10th Physics Chapter 5: Current Electricity

Sr #	Questions	A	B	C	D
1	What are the units of resistance?	Ohm	Ampere	Volt	Watt
2	What is Joule’s law related to electrical energy?	It defines the relationship between electric current and voltage	It describes the production of electric charge by friction	It states that the amount of heat produced in a conductor is proportional to the square of the current passing through it, times its resistance	It defines the SI unit of electrical charge
3	What is the SI unit of electric current?	Volt	Ampere	Ohm	Joule
4	Which of the following materials is an example of a non-Ohmic conductor?	Copper wire	Carbon filament in a light bulb	Silver wire	Aluminum wire
5	What are the characteristics of an Ohmic conductor?	Resistance decreases with increasing current	Resistance is constant over a wide range of voltages	Resistance increases with increasing temperature	Current is inversely proportional to potential difference
6	What safety measure should be taken while working with electrical circuits?	Touching live wires with bare hands	Overloading electrical outlets	Using insulated tools	Working with wet hands
7	Electromotive force (EMF) is defined as:	The force that causes the motion of electrons	The force that opposes the flow of current	The energy supplied per unit charge by a source of electrical energy	The energy dissipated as heat in a circuit
8	What is electric current?	The flow of protons in a circuit	The flow of electrons in a circuit	The potential difference across a circuit	The resistance of a conductor
9	What is potential difference?	The resistance of a conductor	The rate of flow of electric charge	The work done to move a unit charge between two points	The amount of charge stored in a capacitor
10	What is the effect of adding resistors in series on the total resistance of the circuit?	Increases	Decreases	Remains constant	Becomes zero
11	Overloading electrical circuits can lead to:	Increased energy efficiency	Short circuits and electrical fires	Decreased electricity bills	Improved circuit performance
12	What should you do in case of an electrical fire?	Pour water on the fire	Use a fire extinguisher rated for electrical fires	Throw a blanket over the fire	Call an electrician immediately
13	Ohm’s law states that the current flowing through a conductor is:	Inversely proportional to the potential difference across it	Directly proportional to the resistance of the conductor	Directly proportional to the square of the potential difference across it	Directly proportional to the potential difference across it
14	How does the resistance of a conductor change with an increase in its cross-sectional area?	Increases	Decreases	Remains constant	Becomes zero
15	Which of the following is an example of an electrical measuring instrument used to measure electric current in a circuit?	Voltmeter	Ammeter	Galvanometer	Ohmmeter
16	The purpose of the neutral wire in domestic electrical supply is to:	Carry current safely to the load	Provide an earth connection	Provide high voltage	Disconnect the circuit in case of overload
17	In an alternating current (AC) circuit, the direction of the electric current:	Remains constant	Reverses periodically	Fluctuates randomly	Stays in one direction for half the time and then changes
18	Electric power is the rate at which electrical energy is:	Stored in a capacitor	Consumed by a circuit	Dissipated as heat in a circuit	Converted into mechanical energy
19	In a direct current (DC) circuit, the flow of electric charge is:	Always in one direction	Reversed periodically	Alternating between two directions	Non-existent
20	According to Ohm’s law, how does resistance change with an increase in length of a conductor, keeping other factors constant?	Increases	Decreases	Remains constant	Becomes zero
21	What is resistance in an electrical circuit?	The ability of a conductor to store electric charge	The opposition to the flow of electric current	The rate of flow of electrons in a circuit	The potential difference across a circuit
22	Which type of wire is commonly used as the live wire in domestic electrical supply systems?	Red wire	Blue wire	Green wire	Black wire
23	When resistors are connected in parallel, the total resistance is:	Equal to the sum of individual resistances	Less than the resistance of the smallest resistor	Greater than the resistance of the largest resistor	Equal to the product of individual resistances
24	Which of the following statements is true regarding the combination of resistors in parallel?	The total resistance is always greater than the resistance of the largest resistor	The total resistance is always equal to the resistance of the smallest resistor	The total resistance is always less than the resistance of the smallest resistor	The total resistance depends on the values of individual resistors
25	A non-Ohmic conductor typically shows:	Resistance that remains constant over a wide range of conditions	Resistance that decreases with increasing temperature	Current that is directly proportional to potential difference	Resistance that changes with voltage or current
26	What is the total resistance when two resistors of 4 ohms and 6 ohms are connected in parallel?	10 ohms	2 ohms	1.33 ohms	24 ohms
27	Which of the following factors affects the resistance of a conductor?	Length of the conductor	Diameter of the conductor	Temperature of the conductor	All of the above
28	When resistors are connected in series, the total resistance is:	Equal to the sum of individual resistances	Less than the resistance of the smallest resistor	Greater than the resistance of the largest resistor	Equal to the product of individual resistances
29	Which of the following materials exhibits Ohmic behavior over a wide range of conditions?	Copper	Semiconductor	Insulator	Superconductor
30	What is the SI unit of resistance?	Ampere	Volt	Ohm	Joule