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Maharashtra SSC (Class 10) Effects of Electric Current — practice questions — page 3

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 61–90 of 96.

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 →A resistor of 22 Ω is connected across a 220 V supply. What is the electrical power dissipated in it?Read the answer and worked solution →A cell connected across a 9 Ω resistance produces heat at the rate of 400 J per second. What is the potential difference applied across the resistance?Read the answer and worked solution →An electric iron uses 1100 W at its higher setting on a 220 V supply. What current does it draw at this setting?Read the answer and worked solution →An electric iron at its lower setting uses 330 W on a 220 V supply. What is the resistance of the iron at this setting?Read the answer and worked solution →A tungsten bulb on a 220 V supply draws a current of 0.45 A. What is its power rating?Read the answer and worked solution →A 99 W bulb is kept switched on for 10 hours. How many units (kWh) of electrical energy does it consume?Read the answer and worked solution →According to Joule's law of heating, the heat produced in a resistor R carrying current I for time t is given by which expression?Read the answer and worked solution →One unit of electrical energy on a domestic bill equals 1 kWh. Expressed in joules, 1 kWh is equal to:Read the answer and worked solution →Heat energy is produced in a resistor of a circuit at the rate of 100 W while a current of 3 A flows through it. What is the value of the resistance?Read the answer and worked solution →Two tungsten bulbs of 100 W and 60 W are connected in parallel across a 220 V supply. What is the total current drawn from the mains?Read the answer and worked solution →Which consumes more electrical energy: a 500 W TV set running for 30 minutes, or a 600 W heater running for 20 minutes?Read the answer and worked solution →An electric iron of 1100 W is operated for 2 hours daily through April at a tariff of Rs 5 per unit. What is the monthly electricity cost?Read the answer and worked solution →Which alloy is used as the resistive coil in heating appliances like electric heaters and cookers because of its high resistivity?Read the answer and worked solution →In an electric bulb the filament gets heated to nearly 3400 °C and emits light. Which material is used for this filament?Read the answer and worked solution →In a domestic supply, the 'live' and 'neutral' wires are maintained at a potential difference of:Read the answer and worked solution →Which scientist observed in 1820 that a magnetic needle near a current-carrying wire turns through an angle, revealing the link between electricity and magnetism?Read the answer and worked solution →A solenoid has n turns instead of a single loop, with the same current. Compared with a single loop, the magnetic field it produces is:Read the answer and worked solution →The magnetic field produced by a current-carrying solenoid most closely resembles the field of a:Read the answer and worked solution →A current-carrying conductor is placed in a magnetic field. The force on it is maximum when the current is directed: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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