JEE Physics - MCQ Practice Questions

The resistivity of a material depends on:

A wire of resistance 5Ω is bent into a square loop. What is the equivalent resistance between two adjacent corners?

In a Wheatstone bridge at balance, if P = 10Ω, Q = 20Ω, and R = 15Ω, then S equals:

A light bulb rated 60W, 120V is connected to a 120V supply. The resistance of the bulb is:

Two resistors R₁ and R₂ are connected in series with a battery. If R₁ = 2R₂ and the voltage across R₁ is 8V, the voltage across R₂ is:

In a potentiometer experiment, the balancing length for a cell of EMF E is 75 cm. If another cell of EMF E/2 is used, the balancing length would be:

A meter bridge is balanced when the jockey is at 40 cm mark. If the known resistance is 12Ω, the unknown resistance is:

The EMF of a cell is 2V and its internal resistance is 0.5Ω. When connected to external resistance, the terminal voltage is 1.8V. The current in the circuit is:

Three identical cells, each of EMF 1.5V and internal resistance 1Ω, are connected in series. The total EMF and internal resistance are:

A rheostat is used in a circuit to:

When a conductor is heated, its resistance increases because:

A copper wire and an aluminum wire of same length and cross-sectional area carry the same current. Which has greater voltage drop?

In a parallel combination of resistors, the voltage across each resistor is:

A heating element of resistance R is connected to a battery of EMF E and internal resistance r. Maximum power is dissipated in R when:

In a circuit with a battery of 10V and total resistance 5Ω, the power dissipated is:

Two resistors of 4Ω and 6Ω are connected in series with a 10V battery. The current through the circuit and power dissipated are respectively:

In a circuit, if the current increases when voltage increases, the resistance must:

A wire of length L and cross-sectional area A has resistivity ρ. If the wire is stretched to double its length, what will be the new resistance?

Which of the following materials has the lowest temperature coefficient of resistance?

In a Wheatstone bridge, if P/Q = R/S, then the galvanometer shows zero deflection. This condition is called: