12th Class Physics MCQs Preparation 2022 and Onwards (Unit:  Electromagnetism: Set-1 (30 MCQs)) for National MDCAT, ECAT, FPSC, PPSC, JOB Exam, Physics Lecturer, SSC, HSSC (F.Sc.), BS, MS Exams NTS, ETS, etc..


1. Maximum force that acts on a current-carrying conductor placed in a magnetic field, when the angle between the field and the length of the conductor is




... Answer is C. 90°
Fₘ = kIlB sine θ and sin 90° = 1


2. Tesla in terms of base units is equal to




... Answer is D. kg s⁻² A⁻¹
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3. One Gauss is equal to




... Answer is C. 10⁻⁴ T
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4. The unit of magnetic flux is




... Answer is B. Weber
{1 Wb(Weber) = V s = kg m² s⁻² A⁻¹ }{1 T(Tesla) = N m⁻¹ A⁻¹ = kg m s⁻² A⁻¹ }{1 H(Henry) = Wb A⁻¹ = V s A⁻¹ = kg m² s⁻² A⁻²}


5.  The magnetic flux is maximum when the angle between the magnetic field and vector area is




... Answer is A. 0°
`\Ñ„_b` = BA cos θ and cos 0° = 1


6. Magnetic flux density is defined in terms of




... Answer is D. All of them
1 T = wb m⁻² = N m⁻¹ A⁻¹ = kg m s⁻² A⁻¹


7. A charged particle is moving along X-axis in a magnetic field along the Y-axis. The direction of the magnetic force acting on it is :
     



... Answer is C. along z-axis
Fleming left-hand rule

8. Ampere's Law gives us the relationship between




... Answer is D. Current and magnetic field
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9. The value of permeability of free space is




... Answer is C. 4Ï€ ｘ10⁻⁷ T m A⁻¹
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10. The magnetic field due to a current-carrying solenoid that has 'n' number of turns per unit length is




... Answer is A. A = μ₀ n `\I`
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11. The magnetic field inside the solenoid is independent of one of the following quantities




... Answer is C. Position vector
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12. What is the magnetic force on a stationary charged particle in a uniform magnetic field?




... Answer is A. Zero
F = q(vｘB), when v = 0 m/s thus F = 0


13. An electron is moving horizontally towards the east. If it enters in a magnetic field directed upward then the electron will be deflected in the direction of

... Answer is C. North
As the magnetic force is acting in an upwards direction so the electron will be deflected in an upward direction.


14.  When the direction of motion of a charged particle is perpendicular to the direction of the magnetic field, then the particle follows the path of a




... Answer is D. circle
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15. The torque due to a current-carrying rectangular coil placed in a uniform magnetic field is




... Answer is D. T = NAIB sin θ
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16.. The working principle of a galvanometer is based upon




... Answer is B. Torque
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17. The current passing through the coil of a galvanometer is directly proportional to the :




... Answer is C. Angle of deflection
I ∝ θ


18. A shunted galvanometer is called




... Answer is B. Ammeter
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19. A galvanometer can be converted into a voltmeter by connecting it with




... Answer is D. High resistance in series
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20. Which one of the following quantities is not measured by Avometer




... Answer is A. Charge


21. The torque in the coil can be increased by increasing




... Answer is D. All of these
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22. The resistance of the ideal voltmeter is




... Answer is D. Infinite
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23. To measure the voltage the voltmeter is connected to the circuit in




... Answer is B. Parallel
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24. When a small resistance is connected parallel to a galvanometer, the resulting circuit behaves as




... Answer is B. Ammeter
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25.  The pole pieces of the magnet in a galvanometer are made concave to make the field




... Answer is D. Both A and B
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26. The Earth's northern magnetic pole acts like this:




    ... Answer is B. the south pole of a magnet
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    27. Work done on a charged particle moving in a uniform magnetic field is :




    ... Answer is D. zero
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    28. If the charge is at rest in a magnetic field, then the force on the charge is :




    ... Answer is D. zero
    F = q(vｘB), when v = 0 m/s thus F = 0


    29. Ampere's law is applied to any




... Answer is D. closed path
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30. Magnetic flux will be maximum if the angle between magnetic field strength and vector area is




... Answer is A. 0°
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