Class 12 Physics MCQ Chapter 3 Current Electricity Solutions English Medium to each chapter is provided in the list so that you can easily browse through different chapters Class 12 Physics MCQ Chapter 3 Current Electricity Question Answer in English and select need one. AHSEC Class 12 Physics Objective Type Question Answer As Per AHSEC New Book Syllabus Download PDF. AHSEC Physics MCQ Class 12 Solutions.
Class 12 Physics MCQ Chapter 3 Current Electricity
Also, you can read the NCERT book online in these sections Solutions by Expert Teachers as per Central Board of Secondary Education (CBSE) Book guidelines. AHSEC Class 12 Physics Multiple Choice Solutions in English Medium are part of All Subject Solutions. Here we have given AHSEC Class 12 Physics MCQ Question Answer English Medium for All Chapters, You can practice these here.
Current Electricity
Chapter: 3
| MCQs |
Choose the correct option:
1. Two cells of the same e.m.f. E but of different internal resistances r1 and r2 are connected in series with an external resistance R. The potential drop across the first cell is found to be zero. The external resistance R is:
(a) r1 + r2
(b) r1 – r2
(c) r2 – r1
(d) r1r2
Ans: (b) r1 – r2
2. Combine three resistors 5 Ω, 4.5 Ω and 3 Ω in such a way that the total resistance of this combination is maximum:
(a) 12.5 Ω
(b) 13.5 Ω
(c) 14.5 Ω
(d) 16.5 Ω
Ans: (a) 12.5 Ω
3. Two of the same metal have the same length but their cross – sectional areas are in the ratio 3:1. They are joined in series. The resistance of the thicker wire is 10 Ω. The total resistance of the combination is:
(a) 5/2 Ω
(b) 40/3 Ω
(c) 100 Ω
(d) 40 Ω
Ans: (d) 40 Ω
4. In parallel combination of n cells, we obtain:
(a) More voltage.
(b) More current.
(c) Less voltage.
(d) Less current.
Ans: (b) More current.
5. A 100 W, 220 V bulb is connected across 110 V supply. The actual power consumed by the bulb will be:
(a) 25 W
(c) 100 W
(b) 50 W
(d) 200 W
Ans: (a) 25 W
6. The resistance of each arm of the Wheat- stone bridge is 10 Ω. A resistance of 10 Ω is connected in series with the galvanometer. Then equivalent resistance across the battery will be:
(α) 20 Ω
(b) 40 Ω
(c) 15 Ω
(d) 10 Ω
Ans: (b) 40 Ω
7. When a metal conductor connected to left gap of a metre bridge is heated, the balancing point:
(a) Shift towards right.
(b) Shifts towards the left.
(c) Remains unchanged.
(d) Remains at zero.
Ans: (a) Shift towards right.
8. The internal resistance of a car battery of e.m.f. 12 V is 5 × 10-2 Ω. It is connected across an unknown resistance. Voltage across the battery when it draws a current of 60 A is:
(a) 15 V
(b) 12 V
(c) 6 V
(d) 9 V
Ans: (d) 9 V
9. There are two electric bulbs of 40 W and 100 W. Which one will be brighter when they are first connected in series and then in parallel?
(a) 100 W both in series and parallel.
(b) 40 W both in series and parallel.
(c) 100 W in series and 40 W in parallel.
(d) 40 W in series and 100 W in parallel.
Ans: (d) 40 W in series and 100 W in parallel.
10. The resistivity of alloy manganin is:
(a) Nearly independent of temperature.
(b) Increases rapidly with increase in temperature.
(c) Decreases with increase in temperature.
(d) Increases rapidly with decrease in temperature.
Ans: (a) Nearly independent of temperature.
11. In a metre bridge the balancing length from the left (standard resistance of 1 Ω is in the right gap) is found to be 20 cm. The value of the unknown resistance is:
(α) 0.8 Ω
(6) 0.5 Ω
(c) 0.25 Ω
(d) 0.4 Ω
Ans: (c) 0.25 Ω
12. What is the number of electrons that constitutes a current of one Ampere?
(a) 2.25 × 1018
(b) 2.25 × 10-18
(c) 6.25 × 1018
(d) 6.25 × 10-18
Ans: (c) 6.25 × 1018
13. At the resistance of a copper wire will become three times its value at 0°C. Temperature coefficient of resistance for copper = 4 × 10-3 per °C:
(a) 400°C
(b) 450°C
(c) 500°C
(d) 550°C
Ans: (d) 550°C
14. Which of these is a correct definition of conventional current?
(a) Current that flows from lower potential to higher potential.
(b) The current which remains static.
(c) Current is constituted by the flow of ions.
(d) Current that flows from higher potential to lower potential.
Ans: (d) Current that flows from higher potential to lower potential.
15. Iron and silicon wires are heated from 30°C to 50°C. The correct statement is that:
(a) Resistance of both the wires increases.
(b) Resistance of both the wires decreases.
(c) Resistance of iron wire increases and that of silicon wire decreases.
(d) Resistance of iron wire decreases and that of silicon wire increases.
Ans: (c) Resistance of iron wire increases and that of silicon wire decreases.
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