Steady Current

Steady Current MDCAT MCQs with answers

14 past paper MCQs on Steady Current, from the Current Electricity unit of MDCAT Physics. The year each question appeared is shown where known; tap “Show answer” for the correct option and a short solution.

Read the notes first Practise the unit as a quiz

1.A charge of 90 C passes through a wire for 30 seconds. The current in the wire will be: (MDCAT 2024)

  1. 3 A
  2. 0.3 A
  3. 3 mA
  4. 0.3 mA
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Correct answer: (a) 3 A

$I=q/t=90/30=3$ A.

2.152.A charge of 90 C passes through a wire for 30 seconds. Then the current in the wire will be: (UHS MDCAT 2024)

  1. 3A
  2. 0.3 A
  3. 3 mA
  4. 0.3 mA
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Correct answer: (a) 3A

$I=q/t=90/30$, which is $3\,\mathrm{A}$.

3.What does one Coulomb represent in terms of charge? (KMU MDCAT 2024)

  1. The amount of charge transported by a current of one Ampere in one second
  2. The charge of one proton
  3. The charge of one electron
  4. The charge required to create a force of 1 Newton between two charges separated by 1meter
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Correct answer: (a) The amount of charge transported by a current of one Ampere in one second

One coulomb is the charge carried past a point by one ampere in one second.

4.The flow of charges produce: (PMC MDCAT 2022)

  1. Current only
  2. Magnetic field only
  3. Electric field only
  4. All of the above
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Correct answer: (d) All of the above

Moving charge is a current, and it carries both an electric and a magnetic field with it.

5.The SI unit of charge is: (PMC MDCAT 2022)

  1. Newton
  2. Coulomb
  3. Pascal
  4. Ampere
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Correct answer: (b) Coulomb

Charge is measured in coulombs.

6.____ potential difference is required for establishing steady current? (PMC MDCAT 2022)

  1. Minimum
  2. Constant
  3. Maximum
  4. Varying
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Correct answer: (b) Constant

A steady current needs a steady potential difference to drive it.

7.SI Unit of current is ? (PMC MDCAT 2022)

  1. Ampere
  2. Volt
  3. Joules
  4. Watt
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Correct answer: (a) Ampere

Current is measured in amperes.

8.Electric current may be defined as: (PMC MDCAT 2022)

  1. Rate of flow of charge
  2. Rate of flow of momentum
  3. Rate of flow of power
  4. Rate of flow of energy
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Correct answer: (a) Rate of flow of charge

Current is the charge passing a point each second.

9.Steady current does not change with respect to _____ (PMC MDCAT 2022)

  1. conductor
  2. source
  3. time
  4. potential difference
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Correct answer: (c) time

A steady current is one whose value does not change with time.

10.Current is ______ physical quantity (PMC MDCAT 2022)

  1. scalar quantity
  2. vector quantity
  3. variable quantity
  4. constant quantity
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Correct answer: (a) scalar quantity

Current has a direction of flow but adds as an ordinary number, so it is a scalar.

11._______ is a source of electrical energy having fixed polarity and terminals. (PMC MDCAT 2022)

  1. Motor
  2. Metals
  3. Battery
  4. Generator
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Correct answer: (c) Battery

A battery has a fixed positive and negative terminal.

12.Kirchhoff’s first law/rule corresponds to: (UHS MDCAT 2019)

  1. Law of conservation of energy
  2. Law Of conservation Of momentum
  3. Law of conservation of charge
  4. Law of conservation of mass
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Correct answer: (c) Law of conservation of charge

What flows into a junction must flow out of it, which is the conservation of charge.

13.Kirchhoff’s first law is manifestation of: (UHS MDCAT 2018)

  1. Law of conservation of momentum
  2. Law of conservation mass
  3. Law of conservation of energy
  4. Law of conservation of charge
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Correct answer: (d) Law of conservation of charge

What flows into a junction must flow out, which is the conservation of charge.

14.The unit for electric charge is Coulomb and one Coulomb in terms of base unit is equivalent to: (UHS MDCAT 2016)

  1. Am
  2. Js-1
  3. As
  4. C
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Correct answer: (c) As

A coulomb is an ampere second.

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