. | |
| 17. |
In a uniform magnetic field 'B,' a charge 'q' executes a/an __________ orbit in a plane normal to 'B'. |
| A. | elliptical |
| B. | parabolic |
| C. | hyperbolic |
| D. | circular |
| Answer» E. | |
| 18. |
A cylotron is not used to produce high energy electrons because electrons |
| A. | cannot be inserted between the Dees |
| B. | have smaller mass |
| C. | reach relativistic speeds very quickly |
| D. | radiate sufficiently large energy |
| Answer» C. reach relativistic speeds very quickly | |
| 19. |
A rectangular loop of sides 15 cm and 10 cm. carrying a current of 1 A, is placed with its longer side parallel to long straight wire carrying a current of 2 A placed at distance of 2 cm. The net force experience by the loop is: |
| A. | 25 × 10-7 N towards the longer side |
| B. | 25 × 10-7 N away from the longer side |
| C. | 30 × 10-7 N towards the longer side |
| D. | 30 × 10-7 N away from the longer side |
| Answer» B. 25 × 10-7 N away from the longer side | |
| 20. |
A current through a horizontal power line flows in east to west direction. The direction of magnetic field at a point directly below it is |
| A. | south to north |
| B. | north to south |
| C. | west to east |
| D. | east to west |
| Answer» C. west to east | |
| 21. |
Magnetic force on a conductor of length 'L' and carrying a current 'I' kept in an external magnetic field 'B' is equal to? |
| A. | BIL |
| B. | B2I/ L |
| C. | I2L/B |
| D. | IL2/B |
| Answer» B. B2I/ L | |
| 22. |
In a solenoid, the current flowing through the wire is I and number of turns per unit length is n. This gives a magnetic field B inside the solenoid. If number of turn per unit length is increased to 2n, what will be the value of magnetic field in the solenoid? |
| A. | B |
| B. | 2B |
| C. | B / 2 |
| D. | B / 4 |
| Answer» C. B / 2 | |
| 23. |
At the centre of a current carrying single turn circular loop, the magnetic field is |
| A. | \(\bar B = \frac{I}{{2\pi \mu_0 R}}\) |
| B. | \(B = \;\frac{{{\mu _0{}}I}}{{2R}}\) |
| C. | \(B = \;\frac{{{\mu _0{}}I}}{{2\pi R}}\) |
| D. | \(\bar B = \frac{{\mu_0 I}}{{2\pi {R^2}}}\) |
| Answer» C. \(B = \;\frac{{{\mu _0{}}I}}{{2\pi R}}\) | |
| 24. |
A wire of length L is bent in the form a circular loop. And current is passed through the loop. The magnetic field induction at the centre of the loop is B. Find the current passing through the loop. |
| A. | \(\frac{{B\pi L}}{{{\mu _0}}}\) |
| B. | \(\frac{{BL}}{{{\mu _0}\pi }}\) |
| C. | \(\frac{{B\pi }}{{L{\mu _0}}}\) |
| D. | \(\frac{{BL}}{\pi }\) |
| Answer» C. \(\frac{{B\pi }}{{L{\mu _0}}}\) | |
| 25. |
Magnetic field lines being more crowded towards the pole of a magnet indicates that the magnetic field due to the magnet in that region is |
| A. | the weakest |
| B. | the outcome of a property of a ferromagnetic substance |
| C. | aligned with the magnetic field of earth |
| D. | the strongest |
| Answer» E. | |