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Subject

Physics

Chapter

Ch 2Current Electricity

Weightage~8marksapprox

IntroductionRead →

2.1Electric CurrentRead →

2.2Ohm's LawRead →

2.3Energy and Power in Electrical CircuitsRead →

2.4Electric Cells and BatteriesRead →

2.5Kirchhoff's RulesRead →

2.6Heating Effect of Electric CurrentRead →

2.7Thermoelectric EffectRead →

SUMMARYRead →

CONCEPT MAPRead →

2.8EVALUATION58 Q

ICT CornerRead →

CBSE Sample Papers44 Q

Q1In a given thermocouple, the neutral temperature : (a) is a constant (b) depends on the temperature of cold junction (c) depends upon the temperature of inversion (d) both (b) and (c)Q2The colour code of a carbon resistor is, Brown, Black, Brown and Red. The value of the resistor is : (a) 10 Ω ±5% (b) 1 kΩ ±2% (c) 100 Ω ±2% (d) 10 Ω ±2%Q3State Ohm's law.Q4How much time will 10²⁰ electrons take to flow through a point in a conductor so that the current is 200 mA ? [e = 1.6×10⁻¹⁹ C]Q5State Faraday's laws of electrolysis.Q6What are the characteristics of heating element used in electric heating device ?Q7A galvanometer of resistance 100 Ω which can measure a maximum current of 1 mA is converted into an ohmmeter by connecting a battery of emf 1 V and a fixed resistance of 900 Ω in series with the galvanometer. When an external resistance is measured the current reading is 0.1 mA. Calculate the value of the resistance.Q8Obtain the condition for bridge balance in Wheatstone's bridge.Q9How can e.m.f. of two cells be compared using potentiometer ?Q10Unit of mobility : (a) Cskg (b) m²V⁻¹s⁻¹ (c) Cskg⁻¹ (d) m²V⁻¹s Q11Nichrome wire is used as the heating element because it has : (a) high specific resistance (b) low specific resistance (c) high conductivity (d) low melting point Q12Define electrical resistivity. Write its unit.Q13The resistance of a nichrome wire at 0°C is 10 Ω. If its temperature coefficient of resistance is 0.004/°C, find its resistance at boiling point of water.Q14Compare emf and potential difference.Q15Explain the working of Daniel cell with a neat diagram.Q16An electric bulb is marked 220 V, 100 W. When it is connected across 110 V, its power is : (a) 200 W (b) 173.2 W (c) 50 W (d) 25 W Q17State Ohm's Law.Q18Define Peltier Coefficient.Q19The heat developed across 6 Ω resistor per second is 50 J. Calculate the heat developed per second across 2 Ω resistor in the given electric circuit. [figure: circuit diagram — current I enters a node that splits into two parallel branches between two nodes: one branch has a 2 Ω resistor in series with a 3 Ω resistor, the other branch has a single 6 Ω resistor; the branches rejoin and current I exits, as printed]Q20(a) State Faraday's II law of electrolysis. How is it verified experimentally ? **OR** (b) Explain Raman Scattering of light.Q21The current in the circuit is : [figure: a 15 V battery connected across three 15 Ω resistors, all three resistors in parallel with each other and with the battery] (a) 4 A (b) 1 A (c) 2 A (d) 3 A Q22Explain the conversion of galvanometer into voltmeter.Q23The resistance of a nichrome wire at 0°C is 10 Ω. If its temperature coefficient of resistance is 0.004/°C, find its resistance at boiling point of water. Comment on the result.Q24In India electricity is supplied for domestic use at 220 V. It is supplied at 110 V in USA. If the resistance of a 60 W bulb for use in India is R, the resistance of a 60 W bulb for use in USA will be : (a) R/4 (b) R (c) R/2 (d) 2R Q25If a current of 7.5 A is maintained in a wire for 45 seconds then the charge flowing through the wire is : (a) 6 C (b) 365.5 C (c) 3 C (d) 337.5 C Q26How will you increase the current sensitivity of a galvanometer ?Q27Define electrical resistivity.Q28Obtain a relation between current and drift velocity.Q29There is a current of 1.0 A in the circuit shown below. What is the resistance of P ? [figure: circuit diagram — a 10 V battery connected in a single series loop through a 3 Ω resistor (top branch), a 2.5 Ω resistor (right-side vertical branch), and a resistor labelled P (bottom branch), all in series back to the battery] (a) 3.5 Ω (b) 1.5 Ω (c) 4.5 Ω (d) 2.5 Ω Q30A carbon resistor of (47 ± 4.7) kΩ is to be marked with rings of different colours for its identification. The colour code sequence will be : (a) Violet - Yellow - Orange - Silver (b) Yellow - Green - Violet - Gold (c) Green - Orange - Violet - Gold (d) Yellow - Violet - Orange - Silver Q31If the resistance of coil is 3 Ω at 20°C and α = 0.004/°C then, determine its resistance at 100°C.Q32State Kirchhoff's First and Second Rules.Q33(a) Describe the microscopic model of current and obtain microscopic form of Ohm's Law. **OR** (b) Derive an expression for Radius and Velocity of an electron in the nth orbit using Bohr atom model.Q34A toaster operating at 240 V has resistance of 120 Ω. Its power is : (a) 240 W (b) 400 W (c) 480 W (d) 2 W Q35State the applications of Seebeck Effect.Q36A copper wire of cross-sectional area 0.5 mm² carries a current of 0.2 A. If the free electron density of copper wire is 8.4 × 10²⁸ m⁻³, then compute the drift velocity of free electron.Q37In Joule's heating law, when R and t are constant, if the H is taken along the y-axis and I² along the x-axis, the graph is : (a) circle (b) straight line (c) ellipse (d) parabola Q38A cell supplies a current of 0.9 A through a 2Ω resistor and a current of 0.3 A through a 7Ω resistor. Calculate the internal resistance of the cell.Q39State Kirchhoff's current rule and voltage rule.Q40(a) How the emf of two cells are compared using potentiometer ? **OR** (b) Describe the Fizeau's method to determine the speed of light.Q41Two wires A and B with circular cross section are made up of the same material with equal lengths. Suppose RA = 3RB, then what is the ratio of radius of wire A to that of B ? (a) dfrac1√(3) (b) 3 (c) dfrac13 (d) √(3)Q42State Joule's law of heating.Q43Two resistors when connected in series and parallel, their equivalent resistances are 15 Ω and dfrac5615Ω respectively. Find the values of the resistances.Q44Explain the determination of unknown resistance using meter bridge. **OR** List out the laws of photoelectric effect.

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Ch 2 — Current Electricity

Question 79 of 102

Q. The current in the circuit is : [figure: a 15 V battery connected across three 15 Ω resistors, all three resistors in parallel with each other and with the battery]

(a) 4 A

(b) 1 A

(c) 2 A

(d) 3 A

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←Previous questionQ20 — (a) State Faraday's II law of electrolysis. How is it verified experim…→Next questionQ22 — Explain the conversion of galvanometer into voltmeter.