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Maharashtra SSC (Class 10) Effects of Electric Current — practice questions — page 4

Explore 96 free Effects of Electric Current questions in Maharashtra SSC (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 91–96 of 96.

In Fleming's left-hand rule, with the thumb, index finger and middle finger held mutually perpendicular, the middle finger indicates the direction of the:Read the answer and worked solution →An electric motor is a device that converts:Read the answer and worked solution →Electromagnetic induction is best described as the:Read the answer and worked solution →Which scientist demonstrated in 1831 that an electric current can be produced in a conductor with the help of a moving magnet?Read the answer and worked solution →Fleming's right-hand rule gives the direction of the induced current. In this rule, the thumb points along the direction of:Read the answer and worked solution →In India, the frequency of the alternating current (AC) supplied by power stations is:Read the answer and worked solution →

Worked practice questions

In Fleming's left-hand rule, with the thumb, index finger and middle finger held mutually perpendicular, the middle finger indicates the direction of the:

  1. Force on the conductor
  2. Induced EMF
  3. Magnetic field
  4. Current
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Correct answer: D. Current

1. Fleming's left-hand rule relates current, field and force for a conductor in a magnetic field. 2. The chapter assigns: index finger to the magnetic field, middle finger to the current, and thumb to the force. 3. So the middle finger gives the current direction. 4. The option the magnetic field is given by the index finger, not the middle finger. _Source: Balbharati (Maharashtra Board) Class 10 Science & Technology, Ch 4 "Effects of Electric Current", p.64_

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An electric motor is a device that converts:

  1. Electrical energy into mechanical energy
  2. Mechanical energy into electrical energy
  3. Electrical energy into heat energy only
  4. Chemical energy into electrical energy
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Correct answer: A. Electrical energy into mechanical energy

1. A motor uses the force on a current-carrying coil in a magnetic field to make the coil rotate. 2. The chapter defines an electric motor as a device changing electrical energy into mechanical energy. 3. The option is the function of a generator, which is the reverse device, so it is wrong. _Source: Balbharati (Maharashtra Board) Class 10 Science & Technology, Ch 4 "Effects of Electric Current", p.64_

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Electromagnetic induction is best described as the:

  1. Charging of an electric conductor by rubbing or friction
  2. Production of a magnetic field by a current flowing in a coil
  3. Generation of a current in a coil by relative motion of a magnet
  4. Rotation of a coil around its axle inside an electric motor
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Correct answer: C. Generation of a current in a coil by relative motion of a magnet

1. Faraday showed in 1831 that a moving magnet can produce a current in a conductor. 2. The chapter defines induction as the generation of a current in a coil due to relative motion between the coil and the magnet, i.e. a change in the magnetic lines through the coil. 3. The option describes the magnetic effect of a current, which is the reverse phenomenon, so it is rejected. _Source: Balbharati (Maharashtra Board) Class 10 Science & Technology, Ch 4 "Effects of Electric Current", p.69_

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