Electricity

CBSE Class 10 Science · every board question from this chapter, 2025–2025 · 15 of them repeated across years

• In the following experimental setup of electrolysis of water, if P and Q are the gases collected in the test tubes enclosing the…2025asked 2×
• In the electrolysis of water, the mass ratio of hydrogen and oxygen gases liberated at the electrodes is:2025
• A piece of wire of resistance 'R' is cut lengthwise into three identical parts. These parts are then connected in parallel. If…2025asked 3×
• A wire of length ' l ' is gradually stretched so that its length increases to 3 l. If its original resistance is R, then its new…2025asked 2×
• An electric bulb is rated 220 V; 11 W. The resistance of its filament when it glows with a power supply of 220 V is:2025asked 3×
• The minimum number of identical bulbs of rating 4V; 6W, that can work safely with desired brightness, when connected in series…2025asked 3×
• The resistivity of a wire made of an alloy is generally:2025
• An electric bulb is connected to a power supply of 220 V. If the current drawn by the bulb from the supply is 500 mA, the power…2025asked 2×
• Four identical resistors of 12 Ω each are connected in series to form a square ABCD as shown in the figure. The resistance of the…2025asked 3×
• Assertion: The bending of a wire in the form of a coil of several turns does not affect its electrical resistance. Reason (R):…2025
• Assertion: Nichrome is an alloy which is commonly used in electrical heating devices such as electric irons, toasters, etc.…2025asked 2×
• Consider two lamps A and B of rating 50 W; 220 V and 25 W; 220 V respectively. Find the ratio of the resistances of the two lamps…2025
• Determine the maximum and minimum resistance which can be obtained by joining five resistors of 1/5 Ω each. OR Calculate…2025
• Use Ohm's law to determine the potential difference across the 6 Ω resistor in the following circuit when key is closed: OR Prove…2025
• Consider the following circuits: (i) (ii) (iii) In which circuit will the power dissipated in the circuit be (I) minimum (II)…2025
• A wire of resistance R is cut into three equal parts. If these three parts are then joined in parallel, calculate the total…2025
• State two applications of Joule's heating in domestic electric circuit. Establish the relationship between the commercial unit of…2025
• State the role of an electric fuse, used in series with an electrical appliance. Why should in an electric circuit a fuse with…2025
• Four resistors, each of resistance 2 · 0 Ω, are joined end to end to form a square ABCD as shown. Using appropriate formula,…2025
• An electric kettle is rated 750 W; 220 V. Can this kettle be used in a circuit which has a fuse of current rating 3 A? Give…2025
• A voltage source sends a current of 2 A to a resistor of 40 Ω connected across it for 5 minutes. Calculate the electrical energy…2025
• An electric kettle is rated 230 V; 1000 W. Calculate the resistance of its heating element when in operation.2025
• An electric fuse is rated 8 A. Can it be used with an electrical appliance of rating 5 kW, 200 V? Justify your answer.2025
• Define one ampere. The resistance of a wire of 0.01 cm radius is 14 Ω. If the resistivity of the material of the wire is 44 ×…2025
• Define one volt potential difference between two points in an electric field. Draw a schematic diagram of an electric circuit of…2025
• The resistance of a wire of 0.01 cm radius is 7 ohms. If the resistivity of the material of the wire is 44 × 10^-6 ohm meter,…2025asked 3×
• The electrical resistivity of three materials A, B and C at 20°C is given below: (i) Classify these materials as conductor, alloy…2025asked 2×
• Consider the following electric circuit: Calculate the values of the following: The total resistance of the circuit The total…2025asked 3×
• Resistance of a wire of length 1 m is 35 Ω at 20°C. If the diameter of the wire is 0.2 mm, determine the resistivity of the…2025
• Define the term "potential difference" between two points in an electric circuit carrying current. Name and define its S.I. unit.…2025
• Three resistors of 2 Ω, 3 Ω and 6 Ω are connected in (i) series, and (ii) parallel. Draw the arrangements of the resistors and…2025asked 2×
• Write the relationship between resistivity and resistance of a cylindrical conductor of length l and area of cross-section A.…2025
• Explain the statement "Potential difference between two points is 1 volt". What do the symbols given below represent in an…2025asked 3×
• Study the circuit shown in which two resistors X and Y of resistances 3 Ω and 6 Ω respectively are joined in series with a…2025asked 3×
• As shown in the diagram, an electric circuit consisting of an ammeter, a voltmeter, 4 cells of 1 · 5 V each, a plug key with a…2025asked 3×

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