Chapter 12 Electricity Class 10 MCQs Questions | NCERT Science Chapter-12 – Edu grown
Question 1. A wire of length /, made of material resistivity ρ is cut into two equal parts. The resistivity of the two parts are equal to,
(a) ρ
(b) (\frac{\rho}{2})
(c) 2 ρ
(d) 4 ρ
Answer/Explanation
Answer: a
Explanation:
(a) Resistivity of the material depends only on the nature of material not dimensions.
- A fuse wire repeatedly gets burnt when used with a good heater. It is advised to use a fuse wire of
(a) more length
(b) less radius
(c) less length
(d) more radius
Answer/Explanation
Answer: d
Explanation:
(d) In order to get the working of heater properly, fused wire of higher rating must be used
- A battery of 10 volt carries 20,000 C of charge through a resistance of 20 Ω. The work done in 10 seconds is
(a) 2 × 103 joule
(b) 2 × 105joule
(c) 2 × 104 joule
(d) 2 × 102 joule
Answer/Explanation
Answer: b
Explanation:
(b) W= qV= 20000 × 10 = 2,00, 000 = 2 × 105 J
- A boy records that 4000 joule of work is required to transfer 10 coulomb of charge between two points of a resistor of 50 Ω. The current passing through it is
(a) 2 A
(b) 4 A
(c) 8 A
(d) 16 A
Answer/Explanation
Answer: c
Explanation:
(c) Work done in transferring the charge
W= qV = qlR …….. (V = IR)
- A cooler of 1500 W, 200 volt and a fan of 500 W, 200 volt are to be used from a household supply. The rating of fuse to be used is
(a) 2.5 A
(b) 5.0 A
(c) 7.5 A
(d) 10 A
Answer/Explanation
Answer: d
Explanation:
(d) Total power used, P = P1 + P1 = 1500 + 500 = 2000 W.
Current drawn from the supply,.
- To get 2 Ω resistance using only 6 Ω resistors, the number of them required is
(a) 2
(b) 3
(c) 4
(d) 6
Answer/Explanation
Answer: b
Explanation:
(b) Three resistors of 2 Ω is required to get 6 Ω because resultant is more than individual so they all must be connected in series.
- The effective resistance between A and b
(a) 4Ω
(b) 6Ω
(c) May be 10 Ω
(d) Must be 10 Ω
Answer/Explanation
Answer: a
Explanation:
(a) 6 Ω is shorted so effective resistance is 4 Ω.
- Two devices are connected between two points say A and B in parallel. The physical quantity that will remain the same between the two points is
(a) current
(b) voltage
(c) resistance
(d) None of these
Answer/Explanation
Answer: b
Explanation:
(b) In parallel combination, voltage remains same across two points.
- The least resistance obtained by using 2 Ω, 4 Ω, 1 Ω and 100 Ω is
a) < 100 Ω (b) < 4 Ω (c) < 1 Ω (d) > 2 Ω
Answer/Explanation
Answer: cExplanation:
(c) In parallel combination, the equivalent resistance is smaller than the least resistance used in the circuit.
- Two wires of same length and area, made of two materials of resistivity ρ1 and ρ2 are connected in parallel V to a source of potential. The equivalent resistivity for the same length and area is
Answer/Explanation
Answer: b
Explanation:
(b) Equivalent resistance in parallel combination is (\frac{1}{R_{P}}=\frac{1}{R_{1}}+\frac{1}{R_{2}})
For the same length and area of cross-section, R ∝ p (resistivity)
11. Calculate the current flows through the 10 Ω resistor in the following circuit.
MCQ Questions for Class 10 Science Electricity with Answers 5
(a) 1.2 A
(b) 0.6 A
(c) 0.2 A
(d) 2.0 A
Answer/Explanation
Answer: b
Explanation:
(b) In parallel, potential difference across each resistor will remain same. So, current through 10 Ω resistor
I = (\frac{V}{R}=\frac{6}{10}) = 0.6 A
- Two resistors are connected in series gives an equivalent resistance of 10 Ω. When connected in parallel, gives 2.4 Ω. Then the individual resistance are
(a) each of 5 Ω
(b) 6 Ω and 4 Ω
(c) 7 Ω and 4 Ω
(d) 8 Ω and 2 Ω
Answer/Explanation
Answer: b
Explanation:
(b) In series, Rs = R1 + R2 = 10 Ω
- If R1 and R2 be the resistance of the filament of 40 W and 60 W respectively operating 220 V, then
(a) R1 < R2
(b) R2 < R1
(c) R1 = R2
(d) R1 ≥ R2
Answer/Explanation
Answer: b
Explanation:
(b) Using power, P = (\frac{V^{2}}{R}) or R = (\frac{V^{2}}{P})
For the same voltage, R ∝ (\frac{1}{P})
More the power, lesser the resistance.
Accordingly, R2 < R1
14. A wire of length /, made of material resistivity ρ is cut into two equal parts. The resistivity of the two parts are equal to,
(a) ρ
(b) (\frac{\rho}{2})
(c) 2 ρ
(d) 4 ρ
Answer/Explanation
Answer: a
Explanation:
(a) Resistivity of the material depends only on the nature of material not dimensions.
15.What is the maximum resistance which can be made using five resistors each of 1/5 W? [NCERT Exemplar Problems]
(a) 1/5 Ω
(b) 10 Ω
(c) 5 Ω
(d) 1 Ω
Answer/Explanation
Answer: d
Explanation:
(d) Series combination provide the maximum resistance
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