Electricity

CBSE Class 10 Science · 125 board questions from this chapter; 124 listed below, 2022–2026

Practice these 125 →

ShareWhatsApp Telegram

In which case/cases will the bulb glow considering that all other connections of electric circuit are complete and working?2026
The correct way to connect an ammeter and a voltmeter in an electric circuit is:2026
A fuse in electric circuit is rated 4 A. Can it be used with an electric heater of rating 2 kW, 200 V? Explain your answer. OR…2026
State the law which gives the relation between the electric current flowing through a given conductor and the potential…2026
The resistance of a wire of 0.01 cm radius and 1.0 cm length is 7 Ω. Calculate its resistivity. OR An electric heater is rated…2026
Define volt, the unit of potential difference. Calculate the work done required to move an electron between two points A and B…2026
What do the symbols given below represent in an electric circuit? Write one function of each.2026
Name a device which is used to: (i) Maintain a constant potential difference in a circuit. (ii) Change the electric current in an…2026
Consider the given electric circuit: Calculate the following: Total resistance of the circuit The electric current drawn from the…2026
Why does an electric bulb become dim when an electric heater in parallel circuit is switched ON? How to connect three resistors…2026
The values of current I flowing in a given resistor for the corresponding values of potential difference V applied across the…2026
State Ohm's law and justify that V - I graph for Ohm's law will always be a straight line passing through the origin. The figure…2026
Read the following passage and answer the questions that follow: Swati, a class 10 student, observes that when she passes close…2026
Three students Shweta, Ayesha and Samridhi were performing an experiment to understand the factors on which the resistance of a…2026
(i) Consider the following electric circuit: Calculate the values of the following: (I) Total resistance of the circuit. (II) The…2026
Study the given electric circuit in which 2 A electric current is flowing between points X and Y. (i) Using the battery, key,…2026
(i) The given electric circuit is a part of an electrical device. Use the information given in the electric circuit diagram to…2026
(i) Derive an expression for the equivalent resistance of three resistors connected in parallel with a battery as shown in…2026
(i) State the rule which gives the direction of force acting on a current carrying conductor placed in a uniform magnetic field.…2026
V-I graph for a nichrome wire is shown in the diagram. (i) Prove that the graph follows Ohm's law and calculate the resistance of…2026
(i) Due to change in length and area of cross-section of a conductor, resistance of conductor changes while resistivity does not…2026
In the following experimental setup of electrolysis of water, if P and Q are the gases collected in the test tubes enclosing the…2025
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…2025
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…2025
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:2025
The minimum number of identical bulbs of rating 4V; 6W, that can work safely with desired brightness, when connected in series…2025
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…2025
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…2025
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.…2025
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: (iii) In which circuit will the power dissipated in the circuit be (I) minimum (II) maximum?…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,…2025
The electrical resistivity of three materials A, B and C at 20°C is given below: (i) Classify these materials as conductor, alloy…2025
Consider the following electric circuit: Calculate the values of the following: The total resistance of the circuit The total…2025
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…2025
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…2025
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…2025
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…2025
Consider the following combinations of resistors: I II III IV The combinations having equivalent resistance 1 Ω is/are:2024
The maximum resistance of a network of five identical resistors of 1/5 Ω each can be -2024
In case of four wires of same material, the resistance will be minimum if the diameter and length of the wire respectively are2024
An electric iron of resistance 20 Ω draws a current of 5 A. The heat developed in the iron in 30 seconds is:2024
S.I. unit of electrical resistivity is2024
In the given circuit the total resistance between X and Y is:2024
The minimum resistance which can be made using five resistors each of resistance 10 Ω is:2024
Study the I-V graph for three resistors of resistances R_1, R_2 and R_3 and select the correct statement from the following:2024
Consider the following combinations of resistors: The combinations having equivalent resistance 1 Ω is/are:2024
Assertion: Electrons move from lower potential to higher potential in a conductor. Reason (R): A dry cell maintains electric…2024
Show how you would connect three resistors each of resistance 6 Ω, so that the combination has a resistance of 9 Ω. Also justify…2024
Use Ohm's law to determine the potential difference across the 3 Ω resistor in the circuit shown in the following diagram when…2024
The filament of an electric lamp draws a current of 0 · 5 A, which lights for 2 hours. Calculate the charge that flows through…2024
An electric source can supply a charge of 500 coulomb. If the current drawn by a device is 25 mA, find the time in which the…2024
An electric source can supply a charge of 750 coulomb. If the current drawn by a device is 15 mA, find the time in which the…2024
Two wires A and B of same material, having same lengths and diameters 0.2 mm and 0.3 mm respectively, are connected one by one in…2024
State Joule's law of heating. How is this effect useful in electric circuits where fuse is used as a safety device?2024
Calculate the resistance of a copper wire of length 1000 m and area of cross-section 2 mm^2. Resistivity of copper is 1 · 6 ×…2024
A 2000 W heater has a resistance of about 25 Ω, whereas a 100 W bulb has a resistance of 500 Ω. When 220 V is applied on these,…2024
Draw a schematic diagram of a circuit consisting of a battery of four dry cells of 1.5 V each, a 2 Ω resistor, a 6 Ω resistor, 16…2024
State Ohm's law. Write formula for the equivalent resistance R_p of the parallel combination of three resistors of values R_1,…2024
(i) Name two safety measures commonly used in electric circuits and appliances. (ii) The power rating of an electric oven is 220…2024
(i) State whether the currents and potential difference in all the bulbs will be same or different when in a circuit three bulbs…2024
(i) Which type of circuits - series or parallel, should be used when you have to operate different electrical gadgets in your…2024
(i) Define electric power. Express it in terms of potential difference (V) and resistance (R). (ii) An electric oven is designed…2024
(i) The potential difference across the two ends of a circuit component is decreased to one-third of its initial value, while its…2024
Study the following circuit: On the basis of this circuit, answer the following questions: Find the value of total resistance…2024
In a domestic circuit five LED bulbs are arranged as shown. The source voltage is 220 V and the power rating of each bulb is…2024
When electric current flows in a purely resistive circuit electrical energy gets fully converted into heat energy. The amount of…2024
If four identical resistors, of resistance 8 ohm, are first connected in series so as to give an effective resistance R_s, and…2023
Two LED bulbs of 12 W and 6 W are connected in series. If the current through 12 W bulb is 0.06 A the current through 6 W bulb…2023
In domestic electric circuits the wiring with 15 A current rating is for the electric devices which have2023
An electric iron of 1500 W, 200 V and a flash light of 500 W, 200 V are used in homes. The rating of fuse to be used should be2023
For verifying Ohm's law, we design an electric circuit diagram in which we show the arrangement of different circuit components.…2023
In a resistive circuit if the current is increased to two times, the percentage change in the amount of heat dissipated in the…2023
An electric kettle consumes 1 kW of electric power when operated at 220 V. The minimum rating of the fuse wire to be used for it…2023
The resistance of a resistor is reduced to half of its initial value. If other parameters of the electrical circuit remain…2023
In the following diagram, the position of the needle is shown on the scale of a voltmeter. The least count of the voltmeter and…2023
If the current I through a resistor is increased by 100\% (at constant temperature), the increase in power dissipated will be2023
Two LED bulbs of 10W and 5W are connected in series. If the current flowing through 5 W bulb is 0.005 A, the current flowing…2023
Write the constituents of solder alloy. Which property of solder makes it suitable for welding electrical wires?2023
Three resistors of 6 Ω, 4 Ω and 4 Ω are connected together so that the total resistance is 8 Ω. Draw a diagram to show this…2023
Let the resistance of an electrical device remain constant, while the potential difference across its two ends decreases to one…2023
V - I graph for two conducting wires A and B are as shown. If both wires are of the same length and same diameter, which of the…2023
There are three resistors of 10 Ω, 20 Ω and 30 Ω joined in parallel in a circuit. The potential difference across the electric…2023
(i) What is meant by resistance of a conductor? Define its SI unit. (ii) List two factors on which the resistance of a…2023
Define electric power and state its SI unit. The commercial unit of electrical energy is known as 'unit'. Write the relation…2023
(i) How is electric current related to the potential difference across the terminals of a conductor? Draw a labelled circuit…2023
An electric iron consumes energy at a rate of 880 W when heating is at the maximum rate and 330 W when the heating is at the…2023
(i) What is meant by resistance of a conductor? Define its SI unit. (ii) List two factors on which the resistance of a…2023
State Ohm's Law. Name and define the physical quantity determined by the slope of V - I curve given in the diagram. Use this…2023
Consider the following electrical circuit diagram in which nine identical resistors of 3 Ω each are connected as shown. If the…2023
An electric heater rated 1100 W operates at 220 V. Calculate (i) its resistance, and (ii) the current drawn by it. OR Calculate…2022
Write the relationship between electrical resistance and electrical resistivity for a metallic conductor of cylindrical shape.…2022
You are provided with a resistor, a key, an ammeter, a voltmeter, four cells of 1.5 V each and few connecting wires. Using these…2022
Calculate the resistance of a metal wire of length 2 m and area of cross-section 1 · 55 × 10^-6 m^2. (Resistivity of the metal is…2022
What is the heating effect of electric current? Write an expression for the amount of heat produced in a resistor when an…2022
In the given circuit determine the value of: (i) total resistance of the circuit (ii) current flowing through the ammeter.2022
For a heater, rated 4 kW and 220 V, calculate the following: The current Energy consumed in 2 hours If 1 kWh is priced at ₹ 4 ·…2022
Three resistors R_1, R_2 and R_3 are connected in parallel and the combination is connected to a battery, an ammeter, a voltmeter…2022
State Ohm's Law. Represent it mathematically. Define 1 ohm. What is the resistance of a conductor through which a current of 0.5…2022
(i) Define Electric Power and write its SI unit. 1/2+1/2 (ii) Two bulbs rated 100 W; 220 V and 60 W; 220 V are connected in…2022
List the factors on which the resistance of a uniform cylindrical conductor of a given material depends. The resistance of a wire…2022
A student wants to use an electric heater, an electric bulb and an electric fan simultaneously. How should these gadgets be…2022
An electric motor rated 1100 W is connected to 220 V mains. Find: (i) The current drawn from the mains, (ii) Electric energy…2022
Study the following electric circuit in which the resistors are arranged in three arms A, B and C: Find the equivalent resistance…2022
Study the following electric circuit in which the resistors are arranged in three arms A, B and C: Find the equivalent resistance…2022
Study the following electric circuit in which the resistors are arranged in three arms A, B and C: Find the equivalent resistance…2022

Answers come from CBSE’s own marking schemes. How we source them.