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General Science Quiz: Electricity and Magnetism

  • 12 questions
  • 12 minutes
  • Difficulty: Medium
Useful for:SSCSSC CGLSSC CHSLSSC MTSRRB Group DRRB ALPRRB JEState ExamsNDA
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About this quiz

This General Science quiz on Electricity and Magnetism puts 12 multiple-choice questions to you, the verified MCQs published with GK24's note on the topic, 5 of them asked in real previous-year papers. Every question carries a full explanation of why the correct option is right and why the other options are wrong, so you learn the fact behind the answer rather than the letter. Attempt it right after reading the note, keep to the timer, and use the explanations at the end to mark what needs another look. Sit it again before the exam as a quick revision of the topic.

Questions in this quiz

12 questions with answers and explanations

Q1.General ScienceAsked in: RRB JE · 27 May 2019, Shift 1Easy

If the potential difference across the ends of a conductor is halved, what happens to the current flowing through it?

  1. A.It gets increased
  2. B.It gets doubled
  3. C.It gets decreased
  4. D.It gets halved
Show answer
Correct answer: D. It gets halved

By Ohm's law, at a constant temperature the current through a conductor is directly proportional to the potential difference across its ends, since the current equals the potential difference divided by the resistance.

Q2.General ScienceAsked in: RRB JE · 01 Sep 2019, Shift 2Easy

What is the work done to move a unit charge from one point to another in an electric circuit carrying some current, between those two points?

  1. A.Pressure distance
  2. B.Potential difference
  3. C.Potential distance
  4. D.Pressure difference
Show answer
Correct answer: B. Potential difference

The potential difference between two points in a circuit is defined as the work done in moving a unit positive charge from one point to the other.

Q3.General ScienceAsked in: RRB Group D · 10 Oct 2018, Shift 2Medium

Which of the following is NOT based on the heating effect of current?

  1. A.Electric heater
  2. B.Electric bulb (with filament)
  3. C.Electric iron
  4. D.Microwave
Show answer
Correct answer: D. Microwave

A microwave oven does not cook by passing a current through a resistance. It generates microwaves in a magnetron, and these waves make the water molecules in the food rotate rapidly, so the food heats from within by dielectric heating.

Q6.General ScienceMedium

The direction of the magnetic field produced around a straight current-carrying conductor is given by

  1. A.Fleming's left hand rule
  2. B.the right hand thumb rule
  3. C.Fleming's right hand rule
  4. D.Lenz's law
Show answer
Correct answer: B. the right hand thumb rule

Hold the conductor in your right hand with the thumb stretched along the direction of the conventional current; the way your fingers curl round the wire is the direction of the concentric magnetic field lines.

Q7.General ScienceMedium

Fleming's left hand rule is used to find the direction of

  1. A.the induced current in a generator
  2. B.the force on a current-carrying conductor in a magnetic field
  3. C.the magnetic field around a solenoid
  4. D.the potential difference across a resistor
Show answer
Correct answer: B. the force on a current-carrying conductor in a magnetic field

In Fleming's left hand rule the forefinger, the middle finger and the thumb of the left hand are held at right angles to one another: the forefinger points along the magnetic field, the middle finger along the current, and the thumb then gives the direction of the force.

Q8.General ScienceEasy

Electromagnetic induction was discovered by

  1. A.Hans Christian Oersted
  2. B.Michael Faraday
  3. C.Alessandro Volta
  4. D.James Watt
Show answer
Correct answer: B. Michael Faraday

In 1831 Faraday showed that when the magnetic flux linked with a closed coil changes, whether by moving a magnet, moving the coil or changing the current in a nearby coil, a current is induced in it.

Q10.General ScienceHard

Two magnetic field lines can never intersect each other because

  1. A.the field would then be zero at that point
  2. B.there would be two directions of the field at the same point, which is impossible
  3. C.the lines are imaginary
  4. D.the magnetic poles always exist in pairs
Show answer
Correct answer: B. there would be two directions of the field at the same point, which is impossible

The tangent drawn to a magnetic field line at any point gives the direction of the field at that point.

Q12.General ScienceMedium

The resistance of a uniform metallic wire is

  1. A.directly proportional to its area of cross section
  2. B.inversely proportional to its length
  3. C.directly proportional to its length and inversely proportional to its area of cross section
  4. D.independent of both length and area of cross section
Show answer
Correct answer: C. directly proportional to its length and inversely proportional to its area of cross section

The resistance of a wire equals the resistivity of the material multiplied by the length and divided by the area of cross section.

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