Physics GK 22 - Magnetism

1. Which of the following is correct about magnetic field?
[A] Magnetic field has magnitude but no direction
[B] Magnetic field has both magnitude and direction
[C] Magnetic field may or may not have direction
[D] None of the above

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2. Which is the direction of magnetic field inside a magnet?
[A] from south pole to north pole
[B] from north pole to south pole
[C] from north pole till centre of the magnet
[D] None of the above

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3. Which of the following is correct about magnetic field lines?
[A] Magnetic field lines are closed curves
[B] Degree of closeness of the field lines shows the strength of the magnetic field
[C] Both a and b
[D] None of the above

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4. What is the relationship between the magnetic field in the straight conductor and the distance from it?
[A] magnetic field decreases as the distance increases
[B] magnetic field increases as the distance increases
[C] magnetic field is independent of the distance
[D] None of the above

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5. What is the direction of force as per Fleming’s left hand rule?
[A] parallel to the direction of magnetic field and perpendicular to the direction of current
[B] parallel to the direction of magnetic field and current
[C] perpendicular to the direction of magnetic field and current
[D] perpendicular to the direction of magnetic field and at 45° to the direction of current

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6. Which of the following is correct about an electric motor?
[A] It converts potential energy to chemical energy
[B] It converts electrical energy to mechanical energy
[C] It converts mechanical energy to electrical energy
[D] None of the above

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7. Which of the following phenomenon is the basis of an electric generator?
[A] Electromagnetic Induction
[B] Ferroelectric effect
[C] Telluric currents
[D] Electroluminescence

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8. What is the net magnetic field in a solenoid?
[A] product of the fields due to all the turns
[B] equal to the field due to the largest turn
[C] vector sum of the fields due to all the turns
[D] arithmetic mean of the fields due to all the turns

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9. What is the SI unit of magnetic flux?
[A] teslas
[B] maxwell
[C] weber
[D] Newton

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10. Which of the following is correct about Permeability of free space?
[A] It is a scalar quantity
[B] Its S.I unit is T m A-1
[C] Both a and b
[D] None of the above

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