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ICSE Class X Prelims 2020 : Physics (Cambridge School, Kandivali, Mumbai)

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experT U T Academy Current Electricity Test 28 marks,35 min 1. Write the value of charge and mass of electron. 1 2. How many electrons constitute a charge of three coulombs? 1 3. Define potential difference. Give its units. 1 4. Does ammeter have high resistance? 1 5. How is the potential difference maintained across the ends of a conductor? 2 6. State ohm s law. What are non-ohmic conductors? 2 7. A current of 2A flows through a 12V car headlight bulb for 6 minutes. How much energy transfer occurs during this time? 2 8. Electricians wear rubber sandals or shoes or rubber hand gloves while working, why? 3 9. An electric iron is used on a 240V supply and draws a current of 4 Ampere? (a) What is its power? (b) What is its resistance? (c) What is the cost of using the iron for the month of January 10 hours a day if 1 kwh costs Rs.3.40? 3 10. What is the difference between an electromagnet and a permanent magnet? 3 11. How much work is done in moving a body carrying charge equivalent to that on 5x1019 electrons from a point at 25 volts to a point at 40 volts? 3 12. Describe an experiment to show that a current carrying conductor experiences a force in a magnetic field and that the direction of force depends on the direction of (a) the magnetic field, and (b) the current. 5

 

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