Trending ▼   ResFinder  

ICSE Class X Question Bank 2025 : Physics

10 pages, 0 questions, 0 questions with responses, 0 total responses,    0    0
hetvi Pandit
Euroschool Airoli, Mumbai
+Fave Message
ProfileTimelineUploads
 Home > hetvihp >

Formatting page ...

ICSE-X PHYSICS BY MOHAN BHATT 917 222 8888 CURRENT ELECTRICITY 2023 1. When a current I flows through a wire of resistance R for time t then the electrical energy produced is given by: a. I2Rt b. IR2t c. IRt d. IRt2 2. Choose the correct relation for e.m.f. ( ) and terminal voltage V: a. = V (always) b. V > (always) c. V< (when the cell is in use) d. None of these 3. A geyser is rated 240 W - 220 V. Explain the meaning of this statement. 4. a. Define specific resistance. b. What happens to the specific resistance when length is doubled? c. Name a substance whose specific resistance remains almost unchanged with increase in its temperature. 5. Find the value of current I drawn from the cell. a. Calculate the current I. b. Calculate the terminal Voltage. 2022 6. The graph plotted for potential difference (V) against current (I) for ohmic resistors is a. a curve passing through the origin b. a straight line not passing through origin c. a straight line passing through origin d. a circle centered at the origin 7. An appliance rated 440 W, 220 V is connected across 220 V supply. Calculate a. the maximum current that the appliance can draw. b. Calculate the resistance of the appliance. 8. If a wire of resistance 2 ohm gets stretched to thrice its original length a. Calculate the new resistance of the wire. b. What happens to the specific resistance of the wire? 1 ICSE-X PHYSICS BY MOHAN BHATT 917 222 8888 In the above circuit diagram, a. calculate the external resistance of the circuit b. the current 12 c. the current I 2020 9. Calculate the total resistance across AB 10. Define a kilowatt hour. How is it related to joule? 11. a. What are superconductors? b. Calculate the current drawn by an appliance rated 110 W, 220 V when connected across 220 V supply. c. Name a substance whose resistance decreases with the increase in temperature. 12. The diagram above shows three resistors connected across a cell of emf 1.8 V and internal resistance r. Calculate a. current through 3 ohm resistor b. the internal resistance r. 2019 13. Calculate the effective resistance across AB. 14. How does an increase in the temperature affect the specific resistance of a a. metal? 2 ICSE-X PHYSICS BY MOHAN BHATT 917 222 8888 b. semiconductor? 15. The above figure shows a circuit with the key K open, Calculate a. the resistance of the circuit when the key K is open. b. the current drawn from the cell when the key K is open. c. the resistance of the circuit when the key K is closed. d. the current drawn from the cell when the key K is closed. 2018 16. You have three resistors of values 2 ohm, 3 ohm and 5 ohm. How will you join them, so that the total resistance is more than 7 ohm? a. Draw a diagram for the arrangement. b. Calculate the equivalent resistance. 17. Find the equivalent resistance between A and B. 18. 2017 19. 20. 21. State whether the resistivity of a wire changes with the change in the thickness of the wire. Which particles are responsible for current in conductors? Define specific resistance and state its SI unit. An electric bulb of resistance 500 , draws a current of 0.4A. Calculate the power of the bulb and the potential difference at its end. 2016 22. Which particles are responsible for current in conductors? 23. A music system draws a current of 400 mA, when connected to a 12 V battery. a. What is the resistance of the music system? b. The music system is left playing for several hours and finally the battery voltage drops and the music system stops playing when the current drops to 320 mA. At what battery voltage does the music system stop playing? 24. Calculate the quantity of heat produced in a 20 ohm resistor carrying 2.5 A current in 5 min. 25. A battery of emf 12V and internal resistance 2 ohm is connected with two resistors A and B of resistance 4 ohm and 6 ohm respectively, joined in series. 3 ICSE-X PHYSICS BY MOHAN BHATT 917 222 8888 a. current in the circuit. b. the terminal voltage of the cell. c. the potential difference across 6 ohm resistor. d. electrical energy spent per minute in a 4 ohm resistor. 26. The VI graph for a series combination and for a parallel combination of two resistors is shown in the figure below. Which of the two A or B, represents the parallel combination? Give a reason for your answer. 2015 27. What happens to the resistivity of semiconductors with the increase in temperature? 28. The relationship between the potential difference and the current in a conductor is stated in the form of a law. a. Name the law. b. What does the slope of the VI graph for a conductor represent? c. Name the material used for making the connecting wire. 29. A cell of emf 2V and internal resistance 1.2 ohm is connected with an ammeter of resistance 0.8 ohm and two resistors of 4.5 ohm and 9 ohm as shown in the diagram below: a. What would be the reading on the ammeter? 4 ICSE-X PHYSICS BY MOHAN BHATT 917 222 8888 b. What is the potential difference across the terminals of the cell? 30. Name the physical quantity measured in terms of horse power. 31. 1 kWh = - J 2014 32. a. What is an ohmic resistor? b. Two copper wires are of the same length, but one is thicker than the other. i. Which wire will have more resistance? ii. Which wire will have more specific resistance? 33. Two resistors of 4 ohm and 6 ohm are connected in parallel to a cell to draw 0.5 A current from the cell. a. Draw a labeled circuit diagram showing the above arrangement. b. Calculate the current in each resistor. 34. What is consumed using different electrical appliances, for which electricity bills are paid? 2013 35. a. State Ohm's law. b. A metal wire of resistance 6 ohm is stretched, so that its length is increased to twice its original length. Calculate its new resistance. 2012 36. Three resistors are connected to a 6 V battery as shown in the figure: Calculate a. the equivalent resistance of the circuit. b. total current in the circuit. c. potential difference across the 7.2 ohm resistor. 37. An electrical appliance is rated at 1000 kW, 220 V. If the appliance is operated for 2 h, calculate the energy consumed by the appliance in a. kWh b. joule 38. a. Write an expression for the electrical energy spent in the flow of current through an electrical appliance in terms of I, Rand t. b. At what voltage is the alternating current supplied to our houses? c. How should the electric lamps in a building be connected? 39. The figure shows a circuit, when the circuit is switched on, the ammeter reads 0.5 A. 5 ICSE-X PHYSICS BY MOHAN BHATT 917 222 8888 a. Calculate the value of the unknown resistor R. b. Calculate the charge passing through the 3 ohm resistor in 120 s. c. Calculate the power dissipated in the 3 ohm resistor 2011 40. a. Draw a graph of potential difference (V) versus current (I) for an ohmic resistor. b. How can you find the resistance of the resistor from this graph? c. What is a non-ohmic resistor? 41. Three resistors are connected to a 12 V battery as shown in the figure given here. a. What is the current through the 8 ohm resistors? b. What is the potential difference across the parallel combination of 6 ohm and 12 ohm resistors? c. What is the current through the 6 ohm resistor? 42. Two bulbs are marked 100 W, 220 V and 60 W, 110 V. Calculate the ratio of their resistances. 43. a. An electric bulb is marked 100 W, 250 V. What information does this convey? b. How much current will the bulb draw, if connected to a 250 V supply? 2010 44. a. A substance has nearly zero resistance at a temperature of IK. What is such a substance called? b. State any two factors which affect the resistance of a metallic wire. 45. a. Write an expression for calculating electrical power in terms of current and resistance. b. State a relation between electrical power, resistance and potential difference in an electrical circuit. 46. Calculate the quantity of heat that will be produced in a coil of resistance 75 Q, if a current of 2 A is passed through it for 2 min. 2009 47. The equivalent resistance of the following circuit diagram is 4 ohm. Calculate the value of x. 6 ICSE-X PHYSICS BY MOHAN BHATT 917 222 8888 48. a. State Ohm's law. b. Diagrammatically illustrate how you would connect a key, a battery, a voltmeter, an ammeter, an unknown resistance R and a rheostat, so that it can be used to verify the above law. 49. An electric heater is rated 1000 W - 200 V. Calculate a. the resistance of the heating element. b. the current flowing through it. 2008 50. a. Sketch a graph to show the change in potential difference across the ends of an ohmic resistor and the current flowing in it. Label the axes of your graph b. What does the slope of the graph represent? 51. Three resistors of 6.0 ohm, 2.0 ohm and 4.0 ohm respectively are joined together as shown in the figure. The resistors are connected to an ammeter and to a cell of emf 6.0 V. Calculate a. the effective resistance of the circuit. b. the current drawn from the cell. 52. An electrical heater is rated 4 kW, 220 V. Find the cost of using this heater for 12 h, if one kWh of electrical energy costs 3.25. 53. How does the heat produced in a wire or a conductor depend upon the a. current passing through the conductor? b. resistance of the conductor? 2007 54. The VI graph for a series combination and for a parallel combination of two resistors is shown in the figure below. Which of the two A or B, represents the parallel combination? Give a reason for your answer. 55. Mention two factors on which the resistance of a wire depends. 56. A cell of emf 1.5 V and internal resistance 1.0 are connected to two resistors of 4 ohm and 20.ohm in series as shown in the figure. 7 ICSE-X PHYSICS BY MOHAN BHATT 917 222 8888 Calculate a. the current in the circuit. b. potential difference across the 4 ohm resistor. c. voltage drops across internal resistance when the current is flowing. d. potential difference across the cell. 2006 57. A wire of a uniform thickness with a resistance of 27 ohm is cut into three equal pieces and they are joined in parallel. Find the resistance of the parallel combination. 58. Find the cost of operating an electric toaster for two hours, if it draws 8 A current on a 110 V circuit. The cost of electrical energy is 2.50 per kWh. 59. In the figure given alongside, the ammeter A reads 0.3 A. Calculate a. b. c. 2005 60. the total resistance of the circuit. the value of R. the current flowing through R Four resistances of 2 ohm each are joined end to end, to form a square ABCD. Calculate the equivalent resistance of the combination between any two adjacent corners. 61. An electrical appliance is rated 1500 W, 250 V. This appliance is connected to 250 V mains.Calculate a. the current drawn. b. the electrical energy consumed in 60 h. c. the cost of electrical energy consumed at 2.50 per kWh. 62. In the figure given alongside A, B and Care three ammeters. The ammeter B reads 0.5 A. (All the ammeters have negligible resistance). Calculate a. the readings in the ammeters A and C. b. the total resistance of the circuit. 8 ICSE-X PHYSICS BY MOHAN BHATT 917 222 8888 2004 63. Mention two factors on which the internal resistance of a cell depends. 64. An electric bulb rated 220 V, 60 W is working on its full efficiency. Calculate the electric resistance of the bulb. 2003 65. A cell of emf 1.5 V and internal resistance 10 ohm are connected to a resistor of 5 ohm with an ammeter in series. What is the reading of the ammeter? 66. a. Which of the two wires of similar dimensions, copper or nichrome, would you use for the electric heater element? Give reasons to justify your answer. b. Two fuse wires of the same length are rated 5 A and 20 A. Which of the two fuse wires is thicker and why? 67. An electric kettle is rated 2.5 kW, 250 V. Find the cost of running the kettle for two hours at 60 paise per unit. 68. With reference to the diagram given below, calculate a. the equivalent resistance between P and O. b. the reading of an ammeter. c. the electrical power between P and O 69. Electrical power P is given by an expression P = QV/time a. What do the symbols and V represent? b. Express power in terms of current and resistance explaining the symbols used there in. 2002 70. Four cells, each of emf 1.5 V and internal resistance 2 ohm are connected in a parallel. The battery of the cells is connected to an external resistance of 2.5 ohm. Calculate a. the total resistance of the circuit. b. the current flowing in the external circuit. c. the drop in potential across the terminals of the cells. 71. A geyser has a label 2 kW, 240 V. What is the cost of using it for 30 min, if the cost of electricity is 3 per commercial unit? 2001 72. Define the emf (E) of a cell and the potential difference (V) across a resistor (R) in terms of the work done in moving a unit charge. State the relation between these two works and the work done in moving a unit charge through a cell connected across the resistor. Take the internal resistance of the cell as r. Hence, obtain an expression for the current i in the circuit 73. A family uses a light bulb of 100 W, a fan of 100 W and a heater of 1000 W, each for 8 h a day. If the cost of electricity is 2 per unit, what is the expenditure for the family per day on electricity? 2000 9 ICSE-X PHYSICS BY MOHAN BHATT 917 222 8888 74. Calculate the electrical energy in SI units consumed by a 100 W bulb and a 60 W fan connected in parallel for 5 min. 75. In the figure shown calculate: a. The value of the combined resistance of 40 ohm and R, using the readings of the two meters. b. The value of R c. The current flowing through R. 10

Formatting page ...

Formatting page ...

Formatting page ...

Formatting page ...

Formatting page ...

Formatting page ...

Formatting page ...

Formatting page ...

Formatting page ...

 

  Print intermediate debugging step

Show debugging info


 

 

© 2010 - 2025 ResPaper. Terms of ServiceContact Us Advertise with us

 

hetvihp chat