MCQOPTIONS
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MCQOPTIONS
This section includes 17 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 an electric field 'E' directed upwards, an electron of charge 'e' will experience a ________________. |
| A. | downward force of magnitude eE |
| B. | upward force of magnitude eE |
| C. | downward force of magnitude e / E |
| D. | upward force of magnitude e / E |
| Answer» B. upward force of magnitude eE | |
| 2. |
Electrostatic field at a distance r from midpoint of a dipole is proportional to? |
| A. | 1/r2 |
| B. | 1/r |
| C. | 1/r3 |
| D. | r |
| Answer» D. r | |
| 3. |
A charged particle of charge q and mass m is released from rest in a uniform electric field E. Neglecting the effect of gravity, the kinetic energy of the charged particle after time t seconds is |
| A. | \(\frac{{Eqm}}{t}\) |
| B. | \(\frac{{{E^2}{q^2}{t^2}}}{{2m}}\) |
| C. | \(\frac{{2{E^2}{t^2}}}{{qm}}\) |
| D. | \(\frac{{E{q^2}m}}{{2{t^2}}}\) |
| Answer» C. \(\frac{{2{E^2}{t^2}}}{{qm}}\) | |
| 4. |
If 5.0 μC charge is placed at the center of a Gaussian surface in the form of a cube. The electric flux through any one face of the cube is: |
| A. | 5.6 × 105 N m2/C |
| B. | 1.4 × 105 N m2/C |
| C. | 9.4 × 104 N m2/C |
| D. | 1.9 × 104 N m2/C |
| Answer» D. 1.9 × 104 N m2/C | |
| 5. |
If 'φ' is Electric flux through a closed surface 'S', 'q' is total charge enclosed by 'S' and єo is the permittivity of free space, then these three are related by Gauss' Law formula __________. |
| A. | φ = qєo |
| B. | φ = q/єo |
| C. | φ = єo/q |
| D. | φ = √(qєo) |
| Answer» C. φ = єo/q | |
| 6. |
Number of electric lines of force passing through unit area is called |
| A. | electric flux |
| B. | density |
| C. | electric field |
| D. | None of these |
| Answer» B. density | |
| 7. |
According to Gauss’s law, the electric field due to an infinitely long thin charged wire varies as: |
| A. | 1/r |
| B. | 1/r2 |
| C. | r |
| D. | r2 |
| Answer» B. 1/r2 | |
| 8. |
In a dielectric medium, the dielectric polarization P, electric displacement D and electric field E are related as: |
| A. | E = D - ε0P |
| B. | P = ε0E + D |
| C. | D = ε0E + P |
| D. | D = P - ε0E |
| Answer» D. D = P - ε0E | |
| 9. |
Electric field intensity at the centre of uniformly charge distributed hemisphere is |
| A. | \(\dfrac{\sigma}{4\varepsilon_0}\) |
| B. | \(\dfrac{2\sigma}{\varepsilon_0}\) |
| C. | \(\dfrac{\sigma}{2\varepsilon_0}\) |
| D. | \(\dfrac{\sigma}{\varepsilon_0}\) |
| Answer» B. \(\dfrac{2\sigma}{\varepsilon_0}\) | |
| 10. |
In an electric field E directed downwards a proton of charge e will experience a _________. |
| A. | upward force of magnitude eE |
| B. | downward force of magnitude e/E |
| C. | upward force of magnitude e/E |
| D. | downward force of magnitude eE |
| Answer» E. | |
| 11. |
Electric flux through a closed surface 'S' enclosing a charge 'q' is equal to ______________. (єo is permittivity of free space) |
| A. | qєo |
| B. | q2єo |
| C. | єo/q |
| D. | q/єo |
| Answer» E. | |
| 12. |
In a Van de Graaff Generator the inner sphere has higher _____________ than the outer sphere. |
| A. | potential |
| B. | charge |
| C. | capacitance |
| D. | current |
| Answer» B. charge | |
| 13. |
In a dielectric material, the polarisation vector P, the displacement vector D and the electric field vector E are related as |
| A. | ϵ0E = D + P |
| B. | P = E - ϵ0D |
| C. | P = ϵ0E + D |
| D. | P = D - ϵ0E |
| Answer» E. | |
| 14. |
If a dipole of dipole moment 'p' is kept in a uniform electric field 'E' then the cross product (p x E) is equal to _______________ the dipole. |
| A. | angular momentum of |
| B. | torque on |
| C. | angular acceleration of |
| D. | force on |
| Answer» C. angular acceleration of | |
| 15. |
A metallic sphere is placed in a uniform electric field. The lines of force follow the paths as shown in figure. Identify the correct path of lines of force. |
| A. | I |
| B. | II |
| C. | III |
| D. | IV |
| Answer» E. | |
| 16. |
Due to an electric field 'E' directed upwards an electron of charge 'e' and mass 'm' will have an acceleration _______________. |
| A. | eE/m upwards |
| B. | e/(Em) downwards |
| C. | e/(Em) upwards |
| D. | eE/m downwards |
| Answer» E. | |
| 17. |
If a charge q is placed at one corner of cube, the flux through the cube is |
| A. | \(\dfrac{q}{\varepsilon_0}\) |
| B. | \(\dfrac{q}{4\varepsilon_0}\) |
| C. | \(\dfrac{q}{8\varepsilon_0}\) |
| D. | zero |
| Answer» B. \(\dfrac{q}{4\varepsilon_0}\) | |