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CBSE Class 10 Effects of Electric Current — practice questions — page 4

Explore 163 free Effects of Electric Current questions in CBSE 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 91–120 of 163.

Domestic appliances in India are connected in:Read the answer and worked solution →Electric fuse is a SAFETY device that:Read the answer and worked solution →Oersted's discovery (1820) was that:Read the answer and worked solution →Magnetic field lines:Read the answer and worked solution →The magnetic field inside a long solenoid (with n turns per unit length, carrying current I) is:Read the answer and worked solution →Fleming's left-hand rule gives the direction of:Read the answer and worked solution →An electric motor converts:Read the answer and worked solution →Electromagnetic induction is the phenomenon of:Read the answer and worked solution →AC (Alternating Current) reverses its direction every:Read the answer and worked solution →The colour code in Indian household wiring is: live = red/brown, neutral = black/blue, earth =:Read the answer and worked solution →Earthing of an electrical appliance:Read the answer and worked solution →A short-circuit happens when:Read the answer and worked solution →An electromagnet differs from a permanent magnet in that the electromagnet:Read the answer and worked solution →Direction of force on a current-carrying conductor placed in a magnetic field is reversed if:Read the answer and worked solution →The Earth's magnetic field is roughly comparable to that of:Read the answer and worked solution →Frequency of AC in India is:Read the answer and worked solution →A continuous and closed path of electric current is called an:Read the answer and worked solution →The direction of electric current is taken as opposite to the flow of:Read the answer and worked solution →One ampere is the flow of one coulomb of charge per:Read the answer and worked solution →Which instrument measures electric current?Read the answer and worked solution →An ammeter is always connected in:Read the answer and worked solution →The SI unit of potential difference is the:Read the answer and worked solution →The volt is named after which scientist?Read the answer and worked solution →A voltmeter is always connected in:Read the answer and worked solution →What generates the potential difference across a cell's terminals?Read the answer and worked solution →A graph of potential difference against current is a:Read the answer and worked solution →The SI unit of resistance is the:Read the answer and worked solution →The alloy used in the resistance experiment is:Read the answer and worked solution →In a series combination, the total potential difference is the:Read the answer and worked solution →In a parallel combination, what adds up to give the total?Read the answer and worked solution →

Worked practice questions

Domestic appliances in India are connected in:

  1. Series with each other
  2. Parallel with each other
  3. A mix of series + parallel randomly
  4. Direct contact with the earth wire
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Correct answer: B. Parallel with each other

1. Household appliances are connected in PARALLEL across the live and neutral lines. 2. So each gets the FULL 220 V independently of the others. 3. If one appliance fails or is switched off, the others continue to work — series wouldn't allow that. _Source: syllabus Science Ch 11 §11.5.2 Practical Applications of Parallel_

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Electric fuse is a SAFETY device that:

  1. Increases the circuit current
  2. Reduces power consumption
  3. Melts and breaks overload
  4. Boosts the supply voltage
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Correct answer: C. Melts and breaks overload

1. A fuse is a thin wire with a low melting point connected in series with the appliance. 2. If current exceeds the rated value, Joule heating MELTS the fuse wire and BREAKS the circuit. 3. Prevents fire, overheating, and damage to costlier components. _Source: syllabus Science Ch 11 §11.6.3 Fuse and Safety Measures_

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Oersted's discovery (1820) was that:

  1. A magnet deflects light
  2. Electric charge attracts magnets
  3. Magnetism produces heat
  4. An electric current creates a magnetic field
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Correct answer: D. An electric current creates a magnetic field

1. Oersted observed a compass needle deflecting near a current-carrying wire. 2. This was the first evidence that ELECTRIC CURRENT and MAGNETISM are connected. 3. It set the stage for the unification of electricity and magnetism by Maxwell. _Source: syllabus Science Ch 12 §12.1 Magnetic Effects of Current_

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