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Karnataka SSLC (Class 10) Effects of Electric Current — practice questions — page 4

Explore 108 free Effects of Electric Current questions in Karnataka SSLC (Class 10) Science. Open each question or exercise to read its content, reference answers and available explanation.

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Effects of Electric Current questions and exercises with answers

Showing questions 91–108 of 108.

A potential difference of 12 V is applied across a $4\ \Omega$ resistor. The current through it isRead the answer and worked solution →The commercial unit of electrical energy, '1 unit', isRead the answer and worked solution →If the resistance of a component is kept constant and the voltage across it is doubled, the current through it willRead the answer and worked solution →The scientist who first showed that an electric current produces a magnetic field wasRead the answer and worked solution →Magnetic field lines outside a bar magnet are directedRead the answer and worked solution →The direction of the magnetic field produced around a straight current-carrying conductor is given by theRead the answer and worked solution →A current-carrying solenoid behaves like aRead the answer and worked solution →The force on a current-carrying conductor placed in a magnetic field is found usingRead the answer and worked solution →An electric motor convertsRead the answer and worked solution →An electric generator works on the principle ofRead the answer and worked solution →The direction of the current induced in a conductor moving in a magnetic field is given byRead the answer and worked solution →In India, the alternating current supplied to homes changes its directionRead the answer and worked solution →In a household wiring, the wire that acts as a safety measure by connecting the metallic body of appliances to the earth is theRead the answer and worked solution →An electric fuse protects a circuit byRead the answer and worked solution →A short circuit occurs whenRead the answer and worked solution →Magnetic field lines are said to be crowded (closer together) where the magnetic field isRead the answer and worked solution →Overloading of a domestic circuit happens whenRead the answer and worked solution →Match each rule to what it givesRead the answer and worked solution →

Worked practice questions

A potential difference of 12 V is applied across a $4\ \Omega$ resistor. The current through it is

  1. 3 A
  2. 48 A
  3. 8 A
  4. 0.33 A
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Correct answer: A. 3 A

1. Ohm's law: $I = V/R$. 2. $I = 12/4 = 3$ A. 3. So a current of 3 A flows. _Source: Karnataka SSLC (KSEEB) Class 10 Science, Ch12 'Electricity', §12.3_

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The commercial unit of electrical energy, '1 unit', is

  1. 1 joule
  2. 1 kilowatt-hour
  3. 1 watt
  4. 1 volt-ampere
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Correct answer: B. 1 kilowatt-hour

1. The joule is too small for household billing. 2. Electrical energy is billed in the **kilowatt-hour (kWh)**, called '1 unit'. 3. $1\ \text{kWh} = 1000\ \text{W} \times 3600\ \text{s} = 3.6\times10^6$ J. _Source: Karnataka SSLC (KSEEB) Class 10 Science, Ch12 'Electricity', §12.6_

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If the resistance of a component is kept constant and the voltage across it is doubled, the current through it will

  1. become half
  2. stay the same
  3. become one-fourth
  4. double
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Correct answer: D. double

1. Ohm's law: $I = V/R$ with R constant, so $I \propto V$. 2. Doubling V doubles I. 3. So the current becomes twice its original value. _Source: Karnataka SSLC (KSEEB) Class 10 Science, Ch12 'Electricity', §12.3_

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