MCQOPTIONS
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MCQOPTIONS
This section includes 12 Mcqs, each offering curated multiple-choice questions to sharpen your Physics knowledge and support exam preparation. Choose a topic below to get started.
| 1. |
In p type semi-conductor material, holes are |
| A. | minority charge carriers |
| B. | donor atoms |
| C. | majority charge carriers |
| D. | acceptor atom |
| Answer» D. acceptor atom | |
| 2. |
A sinusoidal voltage is applied to a series circuit containing a resistor of 25 Ω, a capacitor of 0.90 μF and an inductor of 100 mH. The frequency of the source can be varied. The frequency of the source that will create a resonance condition in the circuit is: |
| A. | 14.7 Hz |
| B. | 25.9 Hz |
| C. | 46.3 Hz |
| D. | 530.1 Hz |
| Answer» E. | |
| 3. |
If two-point charges 'q1,' 'q2' are separated by a distance 'r' in a vacuum, the magnitude of the force (F) between them is given by F = q1q2 / (4πεor2). Here where εo = _________ × 10-12 C2N-1m2. |
| A. | 1.67 |
| B. | 9.11 |
| C. | 8.85 |
| D. | 5.32 |
| Answer» D. 5.32 | |
| 4. |
Conventionally, the charge acquired by glass when rubbed with silk is considered to be_________. |
| A. | positive |
| B. | negative |
| C. | neutral |
| D. | either positive or negative |
| Answer» B. negative | |
| 5. |
A 60 W light bulb has a current of 0.5 A flowing through it. Calculate the number of electrons passing through a cross-section of the filament. |
| A. | ≈ 3.1 × 10-18 electrons / min |
| B. | ≈ 3.1 × 1018 electrons / s |
| C. | ≈ 3.1 × 10-18 electrons / s |
| D. | ≈ 3.1 × 1018 electrons / min |
| Answer» C. ≈ 3.1 × 10-18 electrons / s | |
| 6. |
By convention, the charge on a glass rod that has been rubbed with silk is |
| A. | positive |
| B. | negative |
| C. | either positive or negative |
| D. | None of the above |
| Answer» B. negative | |
| 7. |
For a dynamically stable orbit of radius 'r' in a hydrogen atom, the centripetal force for rotation is provided by the electrostatic force of attraction between the proton and the electron which is equal to _____________.('e' is charge on an electron) |
| A. | e/(4πεor2) |
| B. | e2/(4πεor) |
| C. | e2/(4πεor2) |
| D. | e/(4πεor) |
| Answer» D. e/(4πεor) | |
| 8. |
Lightening conductors are used to protect building from lightning strikes. Which of the following statements is/are true about lightening conductors?1) Lightening conductors create an electric field at its top that lightning strikes it preferentially2) Lightning conductors reduce the effect of the strike by uniformly distributing the charge (current) over the surface of the building3) Lightning conductors take all the charge (current) to deep down in the earth4) Lightning conductors must be installed at a place taller than the buildingSelect the correct answer using the code given below |
| A. | 1 and 2 |
| B. | 3 and 4 only |
| C. | 1, 3 and 4 |
| D. | 4 only |
| Answer» C. 1, 3 and 4 | |
| 9. |
Electroscope was invented by |
| A. | William Gilbert |
| B. | Benjamin Franklin |
| C. | Sir Isaac Newton |
| D. | None of them |
| Answer» B. Benjamin Franklin | |
| 10. |
An accelerated electric charge produces: |
| A. | neither an electric field nor the magnetic field |
| B. | magnetic field only |
| C. | electric field only |
| D. | both electric and magnetic fields |
| Answer» E. | |
| 11. |
Above the critical magnetic field, a superconductor will become |
| A. | a semiconductor |
| B. | an insulator |
| C. | a normal material |
| D. | a magnetic material. |
| Answer» D. a magnetic material. | |
| 12. |
Among the following, which material is a good conductor of electricity? |
| A. | Silver |
| B. | Glass |
| C. | Porcelain |
| D. | Rubber |
| Answer» B. Glass | |