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Electricity Class 10 MCQs Questions with Answers
Question 1.
Charge on one electron is:
(a) –9.1 × 10-19 C
(b) –1.6 × 10-19 C
(c) +9.1 × 10-19 C
(d) +1.6 × 10-19 C
Answer:
(b) –1.6 × 10-19 C
Question 2.
The current flow in conductor is due to:
(a) free electrons
(b) protons
(c) ions
(d) neutrons
Answer:
(a) free electrons
Question 3.
Unit of resistance is:
(a) Ohm
(b) Ohm/cm
(c) Ohm-cm
(d) Volt
Answer:
(a) Ohm
Question 4.
Two resistors R1 and R2 are connected in parallel, its equivalent resistance will be:
(a) R1 + R2
(b) R1 × R2
(c) \(\frac{R_{1} R_{2}}{R_{1}+R_{2}}\)
(d) \(\frac{R_{1}+R_{2}}{R_{1} R_{2}}\)
Answer:
(c) \(\frac{R_{1} R_{2}}{R_{1}+R_{2}}\)
Question 5.
n conducting wire, each having 4 Ω resistance are connected in parallel. Equivalent resistance of this combination is:
(a) 4 n
(b) \(\frac {4}{n}\)
(c) \(\frac {n}{4}\)
(d) 4 n2
Answer:
(b) 4/n
Question 6.
Ohm’s law is true for:
(a) only metallic conductors
(b) only non-metallic conductors
(c) only semi-conductors
(d) all of these.
Answer:
(a) only metallic conductors
Question 7.
The current of 1.5 A flows through a wire of resistance 1.5 ohm. The potential difference across the wire is:
(a) 22.5 Volt
(b) 2.25 Volt
(c) 1.0 Volt
(d) 0.225 Volt
Answer:
(b) 2.25 Volt
Question 8.
A current of 1.0 ampere is flowing in a conductor. The number of electrons passing per second will be:
(a) 6.25
(b) 6.25 × 10-18
(c) 6.25 × 10-18
(d) 1
Answer:
(c) 6.25 × 10-18
Question 9.
Three resistors, each having resistance R ohm. They are connected from the following four different modes:
According to these above combinations:
(a) maximum resistance will be of combination (iv)
(b) minimum resistance will be of combination (iii)
(c) minimum resistance will be of combination (i)
(d) equivalent resistance of combinations (ii) and (iv) will be same.
Answer:
(b) minimum resistance will be of combination (iii)
Question 10.
The value of current during short circuit:
(a) is zero
(b) is very high
(c) does not change
(d) changes continuously
Answer:
(a) is zero
Question 11.
According to ohm’s law, a graph between voltage and current will be:
(a) a straight line
(b) a circle
(c) a semicircle
(d) a line changing its direction continuosly
Answer:
(c) a semicircle
Question 12.
The amount of electric charge on one proton is:
(a) 1.0 × 10-19 C
(b) 6.25 × 10+19 C
(c) 1.6 × 10+19 C
(d) 1.6 × 10-19 C
Answer:
(d) 1.6 × 10-19 C
Question 13.
The four resistance of 4 ohm are connected in parallel, its equivalent resistance will be:
(a) 4 ohm
(b) 2 ohm
(c) 3 ohm
(d) 1 ohm
Answer:
(d) 1 ohm
Question 14.
In following, which has the unit ampere-second:
(a) electrical energy
(b) electromotive force
(c) charge
(d) electric current.
Answer:
(a) electrical energy
Question 15.
Silicon is a:
(a) conductor
(b) insulator
(c) semi-conductor
(d) none of these
Answer:
(c) semi-conductor
Question 16.
The unit of electric charge is:
(a) joule
(b) coulomb
(c) volt
(d) ampere
Answer:
(b) coulomb
Question 17.
The unit of electric current is:
(a) coulomb
(b) joule
(c) ampere
(d) calorie
Answer:
(c) ampere
Question 18.
Equivalent resistance between points A and B of the following circuit is:
(a) 2.5 Ω
(b) 1.5 Ω
(c) 1.0 Ω
(d) 2.0 Ω
Answer:
(c) 1.0 Ω
Question 19.
The current of 2 A flowed in a conductor at 10 volt p.d. upto 1 minute. The wasted electric energy will be:
(a) 5 joule
(b) 20 joule
(c) 1000 joule
(d) 1200 joule
Answer:
(d) 1200 joule
Question 20.
Which physical quantity has unit ‘kilo-watt-hour’:
(a) time
(b) mass
(c) energy
(d) power
Answer:
(c) energy
Question 21.
Number of joules in 1 kilo-watt-hour will be:
(a) 3600
(b) 36 × 103
(c) 3.6 × 105
(d) 3.6 × 106
Answer:
(d) 3.6 × 106
Question 22.
One kilo watt hour is equal to:
(a) 1.6 × 10-19
(b) 3.6 × 106
(c) 36 × 10-6
(d) 360 × 106
Answer:
(b) 3.6 × 106
Question 23.
Powers of two electric bulbs are 100 W and 200 W. Both are connected from mains of 220 V. The ratio of resistance of their filaments will be:
(a) 1 : 2
(b) 2 : 1
(c) 1 : 4
(d) 4 : 1
Answer:
(b) 2 : 1
Question 24.
An electric bulb is marked ‘12V – 30W’. The current flowing through it will be:
(a) 0.4 A
(b) 2.5 A
(c) 12 A
(d) 360 A
Answer:
(b) 2.5 A
Question 25.
The power of electric heater is 0.5 kilowatt. It is used upto 20 minute. The evolved heat will be:
(a) 2.5 × 10-2 J
(b) 10 J
(c) 4 J
(d) 6.0 × 105 J
Answer:
(d) 6.0 × 105 J
Question 26.
Which is correct value of electrical power?
(a) I2/R
(b) V2R
(c) VI
(d) VIR
Answer:
(c) VI
Question 27.
The value of electric power in terms of current (I) and resistance (R) is:
(a) I/R
(b) IR2
(c) R/I
(d) I2R
Answer:
(d) I2R
Question 28.
Two resistances R1 and R2 are connected with a cell in parallel. If currents flow in resistances are I1 and I2 and heat evolved per second are H1 and H2, then:
(a) \(\frac{H_{1}}{H_{2}}=\frac{R_{2}}{R_{1}}\)
(b) \(\frac{H_{1}}{H_{2}}=\frac{R_{1}}{R_{2}}\)
(c) \(\frac{H_{1}}{H_{2}}=\frac{I_{1}^{2}}{I_{2}^{2}}\)
(d) \(\frac{H_{1}}{H_{2}}=\frac{I_{2}^{2}}{I_{1}^{2}}\)
Answer:
(b) \(\frac{H_{1}}{H_{2}}=\frac{R_{1}}{R_{2}}\)
Question 29.
The wire of electric heater is made of:
(a) Iron
(b) Tungsten
(c) Nichrome
(d) Copper
Answer:
(c) Nichrome
Question 30.
The filament of electric bulb is made of tungsten, because:
(a) its melting point is very high
(b) its melting point is very low
(c) its resistance is negligible
(d) none of these.
Answer:
(a) its melting point is very high
Question 31.
An electric bulb is marked “240 V – 60 W’, its resistance will be:
(a) 1440 Ω
(b) 1920 Ω
(c) 960 Ω
(d) 1200 Ω
Answer:
(c) 960 Ω
Question 32.
Unit of electrical energy is:
(a) volt
(b) watt
(c) ampere
(d) watt-second
Answer:
(d) watt-second
Question 33.
If a bulb of rating 200 V/100 W is used at 100 volt then what will be the power of the bulb ?
(a) 50 W
(b) 25 W
(c) 100 W
(d) 40 W
Answer:
(b) 25 W
Question 34.
A current of 2 ampere flows in a conductor at 10 volt up to 1 minute. The value of consumed electrical energy in a conductor will be:
(a) 5 joule
(b) 10 joule
(c) 20 joule
(d) 1200 joule
Answer:
(d) 1200 joule
Question 35.
A bulb is rated 100 W-250 V. Its resistance is:
(a) 25000 W
(b) 625 W
(c) 25 W
(d) 2.5 W
Answer:
(b) 625 W
Question 36.
The formula for electric power (P) is:
(a) P = \(\frac{V}{I}\)
(b) P = \(\frac{I}{V}\)
(c) P = IV
(d) P = \(\frac{V^{2}}{I}\)
Answer:
(c) P = IV
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