MCQs of Class 10 Science Book Chapter 12 – Electricity.
1. Which of the given is the SI Unit of Electric Current?
A. Ohm
B. Ampere
C. Volt
D. Faraday
2. The hindrance presented by material of conductor to the smooth passing of electric current is known as:
A. Resistance
B. Conductance
C. Inductance
D. None of these
3. A fuse wire is inserted in which wire?
A. Live wire
B. In the neutral wire
C. In the earth wire
D. May be connected in any line
4. The rate of flow of an electric charge is known as :
A. Electric potential
B. Electric conductance
C. Electric current
D. None of these
5. The instrument used for measuring electric current is :
A. Ammeter
B. Galvanometer
C. Voltmeter
D. Potentiometer
6. The amount of work done in joules, when one unit electric charge moves from one point to another point in an electric circuit is called :
A. Electric current
B. Electric resistance
C. Electric conductance
D. Potential difference
7. The unit of potential difference is :
A. Volt
B. Ohm
C. Ampere
D. Faraday
8. The relation between potential difference (V) and current (I) is :
A. V α I2
B. V α 1/I
C. V2 α I
D. V α I
9. The relation between potential difference (V) and current (I) was discovered by :
A. Newton
B. Ampere
C. Ohm
D. Volta
10. The obstruction offered by material of conductor to the passage of electric current is known as :
A. Resistance
B. Conductance
C. Inductance
D. None of these
11. The SI unit of resistance is :
A. Newton
B. Ohm
C. Watt
D. Joule
12. Which of the given statements is not true, regarding the electrical set-up for the verification of Ohm’s law:
A. The voltmeter is connected in parallel with the known resistance
B. The ammeter is connected in series circuit
C. The rheostat can only increase the resistance in electric circuit
D. The single key is used to switch on/off the electric circuit
13. A voltmeter is used to find p.d. in any electrical circuit which of the statement given below is true :
A. A voltmeter is a high resistance instrument and is connected in series circuit
B. A voltmeter is a low resistance instrument and is connected in series circuit
C. A voltmeter is a high resistance instrument and is connected in parallel circuit
D. A voltmeter is a low resistance instrument and is connected in series circuit
14. A battery of 12V is connected in series with resistors of 0.2 ohm, 0.3 ohm, 0.4 ohm, 0.5 ohm and 12 ohm. How much current would flow through the 0.3 ohm resistor?
A. 0.895A
B. 1.11A
C. 0.5A
D. None of these
15. On which of the given resistance does not depend :
A. Length of conductor
B. Area of cross-section
C. Temperature
D. Density
16. In parallel combination of electrical appliances, total electrical power
A. Increase
B. Decrease
C. Does not change
D. Remain same
17. How the charge will flow?
A. By heating them
B. By applying potential difference
C. Both
D. None of these
18. If length of a conductor and it's radius is increased twice, how the resistance will change?
A. Resistance will remain unchanged
B. Resistance increase twice
C. Resistance will become half
D. Resistance will increase 4 times
19. The potential difference applied is directly proportional to current only if
A. Always
B. Never
C. Sometimes
D. When temperature is constant 20. Equipment resistance of 4 4Ω resistance in parallel is
A. 4Ω
B. 1Ω
C. 2Ω
D. 16Ω
21. Which of the given conditions represent more resistance at constant temperature?
A. The red line
B. The yellow line
C. Both are equal
D. Can't be said
22. There is wire of length I and cross section A. Which of the given have least resistance?
A. Length doubled, Area halved
B. Length tripled, Area doubled
C. Length halved, Area doubled
D. The original wire
23. On which of the given parameters specific resistance depends?
A. Length of wire
B. Area of wire
C. Current passing through it
D. Temperature
24. A resistor of length l is connected to a battery and current l is given through it. If it is divided into 3 parts by length. And all having the same cross sectional area are connected in series with the same battery, the current flowing through them will be?
A. l/3
B. 3l
C. l
D. 3l/2
25. Two resistances R1 and R2 are connected with a cell in parallel. Find the ratio of current flowing through R1 to the current flowing through R2.
A. R1:R2
B. R2:R1
C. 1.01
D. Data not sufficient
26. Which of the given statements is true regarding ammeter and voltmeter?
A. Ammeter is connected in series with the required device, Voltmeter in parallel
B. Both ammeter and voltmeter are connected in series with required device
C. The voltmeter is connected in series with the device, Ammeter in parallel
D. They can be connected in any way
27. Amount of energy delivered by a power of one kilowatt in one hour is called _______
A. Kilogram-second
B. Kilowatt-second
C. Watt-hour
D. Kilowatt-hour
28. In SI unit, JC⁻¹ is equal to
A. Volt
B. Newton's law
C. Pascal
D. Omega
29. Materials having non linear voltage current relationship are ____
A. Ohmic
B. Non-ohmic
C. Batteries
D. Capacitors
30. Due to flow of positive or negative charges or both charges at a same time, ______
A. Electric current is produced
B. Light is produced
C. Heat is produced
D. Air is produced
31. In a filament type light bulb, most of the electric power consumed appears as:
A. Visible light
B. Infra-red rays
C. Ultraviolet rays
D. Fluorescent light
32. At a given time, a house is supplied with 100 A at 220 V. How many 75 W, 220 V light bulbs could be switched on in the house at the same time (if they are all connected in parallel)?
A. 93
B. 193
C. 293
D. 393
33. If the current flowing through a fixed resistor is halved, the heat produced in it will become:
A. Double
B. Half
C. One-fourth
D. Four times
34. A wire of resistance R1 is cut into five equal pieces. These five pieces of wire are then connected in parallel. If the resultant resistance of this combination be R2, then the ratio R1 / R2 is:
A. Jan-25
B. 01-May
C. 5
D. 25
35. The heat produced by passing an electric current through a fixed resistor is proportional to the square of:
A. Magnitude of resistance of the resistor
B. Temperature of the resistor
C. Magnitude of current
D. Time for which current is passed
36. An electric heater is rated at 2 Kw. Electrical energy costs Rs 4 per k Wh. What is the cost of using the heater for 3 hours?
A. Rs. 12
B. Rs. 24
C. Rs. 36
D. Rs. 48
37 The commercial unit of energy is:
A. Watt
B. Watt-hour
C. Kilowatt-hour
D. Kilo-joule
38. An electric fuse works on the:
A. Chemical effect of current
B. Magnetic effect of current
C. Lighting effect of current
D. Heating effect of current
39. If the amount of electric charge passing through a conductor in 10 minutes is 300 C, the current flowing is:
A. 30 A
B. 12.03 AM
C. 12.05 AM
D. 5.00 AM
40. The resistivity of copper metal depends on only one of the following factors. This factor is:
A. Length
B. Thickness
C. Temperature
D. Area of cross-section
41. When a 4 Ω resistor is connected across the terminals of a 12 V battery, the number of coulombs passing through the resistor per second is:
A. 0.3
B. 3
C. 4
D. 12
42. The device used for measuring potential difference is known as:
A. Potentiometer
B. Ammeter
C. Galvanometer
D. Voltmeter
43. Keeping the potential difference constant, the resistance of a circuit is doubled. The current will become:
A. Double
B. Half
C. One-fourth
D. Four times
44. The unit for measuring potential difference is:
A. Watt
B. Ohm
C. Volt
D. kWh
45. The resistivity of a certain material is 0.6 Ωm. The material is most likely to be:
A. An insulator
B. A superconductor
C. A conductor
D. A semiconductor
46. The resistance of a wire of length 300 m and cross-section area, 1.0 mm² made of material of resistivity 1.0 x 10⁻⁷ Ω is:
A. 2 Ω
B. 3 Ω
C. 20 Ω
D. 30 Ω
47. The other name of potential difference is:
A. Amphereage
B. Wattage
C. Voltage
D. Potential energy
48. The unit of electrical resistance is:
A. Ampere
B. Volt
C. Coulomb
D. Ohm
49. If the resistance of a certain copper wire is 1Ω, then the resistance of a similar nichrome wire will be about:
A. 25 Ω
B. 30 Ω
C. 60 Ω
D. 45 Ω
50. A car headlight bulb working on a 12 V car battery draws a current of 0.5 A. The resistance of the light bulb is:
A. 0.5 Ω
B. 6 Ω
C. 12 Ω
D. 24 Ω
(a) 30 A
(b) 0.3 A
(c) 0.5 A
(d) 5 A
Answer: (c) 0.5 A
2. An electrical appliance has a resistance of 25 Ω. When this electrical appliance is connected to a 230 V supply line, the current passing through it will be:
(a) 0.92 A
(b) 2.9 A
(c) 9.2 A
(d) 92 A
Answer: (c) 9.2 A
3. When a 4 Ω resistor is connected across the terminals of a 2 V battery, the number of coulombs passing through the resistor per second is:
(a) 0.5
(b) 1
(c) 2
(d) 4
Answer: (a) 0.5
4. Keeping the potential difference constant, the resistance of the circuit is halved. The current will become:
(a) One-fourth
(b) Four times
(c) Half
(d) Double
Answer: (d) Double
5. If in the given arrangement, the three resistors are to be replaced by a single resistor. What will be the value of this resistor?
(a) 4Ω
(b) 6Ω
(c) 9Ω
(d) 18Ω
Answer: (c) 9Ω
6. The potential difference across the 3 Ω resistor in the following diagram is:
(a) 1/9 V
(b) 1/2 V
(c) 2V
(d) 1V
Answer: (d) 1V
7. V1, V2 and V3 are the potential differences across the 1Ω, 2Ω and 3Ω resistors in the following diagram, and the current is 5A.
Which of the following shows the correct values of V1, V2 and V3 measured in volts?
(a) V1 =1, V2 = 2 and V3 = 3
(b) V1 =5, V2 = 10 and V3 = 15
(c) V1 =5, V2 = 2.5 and V3 = 1.6
(d) V1 =4, V2 = 3 and V3 = 2
Answer: (b) V1 =5, V2 = 10 and V3 = 15
8. A wire of resistance R1 is cut into five equal pieces. These five pieces of wire are then connected in parallel. If the resultant resistance of this combination be R2, then the ratio R1/ R2 is:
(a) 1/25
(b) 1/5
(c) 5
(d) 25
Answer: (d) 25
9. Two appliances of rating 200 watt-250 volts and 100 watt-250 volts are joined in series to a 250 volts supply. Total power consumed in the circuit is
(a) 46 watt
(b) 67 watt
(c) 10 watt
(d) 30 watt
Answer: (b) 67 watt
10. When a current 'I' flows through a resistance 'R' for time 't' the electrical energy spent is given by
(a) IRt
(b) I2Rt
(c) IR2t
(d) I2R/t
Answer: (b) I2Rt
11. Two electric bulbs have resistances in the ratio 1:2. If they are joined in series, the energy consumed in them is in the ratio.
(a) 2:1
(b) 1:2
(c) 4:1
(d) 1:1
Answer: (b) 1:2
12. At a given time, a house is supplied with 100 A at 220 V. How many 75 W, 220 V light bulbs could be switched on in the house at the same time (if they are all connected in parallel)?
(a) 93
(b) 193
(c) 293
(d) 393
Answer: (c) 293
13. If the current flowing through a fixed resistor is halved, the heat produced in it will become:
(a) One-fourth
(b) One-half
(c) Double
(d) Four times
Answer: (a) One-fourth
14. You are given four ammeters A, B, C and D having least counts mentioned below:
(I) Ammeter A with least count 0.25 A
(II) Ammeter B with least count 0.5 A
(III) Ammeter C with least count 0.05 A
(IV) Ammeter D with least count 0.1 A
Which of the ammeters would you prefer for doing an experiment to determine the equivalent resistance of two resistances most accurately, when connected in parallel?
(a) Ammeter A
(b) Ammeter B
(c) Ammeter C
(d) Ammeter D
Answer: (c) Ammeter
15. In the given figure, the resistors
(a) 6 Ω, 3 Ω and 9 Ω are in series
(b) 9 Ω and 6 Ω are in parallel and the combination is in series with 3 Ω
(c) 3 Ω, 6 Ω and 9 Ω are in parallel
(d) 3 Ω and 6 Ω are in parallel and the combination is in series with 9 Ω
Answer: (d) 3 Ω and 6 Ω are in parallel and the combination is in series with 9 Ω
