This is the Multiple Choice Questions Part 10 of the Series in Electricity and Magnetism Fundamentals as one of the Electronics Engineering topic. In Preparation for the ECE Board Exam make sure to expose yourself and familiarize in each and every questions compiled here taken from various sources including but not limited to past Board Exam Questions in Electronics Engineering field, Electronics Books, Journals and other Electronics References.
MCQ Topic Outline included in ECE Board Exam Syllabi
- MCQ in Atomic Structure
- MCQ in Electric Charge
- MCQ in Ohm’s Law, Kirchoff Law, Coulomb’s Law, etc
- MCQ in Magnetic Power
- MCQ in Magnetic Field and Magnetic Flux
- MCQ in Magnetic and Electric Quantities / Units
- MCQ in Magnetic/Electromagnet Principles
Continue Practice Exam Test Questions Part 10 of the Series
Choose the letter of the best answer in each questions.
451. What do you call the phenomenon whereby substance attracts pieces of iron?
A. Permeability
B. Magnetism
C. Naturalism
D. Electromagnetism
Answer: Option B
Solution:
452. The condition in which a substance attracts pieces of iron is known as
A. Electromagnetism
B. Electrolysis
C. Magnetism
D. Magnetic Induction
Answer: Option C
Solution:
453. A substance that attracts pieces iron is known as
A. magnet
B. conductor
C. ferrite
D. superconductor
Answer: Option A
Solution:
454. A natural magnet
A. loadstone
B. carbon
C. lodestone
D. magnesium
Answer: Option C
Solution:
455. Group of magnetically aligned atoms.
A. Lattice
B. Crystal
C. Domain
D. Range
Answer: Option C
Solution:
456. In a magnet, what do you call the point in which the magnetic lines of force is maximum?
A. maximum pole
B. intensified pole
C. unit pole
D. magnetic pole
Answer: Option D
Solution:
457. Which of the following refers to a characteristic of a magnetic line of force?
A. Travels from south to north through the surrounding medium of a bar magnet
B. Travels back and forth between the north and south pole of a bar magnet
C. Travels from north to south through the surrounding medium of a bar magnet
D. Stay stationary between the north and the south of a bar magnet
Answer: Option C
Solution:
458. Is believed to be the pole where the magnetic lines of force are originating.
A. North Pole
B. South Pole
C. Unit Pole
D. Universal Pole
Answer: Option A
Solution:
459. What do you call a pole that when place in air with a similar and equal pole will cause a force of repulsion of 1/4πμο Newtons?
A. South Pole
B. Unit pole
C. Convergence pole
D. Universal Pole
Answer: Option B
Solution:
460. In a magnet, the straight line passing through the two poles is called
A. real axis
B. imaginary axis
C. Cartesian axis
D. magnetic axis
Answer: Option D
Solution:
461. The phenomenon in which a substance becomes a magnet when placed near a magnet.
A. magnetic transfer
B. magnetic induction
C. electromagnetism
D. magnetism
Answer: Option B
Solution:
462. A force which causes a substance to become a magnet.
A. magnetizing force
B. magnetomotive
C. creative force
D. electromagnetic force
Answer: Option A
Solution:
463. What do you call the quantity of magnetism retained by a magnetic material after the withdrawal of a magnetizing force?
A. Left over magnetism
B. Coercivity
C. Hysteresis
D. Residual magnetism
Answer: Option D
Solution:
464. Is the property of magnetic materials, which retain magnetism after the withdrawal of magnetizing force.
A. retentivity
B. permeability
C. reluctivity
D. susceptability
Answer: Option A
Solution:
465. A substance having high retentivity is best suited in making
A. an electromagnet
B. a temporary magnet
C. a permanent magnet
D. two pole magnet
Answer: Option C
Solution:
466. Which of the materials below that can be easily magnetized?
A. soft magnetic materials
B. hard magnetic materials
C. low conductive materials
D. high conductive materials
Answer: Option A
Solution:
467. Materials that can be easily magnetized in both directions
A. soft magnetic materials
B. hard magnetic materials
C. diamagnetic
D. paramagnetic
Answer: Option A
Solution:
468. Ability of a material to conduct magnetic flux through it refers to
A. permittivity
B. permeability
C. reluctivity
D. conductivity
Answer: Option B
Solution:
469. The ability to concentrate magnetic lines of force.
A. retentivity
B. permeability
C. susceptability
D. reluctivity
Answer: Option B
Solution:
470. The permeability of free space.
A. 4π x 10^-7 H/m
B. 12.56 x 10^-7 F/m
C. 8.854 x 10^-7 H/m
D. 8.854 x 10^-12 F/m
Answer: Option A
Solution:
471. The ratio of material permeability to the permeability of air or vacuum.
A. relative conductivity
B. relative permeability
C. inverse permeability
D. inverse permittivity
Answer: Option B
Solution:
472. What is the relative permeability of air?
A. 0
B. 1
C. 4π x 10^-7 H/m
D. 8.854 x 10^-12 F/m
Answer: Option B
Solution:
473. Materials with permeability slightly less than that of free space.
A. diamagnetic
B. paramagnetic
C. ferromagnetic
D. antimagnetic
Answer: Option A
Solution:
474. Materials with permeability slightly greater than that of free space.
A. diamagnetic
B. paramagnetic
C. ferromagnetic
D. antimagnetic
Answer: Option B
Solution:
475. What do you call materials, which possess very high permeabilities?
A. diamagnetic
B. paramagnetic
C. ferromagnetic
D. antimagnetic
Answer: Option C
Solution:
476. What is the relative permeability of paramagnetic substance?
A. slightly greater than 1
B. very much greater than 1
C. slightly less than 1
D. very much smaller than 1
Answer: Option A
Solution:
477. Permeability of a material means:
A. The ability of the material to conduct electric field
B. The conductivity of the material for electromagnetic field
C. The ability of the material to hold magnetic flux
D. The conductivity of the material for magnetic lines of force
Answer: Option D
Solution:
478. Nonmetallic materials that has ferromagnetic properties.
A. termites
B. ferrites
C. ferrous
D. loadstone
Answer: Option B
Solution:
479. Cores of magnetic equipment use magnetic material which has
A. very low permeability
B. moderate permeability
C. low permeability
D. high permeability
Answer: Option D
Solution:
480. Hydrogen is an example of a _________ material.
A. diamagnetic
B. ferromagnetic
C. paramagnetic
D. magnetic
Answer: Option A
Solution:
481. Cobalt is an example of a _________ material.
A. diamagnetic
B. ferromagnetic
C. paramagnetic
D. magnetic
Answer: Option B
Solution:
482. The space outside a magnet where its poles has a force of attraction or repulsion on another magnetic pole.
A. magnetic field
B. magnetic flux
C. magnetic flux density
D. magnetic lines of force
Answer: Option A
Solution:
483. The imaginary lines representing the magnetic field.
A. magnetic field
B. magnetic flux
C. magnetic flux density
D. magnetic lines of force
Answer: Option D
Solution:
484. What do you call the total number of magnetic lines of force in a magnetic field?
A. magnetic field
B. magnetic flux
C. magnetic flux density
D. magnetic lines of force
Answer: Option B
Solution:
485. The number of lines per unit area in a plane perpendicular to the magnetic lines of force.
A. magnetic field
B. magnetic flux
C. magnetic flux density
D. magnetic lines of force
Answer: Option C
Solution:
486. The direction of field lines outside a magnet is
A. from north to south pole
B. from south to north pole
C. either from north to south or south to north pole
D. dependent on the magnet’s orientation with respect to the earth’s magnetic pole
Answer: Option C
Solution:
487. The entire group of magnetic field lines flowing outward from the north pole of a magnet.
A. magnetic field
B. magnetic flux density
C. magnetic flux
D. electromagnetic field
Answer: Option C
Solution:
488. Magnetic lines of force are called
A. magnetic field
B. magnetic flux density
C. magnetic flux
D. electromagnetic field
Answer: Option C
Solution:
489. What is the unit of magnetic flux in SI system?
A. Weber
B. Maxwell
C. Tesla
D. Gauss
Answer: Option A
Solution:
490. The unit of magnetic flux density in SI:
A. Gauss
B. Weber
C. Maxwell
D. Tesla
Answer: Option D
Solution:
491. A magnetic flux of 25,000 Maxwell in an area of 5 sq. cm. results in flux density of
A. 5,000 Gauss (G)
B. 125,000 G
C. 5,000 Tesla (T)
D. 125,000 T
Answer: Option A
Solution:
492. Calculate the flux density in Gauss (G) having a flux of 12,000 Mx through a perpendicular area of 6cm.
A. 200 G
B. 2,000 G
C. 7,200 G
D. 72,000 G
Answer: Option B
Solution:
493. What does a gauss meter measure?
A. flux
B. magnetic field
C. magnetic flux density
D. mmf
Answer: Option C
Solution:
494. The capacity of a substance to become magnetized. This is expressed as a ratio between the magnetization produced in a substance to the magnetizing force producing it.
A. magnetic conductivity
B. magnetic susceptibility
C. magnetic resistivity
D. magnetic reluctivity
Answer: Option B
Solution:
495. The typical saturation flux density for most magnetic materials.
A. 0.1 Wb/m^2
B. 2 Wb/m^2
C. 10 Wb/m^2
D. 20 Wb/m^2
Answer: Option B
Solution:
496. The force between two magnetic poles is _________ permeability of the medium.
A. directly proportional to the
B. inversely proportional to the
C. not dependent of the
D. exponentially proportional to the
Answer: Option B
Solution:
497. If the distance between two magnetic poles is halve, the force between them
A. decreases two times
B. decreases four times
C. increases two times
D. increases four times
Answer: Option D
Solution:
498. A force of 20 N is acting on a 10 Wb magnetic pole, calculate the intensity of the magnetic field?
A. 0.5 N/Wb
B. 2 N/Wb
C. 10 N/Wb
D. 20 N/Wb
Answer: Option B
Solution:
499. Unit of permeability
A. Henry/meter (H/m)
B. Farad/meter (F/m)
C. Henry-meter (H-m)
D. Farad-meter (F-m)
Answer: Option A
Solution:
500. The unit of permittivity
A. Henry/meter (H/m)
B. Farad/meter (F/m)
C. Henry-meter (H-m)
D. Farad-meter (F-m)
Answer: Option B
Solution:
