Class 10th Physics Unit 14 Current Electricity MCQs Short Long Notes

physics 10th notes ch 14

1. If a current I ampere flows through a resistance R in time seconds, then the energy supplied will be: 

 
 
 
 

2. The instrument with which we can detect the presence of current in a circuit is knows as:

 
 
 
 

3. Electrical energy is measured in: 

 
 
 
 

4. The conventional current of positive charges flows from a point of: 

 
 
 
 

5. In order to measure the current in a circuit, ammeter should be connected: 

 
 
 
 

6. A good voltmeter is that which draws: 

 
 
 
 

7. The conventional current is due to the flow of: 

 
 
 
 

8. The relation V = IR represents:

 
 
 
 

9. One watt is equal to: 

 
 
 
 

10. Volt is a unit of: 

 
 
 
 

11. In parallel circuit, the magnitude of current that flows through each resistor will be: 

 
 
 
 

12. Materials that obey Ohm’s law have constant: 

 
 
 
 

13. Which one of the following bulbs has least resistance? 

 
 
 
 

14. In electrolyte, current is produced due to the flow of: 

 
 
 
 

15. Thermistor is: 

 
 
 
 

16. At a certain temperature, the resistance of a wire is directly proportional to its: 

 
 
 
 

17. If 1 ampere current flows through 2m long conductor, the charge flow through this in 1hour will be: 

 
 
 
 

18. Which of the following represents an electric current?

 
 
 
 

19. The direction of the electronic current in the closed circuit is:

 
 
 
 

20. The SI unit of electrical power is: 

 
 
 
 

21. The potential difference can be directly measured by the instrument known as: 

 
 
 
 

22. Electrical energy is commonly consumed in very large quantity and hence a large unit of energy is To Find which is known as: 

 
 
 
 

23. The resistance of a conductor through which a current of one ampere is flowing when the potential difference across its ends is one volt, is called:

 
 
 
 

24. The potential drop across each of resistors will be same in:

 
 
 
 

25. Three resistance 5000, 500 and 50 ohms are connected in series across 555 volts mains. The current flowing through them will be:

 
 
 
 

26. If a charge ‘Q’ flows through any cross-section of the conductor in time ‘t’ second, the current ‘I’ is given by:

 
 
 
 

27. When we connect a battery across a conductor, the energy is provided to the charges in the conductor by the? 

 
 
 
 

28. In electricity, we assume that electric current is always due to the flow of:

 
 
 
 

29. Energy is produced to transfer the electrons from positive terminal of the battery to the negative terminal by the: 

 
 
 
 

30. In order to detect the current, galvanometer is connected: 

 
 
 
 

31. Ohm’s law is applicable to:

 
 
 
 

32. In series circuit, the magnitude of current that flows through each resistor is:

 
 
 
 

33. The direction of conventional current flowing in a circuit is:

 
 
 
 

34. The unit of potential difference is named after:

 
 
 
 

35. The amount of energy supplied by current in unit time is known as: 

 
 
 
 

36. The value of current passing through a conductor is directly proportional to the: 

 
 
 
 

37. If we increase the length of a wire to four times of its original length, what will be its resistance? 

 
 
 
 

38. A galvanometer has been named after:

 
 
 
 

39. The energy To Find to move a charge from one point to another in the circuit is called: 

 
 
 
 

40. If we increase the temperature of a conductor, its resistance will:

 
 
 
 

41. The SI unit of electric current is: 

 
 
 
 

42. In liquids and gases, the current is due to the motion of:

 
 
 
 

43. If we increase the cross-sectional area of the wire to double of its original area, its resistance will become:  

 
 
 
 

44. In metals, current is produced only due to the flow of:

 
 
 
 

45. The current due to negative charges and an equivalent current due to positive charges always flow in the:

 
 
 
 

46. Voltmeter is always connected in a circuit in:

 
 
 
 

47. The series resistance which is connected with galvanometer to convert it into voltmeter usually has value in: 

 
 
 
 

48. A resistance which is connected with the galvanometer in order to convert it into ammeter should have:

 
 
 
 

49. One kilowatt-hour is equal to: 

 
 
 
 

50. The energy supplied in driving one coulomb of charge round a complete circuit in which the cell is connected is called: 

 
 
 
 

51. The resistance of a meter cube of the substance is called:

 
 
 
 

52. The property of a substance which opposes the flow of current through it is called:

 
 
 
 

53. Batteries convert: 

 
 
 
 

54. Ohm is the unit of:

 
 
 
 

55. One coulomb per second is equal to:

 
 
 
 

56. The resistance of an ammeter should be:

 
 
 
 

57. Free electrons are:

 
 
 
 

58. The resistances are connected end to end and provide only one path for current in:

 
 
 
 

59. Ohm is Appreciated as:

 
 
 
 

60. When resistors are connected in series, the equivalent resistance is equal to?

 
 
 
 

61. Kilowatt – hour is a unit of: 

 
 
 
 

62. At a certain temperature, the resistance of a wire is inversely proportional to its:

 
 
 
 

63. The rate of flow of electric charge through any cross-sectional area is called:

 
 
 
 

64. The electronic current is due to the flow of: 

 
 
 
 

65. If the resistors are connected in parallel, then:

 
 
 
 

66. The shape of the graph of Ohmic conductor is:

 
 
 
 

67. The resistance of a conductor does not depend on its:

 
 
 
 

68. The graphical representation of Ohm’s law is:

 
 
 
 

69. A galvanometer is a very:

 
 
 
 

70. How will you calculate power from current (I) and voltage (v)?

 
 
 
 

71. Materials having resistance that changes with voltage or current are called:

 
 
 
 

72. The energy supplied W = I²Rt is the mathematical expression for: 

 
 
 
 

73. The current constituted by negative charges flows from a point of: 

 
 
 
 

74. When ammeter is connected in the circuit, the positive terminal of ammeter should be connected with the? 

 
 
 
 

75. If the resistance of 2 ohm and 4 ohm are connected in parallel, the equivalent resistance will be:

 
 
 
 

76. If the needle of galvanometer shows some deflection, it would indicate the: 

 
 
 
 

Short Questions

A light bulb is switched on for 40s. If the electrical energy consumed by the bulb during this time is 2400 J, find the power of the bulb. 
Can current flow in a circuit without potential difference?
Define resistance and its units.
Define ammeter and voltmeter?
Define electric current with the help of diagram.
Define electric current.
Define electric power
Define kilowatt hour?
Define non-ohmic conductors.
Define Ohmic conductors.
Define resistance and its unit
Define thermister.
Define unit of current.
Describe four safety measures that should be taken in connection with the household circuit.
Describe briefly the hazards of household electricity.
Describe the flow of charge in a circuit.
Determine the equivalent resistance of series combination of resistors.
Discuss the main features of parallel combination of resistors.
How a battery does raises electrical charge back up to higher voltage (energy)?
How a galvanometer is converted into ammeter?
How a galvanometer is converted into voltmeter?
How can we differentiate between e.m.f. and potential difference?
How can you determine the overall resistance of all the resistors having same resistance connected in parallel combination?
How do we use the heating effect of current for different purposes?
How does an energy saver save energy?
How energy is obtained due to flow of charges?
How long does it take a current of 10 mA to deliver 30 C of charge? 
How will you calculate the cost of electricity?
In electrolyte which charge are responsible for the flow of current?
In order to measure current in a circuit why ammeter is always connected in series?
In order to measure voltage in a circuit voltmeter is always connected in parallel.
State and explain Ohm’s law. Write down its limitations. 
State جول’s Law.
Two points on an object are at different electric potentials. Does charge necessarily flow between them?
Upon which factor does resistivity depend?
What is the difference between a cell and a battery?
What is the difference between conductors and insulators?
What is the difference between electronic current and conventional current?
What is difference between D.C and A.C?
What are the advantages of parallel combination over series combination?
What are the factors upon which the resistance of a conductor depends?
What do you know about a circuit diagram?
What information do we get from the power rating of an electrical appliance?
What is meant by conventional current? 
What would be the effect on the brightness of three bulbs connected in parallel to a small 2.5 V battery? Does the brightness of the bulbs differ from the bulbs connected in the series with the battery? Explain.
Which metal is used as the filament of an electric bulb? Explain with reason. 
Which type of charge is responsible for the flow of current in metallic conductors?
Why does the resistance of a conductor increase with the rise of its temperature?
Why in conductors charge is transferred by free electrons rather than by positive charges?
Why resistance of the ammeter is kept low?
Why resistance of the voltmeter is kept high?
Why there is no current in conductor in the absence of external source despite it has free electrons? 
Write down the uses of voltmeter and ammeter.

Long Questions

A 100 W lamp bulb and a 4 kW water heater are connected to a 250 V supply. Calculate (a) the current which flows in each appliance (b) the resistance of each appliance when in use.
A current of 3 mA is flowing through a wire for 1 minute. What is the charge flowing through the wire?
A house is installed with
(a) 10 bulbs of 60 W each of which are used 5 hours daily.
(b) 4 fans of 75 W each of which run 10 hours daily.
(c) One T.V. of 100 W which is used for 5 hours daily.
(d) One electric iron of 1000 W which is used for 2 hours daily.
If the cost of one unit of electricity is Rs.4. Find the monthly expenditure of electricity (one month =30 days).
A resistor of resistance 5.6 Ω is connected across a battery of 3.0 V by means of a wire of negligible resistance. A current of 0.5 A passes through the resistor .
Calculate
(a) Power dissipated in the resistor .
(b) Total power produced by the battery.
(c) Give the reason of difference between these two quantities.
An electric bulb is marked with 220 V, 100 W. Find the resistance of the filament of the bulb. If the bulb is used 5 hours daily, find the energy in kilowatt-hour consumed by the bulb in one month (30 days).
An incandescent light bulb with an operating resistance of 95 Ω is labelled “150 W.” Is this bulb designed for use in a 120 V circuit or a 220 V circuit?
At 100,000 Ω, how much current flows through your body if you touch the terminals of a 12 V battery? If your skin is wet, so that your resistance is only 1000 Ω, how much current would you receive from the same battery?
By applying a potential difference of 10 V across a conductor , a current of 1.5 A passes through it. How much energy would be obtained from the current in 2 minutes?
Define the term electric current? What is conventional current?
Describe briefly the hazards of household electricity.
Determine the equivalent resistance of parallel combination of resistors?
Determine the equivalent resistance of series combination of resistors?
Differentiate between ohmic and non-ohmic substances?
Explain the energy dissipation in a resistance. What is جول’s law?
Explain Ohm’s law. What are its limitations?
Explain the term specific resistance?
How the current and the potential difference are measured in an electric circuit.
The resistance of a conductor wire is 10 MΩ. If a potential difference of 100 volts is applied across its ends, then find the value of current passing through it in mA.
Two resistances of 6 k and 12 kΩ are connected in parallel. A 6 V battery is Ω connected across its ends, find the values of the following quantities:
(a) Equivalent resistance of the parallel combination.
(b) Current passing through each of the resistances.
(c) Potential difference across each of the resistance.
Two resistances of 2 kΩ and 8 kΩ are joined in series, if a 10 V battery is connected across the ends of this combination, find the following quantities:
(a) The equivalent resistance of the series combination.
(b) Current passing through each of the resistances.
(c) The potential difference across each resistance.
What do we mean by the term e.m.f? Is it really a force? Explain.
What do you mean by the term electric potential difference?
What is difference between DC and AC? Discuss the supply to a house and house wiring.
What is electrical power? Discuss the unit Kilowatt hour?
What is meant by the electric potential of the battery?
What is the difference between conductors and insulators?
What is the use of a fuse in domestic electricity circuits?
What is the use of circuit breaker and earth wire in household circuits?
Write briefly about the measurement of e.m.f?

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