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Tamil Nadu SSLC (Class 10) Effects of Electric Current — practice questions — page 3

Explore 94 free Effects of Electric Current questions in Tamil Nadu 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 61–90 of 94.

Two parallel wires carry currents in the SAME direction. They:Read the answer and worked solution →In a domestic three-wire system, which wire provides the safety connection to earth?Read the answer and worked solution →Which of the following is the working principle of an electric generator?Read the answer and worked solution →A straight conductor of length 0.5 m carries 2 A at right angles to a 0.4 T magnetic field. The force on it is:Read the answer and worked solution →Which device is essentially a generator producing AC?Read the answer and worked solution →In a DC motor, what role does the split-ring commutator play?Read the answer and worked solution →A fuse for a 10 A appliance should be rated approximately:Read the answer and worked solution →Match the rule to what it predicts (CBSE Cl 10 Magnetism)Read the answer and worked solution →Sort: AC or DC supply? (CBSE Cl 10)Read the answer and worked solution →True or false on magnetism (CBSE Cl 10)Read the answer and worked solution →Order the steps of motor operation (CBSE Cl 10)Read the answer and worked solution →What is the maximum resistance which can be made using five resistors each of $1/5\ \Omega$?Read the answer and worked solution →What is the minimum resistance which can be made using five resistors each of $1/5\ \Omega$?Read the answer and worked solution →Which of the following represents voltage?Read the answer and worked solution →The resistivity does not change ifRead the answer and worked solution →The strength of magnetic field inside a long current carrying straight solenoid isRead the answer and worked solution →To convert an AC generator into DC generatorRead the answer and worked solution →A conductor carries a steady current and 30 C of charge flows past a point in 6 seconds. What is the current?Read the answer and worked solution →Which physical quantity is defined as the rate of flow of electric charge?Read the answer and worked solution →What is the SI unit of electrical resistance?Read the answer and worked solution →A potential difference of 12 V is applied across a resistor and a current of 3 A flows. What is its resistance?Read the answer and worked solution →Three resistors of 2 ohm, 3 ohm and 5 ohm are joined in series. What is their effective resistance?Read the answer and worked solution →Two resistors of 6 ohm and 3 ohm are connected in parallel. What is the effective resistance of the combination?Read the answer and worked solution →How does the resistance of a metallic wire change when it is made thicker, keeping its length and material the same?Read the answer and worked solution →An electric bulb is rated 60 W at 220 V. What current does it draw when operating normally?Read the answer and worked solution →What does the unit kilowatt hour (kWh) measure?Read the answer and worked solution →An electric heater of power 1000 W is used for 3 hours every day. How much electrical energy does it consume in one day?Read the answer and worked solution →A torch bulb is rated 3 V and draws a current of 600 mA. What electric power does it consume?Read the answer and worked solution →Why does a bulb glow when the switch in a simple circuit is closed?Read the answer and worked solution →A wire of resistance 10 ohm is stretched uniformly until its length becomes three times the original. What is its new resistance?Read the answer and worked solution →

Worked practice questions

Two parallel wires carry currents in the SAME direction. They:

  1. Attract each other
  2. Repel each other
  3. Exert no force on each other
  4. Stop carrying current
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Correct answer: A. Attract each other

1. Each current-carrying wire creates a magnetic field around it. 2. The field of the first wire exerts a force on the second wire via the motor effect. 3. Using Fleming's left-hand rule with parallel co-directional currents, both wires feel inward forces. 4. So the two wires are pulled toward each other. 5. Hence parallel currents in the same direction attract. 6. Opposite currents would repel each other instead. _Source: syllabus Science Ch 13 'Magnetic Effects of Electric Current' (learncbse.in extract)_

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In a domestic three-wire system, which wire provides the safety connection to earth?

  1. Live wire (red)
  2. Earth wire (green)
  3. Neutral wire (black)
  4. Fuse wire (yellow)
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Correct answer: B. Earth wire (green)

1. Indian domestic supply uses three wires: live, neutral, and earth. 2. The live wire is at high potential; the neutral wire returns the current. 3. The earth wire is connected to the metal body of appliances. 4. If a fault makes the body live, current flows safely to earth. 5. The earth wire is colour-coded green in standard wiring. 6. So the green earth wire provides the safety connection. _Source: syllabus Science Ch 13 'Magnetic Effects of Electric Current' (learncbse.in extract)_

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Which of the following is the working principle of an electric generator?

  1. Coulomb's law of electrostatics
  2. Joule heating effect
  3. Electromagnetic induction
  4. Ohm's law
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Correct answer: C. Electromagnetic induction

1. A generator converts mechanical energy into electrical energy. 2. A coil rotates in a magnetic field, changing the flux through the coil. 3. The changing flux induces an EMF in the coil (Faraday's law). 4. This is the principle of electromagnetic induction. 5. So generators work on electromagnetic induction. 6. Ohm's law and Joule heating describe current behaviour, not generation. _Source: syllabus Science Ch 13 'Magnetic Effects of Electric Current' (learncbse.in extract)_

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