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Magnetism

53 MCQ questions with answers and explanations · page 2 of 3

Test yourself▶ 25 question test▶ 50 question test

Q26. The angle which a magnetic needle freely suspended at its centre of gravity makes with the horizontal is called-

  1. Abowing angle
  2. Bsubluxation angle
  3. CHorizontal angle
  4. DNone of these
Show answer & explanation

Answer: A) bowing angle

Q27. A magnetic substance can be demagnetized by-

  1. Aby hammering
  2. Bheat up
  3. Cboth of the above
  4. Dnone of these
Show answer & explanation

Answer: C) both of the above

Q28. The magnetic effect of electric current was first observed in-

  1. Aby Henry
  2. Bby Ostend
  3. Cby Faraday
  4. DBy Volta
Show answer & explanation

Answer: B) by Ostend

Q29. What is the value of angle of dip at the poles?

  1. A0°
  2. B45°
  3. C60°
  4. D90°
Show answer & explanation

Answer: D) 90°

Q30. The axis of a freely hanging magnetic needle makes an angle with the geographical axis-

  1. Aof 20°
  2. Bof 16°
  3. Cof 18°
  4. Dof 15°
Show answer & explanation

Answer: C) of 18°

Q31. A stationary magnet always shows-

  1. ANorth-North and South-South
  2. BNorth-South and South-North
  3. CEast-East and West-West
  4. Dnone of these
Show answer & explanation

Answer: A) North-North and South-South

Q32. The ratio of flux density and magnetic field strength in a medium is-

  1. Amagnetization density
  2. Breceptivity
  3. Crelative prevalence
  4. Dpermeability
Show answer & explanation

Answer: D) permeability

Q33. The process by which a metal is made non-magnetic is called-

  1. ADemagnetization
  2. BDegaising
  3. CDigeding
  4. DDegreasing
Show answer & explanation

Answer: A) Demagnetization

Q34. Which finger shows the direction of current in Fleming's left hand rule?

  1. Aindex finger
  2. Bmiddle finger
  3. CThumb
  4. Dring finger
Show answer & explanation

Answer: B) middle finger

Q35. Fleming's left hand rule gives the direction of

  1. AElectric current in a conductor placed in an electric field.
  2. Bmagnetic field in an electric conductor
  3. CThe direction of force in an electric conductor when the conductor is in a magnetic field
  4. Dnone of these
Show answer & explanation

Answer: C) The direction of force in an electric conductor when the conductor is in a magnetic field

Q36. Which of the following statements is false?

  1. AThere is a magnetic field around a magnet
  2. BOstand is credited with the discovery of electromagnetic field.
  3. CIf the compass needle is kept near a magnet, it does not stop in the north-south direction but gets arranged in a particular direction.
  4. DA magnetic field is not produced around an electric current.
Show answer & explanation

Answer: D) A magnetic field is not produced around an electric current.

Q37. The laws of electromagnetic induction have been used to make which of the following?

  1. Acurrent meter
  2. BVolt Meter
  3. Celectric motor
  4. Dgenerator
Show answer & explanation

Answer: D) generator

Q38. The working principle of 'dynamo' is related to which of the following?

  1. AIt converts attention energy into mechanical energy.
  2. BIt converts electrical energy into mechanical energy
  3. CIt converts electrical energy into sound energy
  4. DIt converts mechanical energy into electrical energy
Show answer & explanation

Answer: D) It converts mechanical energy into electrical energy

Q39. The working principle of Dyneema (electric generator) is-

  1. Athermoelectric effect
  2. Belectromagnetic effect
  3. Cmagnetic effect of current
  4. DEnergy conservation
Show answer & explanation

Answer: B) electromagnetic effect

Q40. The electric motor works according to the following principle:

  1. AFaraday's laws
  2. BLenz's law
  3. COhm's law
  4. DFleming's Law
Show answer & explanation

Answer: A) Faraday's laws

Q41. Which of the following materials is most suitable for making the core of a transformer?

  1. Asoft iron
  2. Bstainless steel
  3. CCopper
  4. DNickel
Show answer & explanation

Answer: A) soft iron

Q42. The principle of transformer is based on-

  1. Aon the principle of magnetic induction
  2. Bon the principle of electromagnetic induction
  3. Con the principle of self-induction
  4. Don the principle of mutual induction
Show answer & explanation

Answer: B) on the principle of electromagnetic induction

Q43. What is a transformer?

  1. AConverts DC to AC.
  2. BUsed to increase or decrease AC voltage
  3. Cconverts AC voltage to DC voltage
  4. Dconverts electrical energy into mechanical energy
Show answer & explanation

Answer: B) Used to increase or decrease AC voltage

Q44. Lenz's law is-

  1. Aconservation of mass
  2. Bconservation of momentum
  3. Cenergy conservation
  4. Dconservation of mass and energy
Show answer & explanation

Answer: C) energy conservation

Q45. If a magnet has a third pole, then the third pole is called—

  1. AAdditional pole
  2. BRandom poles
  3. CFaulty pole
  4. Dresultant pole
Show answer & explanation

Answer: D) resultant pole

Q46. The Earth is a huge magnet. In which direction does its magnetic field extend?

  1. AEast to west
  2. BWest to East
  3. CNorth South
  4. DSouth to North
Show answer & explanation

Answer: D) South to North

Q47. The Curie temperature of iron is-

  1. A450°C
  2. B575°C
  3. C635°C
  4. D780°C
Show answer & explanation

Answer: D) 780°C

Q48. Magnets are an essential part of which of the following household appliances?

  1. Acalling bell
  2. Bfan
  3. Cwashing machine
  4. DAll of the above
Show answer & explanation

Answer: D) All of the above

Q49. The value of the angle of dip at the equator is-

  1. A0°
  2. B90°
  3. C180°
  4. D45°
Show answer & explanation

Answer: A) 0°

Q50. The lines of force in a uniform magnetic field should be-

  1. Aconvergent
  2. Bdivergent
  3. Cparallel to each other
  4. Dintersection
Show answer & explanation

Answer: C) parallel to each other

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