JEE Physics - MCQ Practice Questions

The SI unit of electrical conductivity is:

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

The drift velocity of electrons in a copper wire is approximately:

Two resistances R₁ and R₂ are connected in parallel. If R₁ = 4Ω and R₂ = 6Ω, what is the equivalent resistance?

The color code of a resistor is Brown-Black-Red-Gold. Its resistance value is:

The specific resistance (resistivity) of a conductor depends on:

Three resistors of 2Ω, 3Ω, and 6Ω are connected in parallel. The equivalent resistance is:

The EMF of a cell is 1.5V. When a current of 2A is drawn, the terminal voltage is 1.2V. The internal resistance is:

Two wires of the same material have lengths in ratio 2:3 and diameters in ratio 1:2. Their resistances are in the ratio?

In a Wheatstone bridge, if the four resistances are P, Q, R, and S connected in order, and the galvanometer shows zero deflection, which condition is satisfied?

An ideal ammeter connected in series with a circuit has resistance of:

In carbon resistors, color bands are used for identification. What does the third band represent?

The internal resistance of a Leclanche cell is approximately:

An electric heater rated 500W, 250V is used for 4 hours daily. The energy consumed in one day is:

If the cross-sectional area of a wire is doubled while keeping length and material constant, how does resistivity change?

The temperature coefficient of resistance for a conductor is positive. This means:

In a circuit with pure resistance, the phase difference between voltage and current is:

In a circuit, three resistors of 2Ω, 3Ω, and 6Ω are connected in parallel. The equivalent resistance is:

A battery of EMF 12V and internal resistance 2Ω is connected to an external resistance of 4Ω. The current flowing through the circuit is:

The resistivity of a material depends on: